Zebra Puzzle - IBM Bob and OPL CPLEX
September 3, 2026 · Alex Fleischer
An IBM Bob-assisted OPL/CPLEX CP Optimizer solution by Alex Fleischer (IBM) for the September 2026 Zebra Puzzle challenge.
Articles
Writing on Decision Management — the science, the philosophy, and more. Long-form essays and archived challenge solution documents from practitioners in the community.
260 articles
A Brick Factory — IBM Bob and OPL CPLEX
August 25, 2026 · Alex Fleischer
An IBM Bob-assisted OPL/CPLEX CP Optimizer solution by Alex Fleischer (IBM) for the July 2026 A Brick Factory challenge.
Advanced Website Design: Build the Pareto Frontier Before You Pick the Weights
August 22, 2026 · Adam DeJans Jr.
An exhaustive Pareto-frontier solution to the Advanced Website Design challenge showing that five nondominated cost-value tradeoffs are missed by a simple weighted-sum objective.
Balanced Assignment with Simulated Annealing: When a Heuristic Reaches the Proven Optimum
August 22, 2026 · Adam DeJans Jr.
A pair-swap simulated annealing solution to the 210-person Balanced Assignment challenge that reaches a mathematically derived lower bound of 3,370, turning a heuristic result into a proven global optimum.
Case Assignments: Preserve Option Value Before You Go Greedy
August 22, 2026 · Adam DeJans Jr.
A regret-aware assignment heuristic for the April 2025 Case Assignments challenge, validated against HiGHS and exhaustive enumeration. A locally attractive greedy move consumes the only future option and makes the sequence infeasible.
Solving Change-Making with HiGHS: A Minimal Integer Program
August 22, 2026 · Adam DeJans Jr.
A compact integer linear programming formulation for the generic change-making problem, with the 123-cent example solved to a six-coin optimum by HiGHS.
Solving Doctor Planning with HiGHS: A Binary Shift-Scheduling MILP
August 22, 2026 · Adam DeJans Jr.
A binary shift-scheduling model for the April 2020 Doctor Planning challenge, covering all 21 weekly shifts while respecting availability, night-shift recovery, weekend, and night-limit rules.
Grid of Bulbs: Why the Next Best Action Can Be the Wrong Search Strategy
August 22, 2026 · Adam DeJans Jr.
A validated 280-move constraint-guided depth-first search for the 24×24 Grid of Bulbs instance, contrasted with a greedy next-best-action policy that fails to finish.
Holiday Gift Assignment: Turn the Budget Into a Price
August 22, 2026 · Adam DeJans Jr.
A Lagrangian-relaxation solution to the Holiday Gift Assignment challenge that decomposes the budgeted assignment by person, produces a tight upper bound, and certifies the optimal happiness of 24.
Solving Map Coloring with Violations using HiGHS
August 22, 2026 · Adam DeJans Jr.
A binary MILP for the June 2019 Map Coloring with Violations challenge, using soft-edge penalty variables to prove a minimum violation cost of $257.
Mr Bates vs The Post Office: Use the Metaheuristic to Search, Then Prove the Answer
August 22, 2026 · Adam DeJans Jr.
Differential evolution finds a box with 9,000 cubic inches of volume and only 99.058 inches of strap measure; an independent analytical derivation then proves the continuous optimum.
Solving Rental Boats with HiGHS: A Small Integer Programming Model
August 22, 2026 · Adam DeJans Jr.
A four-variable integer programming solution to the September 2024 Rental Boats challenge, solved to proven optimality with HiGHS.
Solving Smart Investment with HiGHS: Integer Portfolio Allocation
August 22, 2026 · Adam DeJans Jr.
An integer portfolio-allocation model for the July 2024 Smart Investment challenge, with a $4,650 maximum projected one-year gain proven by HiGHS.
The Decision You Can Actually Make
August 22, 2026 · Adam DeJans Jr.
In large organizations, the decision that appears on a slide is often not the decision anyone can actually make. Real decision sets are shaped by timing, ownership, infrastructure, and operational constraints long before an optimizer sees them.
When Simulation Turns a Search Problem Into a Hill Climb
August 21, 2026 · Adam DeJans Jr.
A practical example of using simulation data to discover exploitable structure in a noisy tuning problem, replacing repeated global searches with a much faster local search while preserving most of the value.
Solving A Brick Factory with HiGHS: A Time-Indexed MILP
August 19, 2026 · Adam DeJans Jr.
A compact time-indexed mixed-integer linear programming solution to the July 2026 Brick Factory challenge, solved and verified with HiGHS.
Optimize the Policy, Not the Forecast
August 16, 2026 · Adam DeJans Jr.
When a business outcome is generated by a policy operating under uncertainty, the most useful optimization target is often downstream economic performance rather than upstream forecast accuracy. Simulation makes it practical to tune the policy directly.
What Is a Policy? Just Ask Anyone Buying a Car.
July 1, 2026 · John Brandon Elam
A policy is the rule you built beforehand that tells you what to do when the pressure shows up. The car lot is a better definition than a sentence.
Agentic Medical Services — Aletyx
April 1, 2026 · Alex Porcelli
Aletyx solution by Alex Porcelli (Aletyx) for the Agentic Medical Services challenge.
Agentic Medical Services — DT5GL/SQL/Python
April 1, 2026 · Jack Jansonius
DT5GL/SQL/Python solution by Jack Jansonius for the Agentic Medical Services challenge.
Probabilistic Forecasts Are Modeling Inputs, Not Reporting Artifacts
December 26, 2025 · Adam DeJans Jr.
A probabilistic forecast creates value only when the decision layer can consume the distribution. Collapsing uncertainty to a single number often throws away the asymmetry that drives the economics of the decision.
Inside/Outside Production — OPL/CPLEX
December 1, 2025 · Alex Fleischer
OPL/CPLEX solution by Alex Fleischer (IBM) for the Inside/Outside Production challenge.
Advanced Website Design — JSR-331
November 1, 2025 · Jacob Feldman
JSR-331 solution by Jacob Feldman (OpenRules) for the Advanced Website Design challenge.
Advanced Website Design — OPL/CPLEX
November 1, 2025 · Alex Fleischer
OPL/CPLEX solution by Alex Fleischer (IBM) for the Advanced Website Design challenge.
Advanced Website Design — RuleSolver
November 1, 2025 · Jacob Feldman
RuleSolver solution by Jacob Feldman (OpenRules) for the Advanced Website Design challenge.
Decision with Two Objectives — JSR-331
October 1, 2025 · Jacob Feldman
JSR-331 solution by Jacob Feldman (OpenRules) for the Decision with Two Objectives challenge.
Decision with Two Objectives — Copilot
October 1, 2025 · Jacob Feldman
Copilot solution by Jacob Feldman (OpenRules) for the Decision with Two Objectives challenge.
Decision with Two Objectives — OPL CPLEX
October 1, 2025 · Alex Fleischer
OPL CPLEX solution by Alex Fleischer (IBM) for the Decision with Two Objectives challenge.
Decision with Two Objectives — OpenRules
October 1, 2025 · Alex Mirtsyn
OpenRules solution by Alex Mirtsyn (OpenRules) for the Decision with Two Objectives challenge.
Decision with Two Objectives — Rule Solver
October 1, 2025 · Jacob Feldman
Rule Solver solution by Jacob Feldman (OpenRules) for the Decision with Two Objectives challenge.
Grid Covering — Pen and Paper
August 1, 2025 · Ken Ritley
Pen and Paper solution by Ken Ritley (Bern University of Applied Sciences) for the Grid Covering challenge.
Rules with Regular Expressions — DT5GL/SQL/Python
July 1, 2025 · Jack Jansonius
DT5GL/SQL/Python solution by Jack Jansonius for the Rules with Regular Expressions challenge.
Rules with Regular Expressions — IBM ODM
July 1, 2025 · Andrew Macdonald
IBM ODM solution by Andrew Macdonald (IBM) for the Rules with Regular Expressions challenge.
Rules with Regular Expressions — Progress Corticon
July 1, 2025 · Seth Meldon
Progress Corticon solution by Seth Meldon (Progress) for the Rules with Regular Expressions challenge.
Rules with Regular Expressions — RulesMatix
July 1, 2025 · Baljeet Singh Kandhari
RulesMatix solution by Baljeet Singh Kandhari (RulesMatix) for the Rules with Regular Expressions challenge.
Risky Stocks — OpenRules Decision Manager
May 1, 2025 · Ian Detinich
OpenRules Decision Manager solution by Ian Detinich for the Risky Stocks challenge.
Risky Stocks — watsonx with Mistral
May 1, 2025 · Alex Fleischer
watsonx with Mistral solution by Alex Fleischer (IBM) for the Risky Stocks challenge.
Case Assignments — DT5GL/SQL
April 1, 2025 · Jack Jansonius
DT5GL/SQL solution by Jack Jansonius for the Case Assignments challenge.
Case Assignments — OPL CPLEX
April 1, 2025 · Alex Fleischer
OPL CPLEX solution by Alex Fleischer (IBM) for the Case Assignments challenge.
Mr Bates vs The Post Office — Copilot + JavaSolver
February 1, 2025 · Jacob Feldman
Copilot + JavaSolver solution by Jacob Feldman (OpenRules) for the Mr Bates vs The Post Office challenge.
Mr Bates vs The Post Office — OpenRules RuleSolver
February 1, 2025 · Jacob Feldman
OpenRules RuleSolver solution by Jacob Feldman (OpenRules) for the Mr Bates vs The Post Office challenge.
Mr Bates vs The Post Office — OPL/CPLEX
February 1, 2025 · Alex Fleischer
OPL/CPLEX solution by Alex Fleischer (IBM) for the Mr Bates vs The Post Office challenge.
Christmas Word Search — CPLEX/OPL
January 1, 2025 · Alex Fleischer
CPLEX/OPL solution by Alex Fleischer (IBM) for the Christmas Word Search challenge.
Christmas Word Search — Copilot
January 1, 2025 · Jacob Feldman
Copilot solution by Jacob Feldman (OpenRules) for the Christmas Word Search challenge.
Christmas Word Search — DT5GL/Python
January 1, 2025 · Jack Jansonius
DT5GL/Python solution by Jack Jansonius for the Christmas Word Search challenge.
Christmas Word Search — Llama/watsonx
January 1, 2025 · Alex Fleischer
Llama/watsonx solution by Alex Fleischer (IBM) for the Christmas Word Search challenge.
Pricing Policy — ChatGPT/DMN
December 1, 2024 · Jacob Feldman
ChatGPT/DMN solution by Jacob Feldman (OpenRules) for the Pricing Policy challenge.
Pricing Policy — ChatGPT/Python
December 1, 2024 · Jack Jansonius
ChatGPT/Python solution by Jack Jansonius for the Pricing Policy challenge.
Pricing Policy — DT5GL/SQL
December 1, 2024 · Jack Jansonius
DT5GL/SQL solution by Jack Jansonius for the Pricing Policy challenge.
Pricing Policy — OpenRules
December 1, 2024 · Alex Mirtsyn
OpenRules solution by Alex Mirtsyn (OpenRules) for the Pricing Policy challenge.
Cheryl's Birthday — CPLEX
October 1, 2024 · Alex Fleischer
CPLEX solution by Alex Fleischer (IBM) for the Cheryl's Birthday challenge.
Rental Boats — Copilot
September 1, 2024 · Jacob Feldman
Copilot solution by Jacob Feldman (OpenRules) for the Rental Boats challenge.
Rental Boats — CPLEX/Java
September 1, 2024 · Guillaume Chagneau
CPLEX/Java solution by Guillaume Chagneau for the Rental Boats challenge.
Rental Boats — Llama/CPLEX
September 1, 2024 · Alex Fleischer
Llama/CPLEX solution by Alex Fleischer (IBM) for the Rental Boats challenge.
Rental Boats — OPL/CPLEX
September 1, 2024 · Alex Fleischer
OPL/CPLEX solution by Alex Fleischer (IBM) for the Rental Boats challenge.
Rental Boats — OpenRules/RuleSolver
September 1, 2024 · Ian Detinich
OpenRules/RuleSolver solution by Ian Detinich for the Rental Boats challenge.
Rental Boats — Excel Solver
September 1, 2024 · Guillaume Chagneau
Excel Solver solution by Guillaume Chagneau for the Rental Boats challenge.
Smart Investment — ChatGPT/ZIMPL
July 1, 2024 · Rob Parker
ChatGPT/ZIMPL solution by Rob Parker for the Smart Investment challenge.
Smart Investment — Excel Solver
July 1, 2024 · Ian Detinich
Excel Solver solution by Ian Detinich for the Smart Investment challenge.
Smart Investment — Llama3/CPLEX/watsonx
July 1, 2024 · Alex Fleischer
Llama3/CPLEX/watsonx solution by Alex Fleischer (IBM) for the Smart Investment challenge.
Smart Investment — OpenRules RuleSolver
July 1, 2024 · Ian Detinich
OpenRules RuleSolver solution by Ian Detinich for the Smart Investment challenge.
Smart Investment — OPL/CPLEX
July 1, 2024 · Alex Fleischer
OPL/CPLEX solution by Alex Fleischer (IBM) for the Smart Investment challenge.
Smart Investment — Progress Corticon
July 1, 2024 · Seth Meldon
Progress Corticon solution by Seth Meldon (Progress) for the Smart Investment challenge.
Stable Marriage Problem — OpenRules RuleSolver (no Java)
June 1, 2024 · Jacob Feldman
OpenRules RuleSolver (no Java) solution by Jacob Feldman (OpenRules) for the Stable Marriage Problem challenge.
Stable Marriage Problem — OpenRules RuleSolver (with Java)
June 1, 2024 · Jacob Feldman
OpenRules RuleSolver (with Java) solution by Jacob Feldman (OpenRules) for the Stable Marriage Problem challenge.
Stable Marriage Problem — OPL/CPLEX
June 1, 2024 · Alex Fleischer
OPL/CPLEX solution by Alex Fleischer (IBM) for the Stable Marriage Problem challenge.
Stable Marriage Problem — watsonx
June 1, 2024 · Alex Fleischer
watsonx solution by Alex Fleischer (IBM) for the Stable Marriage Problem challenge.
Lookup Tables in Decision Models — DT5GL
April 1, 2024 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Lookup Tables in Decision Models challenge.
Lookup Tables in Decision Models — OpenRules
April 1, 2024 · Jacob Feldman
OpenRules solution by Jacob Feldman (OpenRules) for the Lookup Tables in Decision Models challenge.
Analyzing Employees — ChatGPT/Python
March 1, 2024 · Jack Jansonius
ChatGPT/Python solution by Jack Jansonius for the Analyzing Employees challenge.
Analyzing Employees — Corticon
March 1, 2024 · Seth Meldon
Corticon solution by Seth Meldon (Progress) for the Analyzing Employees challenge.
Analyzing Employees — OPL
March 1, 2024 · Alex Fleischer
OPL solution by Alex Fleischer (IBM) for the Analyzing Employees challenge.
Analyzing Employees — Python/DT5GL
March 1, 2024 · Jack Jansonius
Python/DT5GL solution by Jack Jansonius for the Analyzing Employees challenge.
Family Riddle — ChatGPT/CPLEX
January 1, 2024 · Alex Fleischer
ChatGPT/CPLEX solution by Alex Fleischer (IBM) for the Family Riddle challenge.
Family Riddle — MS Copilot
January 1, 2024 · Microsoft Copilot
MS Copilot solution by Microsoft Copilot for the Family Riddle challenge.
Family Riddle — OPL/CPLEX
January 1, 2024 · Alex Fleischer
OPL/CPLEX solution by Alex Fleischer (IBM) for the Family Riddle challenge.
Coins — MiniZinc
October 1, 2023 · Florian Sikora
MiniZinc solution by Florian Sikora for the Coins challenge.
Soldier Payment Rules — DT5GL with SQL (revised)
August 1, 2023 · Jack Jansonius
DT5GL with SQL (revised) solution by Jack Jansonius for the Soldier Payment Rules challenge.
Soldier Payment Rules — DT5GL with SQL
August 1, 2023 · Jack Jansonius
DT5GL with SQL solution by Jack Jansonius for the Soldier Payment Rules challenge.
Soldier Payment Rules — OpenRules Decision Manager
August 1, 2023 · Alex Mirtsyn
OpenRules Decision Manager solution by Alex Mirtsyn (OpenRules) for the Soldier Payment Rules challenge.
Rules as Preferences (Miss Manners Advanced) — IBM OPL
July 1, 2023 · Alex Fleischer
IBM OPL solution by Alex Fleischer (IBM) for the Rules as Preferences (Miss Manners Advanced) challenge.
Rules as Preferences (Miss Manners Advanced) — OptaPlanner
July 1, 2023 · Thierry Guerin
OptaPlanner solution by Thierry Guerin (Groupe Onepoint) for the Rules as Preferences (Miss Manners Advanced) challenge.
Miss Manners — OpenRules with Java Solver
June 1, 2023 · Jacob Feldman
OpenRules with Java Solver solution by Jacob Feldman (OpenRules) for the Miss Manners challenge.
Miss Manners — CPLEX
June 1, 2023 · Alex Fleischer
CPLEX solution by Alex Fleischer (IBM) for the Miss Manners challenge.
Grid of Bulbs — OPL/CPLEX
May 1, 2023 · Alex Fleischer
OPL/CPLEX solution by Alex Fleischer (IBM) for the Grid of Bulbs challenge.
Grid of Bulbs — Python
May 1, 2023 · Julien Pradier
Python solution by Julien Pradier (IBM) for the Grid of Bulbs challenge.
Permit Eligibility — ChatGPT and Java
March 1, 2023 · Jacob Feldman
ChatGPT and Java solution by Jacob Feldman (OpenRules) for the Permit Eligibility challenge.
Permit Eligibility — ChatGPT
March 1, 2023 · ChatGPT
ChatGPT solution by ChatGPT for the Permit Eligibility challenge.
Permit Eligibility — DT5GL
March 1, 2023 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Permit Eligibility challenge.
Permit Eligibility — Oracle
March 1, 2023 · Charlotte Bouvy & Martijn Tromm
Oracle solution by Charlotte Bouvy & Martijn Tromm (Rabobank) for the Permit Eligibility challenge.
Permit Eligibility — Scala
March 1, 2023 · Alex Goldin
Scala solution by Alex Goldin (OpenRules) for the Permit Eligibility challenge.
Holiday Gift Assignment — DT5GL
January 1, 2023 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Holiday Gift Assignment challenge.
Holiday Gift Assignment — OPL/CPLEX
January 1, 2023 · Alex Fleischer
OPL/CPLEX solution by Alex Fleischer (IBM) for the Holiday Gift Assignment challenge.
Holiday Gift Assignment — Picat
January 1, 2023 · Hakan Kjellerstrand
Picat solution by Hakan Kjellerstrand for the Holiday Gift Assignment challenge.
Crack Padlock Code — DT5GL
November 1, 2022 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Crack Padlock Code challenge.
Crack Padlock Code — IBM ODM
November 1, 2022 · Andrew Macdonald
IBM ODM solution by Andrew Macdonald for the Crack Padlock Code challenge.
Crack Padlock Code — Python
November 1, 2022 · Evan Semet
Python solution by Evan Semet for the Crack Padlock Code challenge.
Crack Padlock Code — OPL CPLEX
November 1, 2022 · Alex Fleischer
OPL CPLEX solution by Alex Fleischer (IBM) for the Crack Padlock Code challenge.
Evaluate Team Performance — DT5GL V1
July 1, 2022 · Jack Jansonius
DT5GL V1 solution by Jack Jansonius for the Evaluate Team Performance challenge.
Evaluate Team Performance — DT5GL V2 (finds players with the highest overall performance)
July 1, 2022 · Jack Jansonius
DT5GL V2 (finds players with the highest overall performance) solution by Jack Jansonius for the Evaluate Team Performance challenge.
Evaluate Team Performance — DT5GL V3
July 1, 2022 · Jack Jansonius
DT5GL V3 solution by Jack Jansonius for the Evaluate Team Performance challenge.
Evaluate Team Performance — Executable English
July 1, 2022 · Adrian Walker
Executable English solution by Adrian Walker for the Evaluate Team Performance challenge.
Evaluate Team Performance — IBM ODM
July 1, 2022 · Andrew Macdonald
IBM ODM solution by Andrew Macdonald for the Evaluate Team Performance challenge.
Evaluate Team Performance — Innovator
July 1, 2022 · Wilfried Kurth
Innovator solution by Kurth Wilfried (AXA) for the Evaluate Team Performance challenge.
Evaluate Team Performance — Progress Corticon
July 1, 2022 · Seth Meldon
Progress Corticon solution by Seth Meldon (Progress Corticon) for the Evaluate Team Performance challenge.
Medical Claim Processing — Java
May 1, 2022 · Bob Moore
Java solution by Dr. Bob Moore for the Medical Claim Processing challenge.
Medical Claim Processing — DT5GL
May 1, 2022 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Medical Claim Processing challenge.
Card Approval Decision — Camunda
October 1, 2021 · Vedavyas Etikala
Camunda solution by Vedavyas Etikala for the Card Approval Decision challenge.
Titanic Booking Service — s(CASP)
August 1, 2021 · Gopal Gupta
s(CASP) solution by Gopal Gupta for the Titanic Booking Service challenge.
Titanic Booking Service — Scikit-Learn
August 1, 2021 · Bob Moore
Scikit-Learn solution by Dr. Bob Moore for the Titanic Booking Service challenge.
Where is Gold? — Common Sense
June 1, 2021 · Eric Manalac
Common Sense solution by Eric Manalac for the Where is Gold? challenge.
Where is Gold? — Decision Tables
June 1, 2021 · Jan Vanthienen
Decision Tables solution by Jan Vanthienen (KU Leuven) for the Where is Gold? challenge.
Where is Gold? — DT5GL
June 1, 2021 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Where is Gold? challenge.
Where is Gold? — GAMS
June 1, 2021 · Alireza Soroudi
GAMS solution by Alireza Soroudi for the Where is Gold? challenge.
Where is Gold? — IBM CPLEX
June 1, 2021 · Alex Fleischer
IBM CPLEX solution by Alex Fleischer (IBM) for the Where is Gold? challenge.
Where is Gold? — IBM ODM
June 1, 2021 · Andrew Macdonald
IBM ODM solution by Andrew Macdonald for the Where is Gold? challenge.
Where is Gold? — JSR331
June 1, 2021 · Jacob Feldman
JSR331 solution by Jacob Feldman (OpenRules) for the Where is Gold? challenge.
Where is Gold? — MiniZinc
June 1, 2021 · James Delonay
MiniZinc solution by James Delonay for the Where is Gold? challenge.
Where is Gold? — Pyomo
June 1, 2021 · Alireza Soroudi
Pyomo solution by Alireza Soroudi for the Where is Gold? challenge.
Where is Gold? — Scala
June 1, 2021 · I. Khlystov
Scala solution by I. Khlystov for the Where is Gold? challenge.
COVID-19 Testing — DT5GL
May 1, 2021 · Jack Jansonius
DT5GL solution by Jack Jansonius for the COVID-19 Testing challenge.
Rate Loan Risk Category — DT5GL
April 1, 2021 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Rate Loan Risk Category challenge.
Benchmark "Medical Services" — Camunda
February 1, 2021 · Rob Parker
Camunda solution by Rob Parker for the Benchmark "Medical Services" challenge.
Benchmark "Medical Services" — Corticon
February 1, 2021 · Seth Meldon
Corticon solution by Seth Meldon (Progress Corticon) for the Benchmark "Medical Services" challenge.
Benchmark "Medical Services" — Java
February 1, 2021 · Pradeep Venkat
Java solution by Pradeep Venkat for the Benchmark "Medical Services" challenge.
Benchmark "Medical Services" — Java (custom HashMap engine)
February 1, 2021 · Bob Moore
Java (custom HashMap engine) solution by Dr. Bob Moore for the Benchmark "Medical Services" challenge.
Virtual Chess Tournament — Gurobi
December 1, 2020 · Bernhard C. Schrenk
Gurobi solution by Bernhard C. Schrenk for the Virtual Chess Tournament challenge.
Virtual Chess Tournament — MiniZinc
December 1, 2020 · Florian Sikora
MiniZinc solution by Florian Sikora for the Virtual Chess Tournament challenge.
Virtual Chess Tournament — OPL
December 1, 2020 · Alex Fleischer
OPL solution by Alex Fleischer (IBM) for the Virtual Chess Tournament challenge.
Virtual Chess Tournament — Python
December 1, 2020 · Emmanuel Lazard
Python solution by Emmanuel Lazard for the Virtual Chess Tournament challenge.
Calculator with Two Buttons — MiniZinc
November 1, 2020 · James Delonay
MiniZinc solution by James Delonay for the Calculator with Two Buttons challenge.
Calculator with Two Buttons — No tools
November 1, 2020 · Boro Vujosevic
No tools solution by Boro Vujosevic for the Calculator with Two Buttons challenge.
Calculator with Two Buttons — OPL CPLEX
November 1, 2020 · Alex Fleischer
OPL CPLEX solution by Alex Fleischer (IBM) for the Calculator with Two Buttons challenge.
Compressing Decision Tables — Alternative Heuristics
September 1, 2020 · Bob Moore
Alternative Heuristics solution by Dr. Bob Moore for the Compressing Decision Tables challenge.
Compressing Decision Tables — DT5GL
September 1, 2020 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Compressing Decision Tables challenge.
Pay-As-You-Go Pricing — DT5GL
May 1, 2020 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Pay-As-You-Go Pricing challenge.
Pay-As-You-Go Pricing — Excel/Python
May 1, 2020 · Bob Moore
Excel/Python solution by Dr. Bob Moore for the Pay-As-You-Go Pricing challenge.
Pay-As-You-Go Pricing — Relational Rule Base
May 1, 2020 · Leonid Nisenboym
Relational Rule Base solution by Leonid Nisenboym for the Pay-As-You-Go Pricing challenge.
Pay-As-You-Go Pricing — Rulesmatix
May 1, 2020 · Baljeet Singh Kandhari
Rulesmatix solution by Baljeet Singh (Rulesmatix) for the Pay-As-You-Go Pricing challenge.
Doctor Planning — OPL
April 1, 2020 · Alex Fleischer
OPL solution by Alex Fleischer (IBM) for the Doctor Planning challenge.
Doctor Planning — ZIMPL
April 1, 2020 · Rob Parker
ZIMPL solution by Rob Parker for the Doctor Planning challenge.
Paid Sick Leave Requirements — Behavioral Rules
March 1, 2020 · Ronald G. Ross
Behavioral Rules solution by Ronald G. Ross (Business Rule Solutions) for the Paid Sick Leave Requirements challenge.
NIM Rules — IBM OPL
January 1, 2020 · Alex Fleischer
IBM OPL solution by Alex Fleischer (IBM) for the NIM Rules challenge.
NIM Rules — Machine Learning Approach with Python
January 1, 2020 · Bob Moore
Machine Learning Approach with Python solution by Dr. Bob Moore for the NIM Rules challenge.
Crack the Code — IBM CPLEX
September 1, 2019 · Alex Fleischer
IBM CPLEX solution by Alex Fleischer for the Crack the Code challenge.
Crack the Code — MiniZinc
September 1, 2019 · James Delonay
MiniZinc solution by James Delonay for the Crack the Code challenge.
Crack the Code — Python
September 1, 2019 · Jack Jansonius
Python solution by Jack Jansonius for the Crack the Code challenge.
Map Coloring with Violations — OPL CPLEX
June 1, 2019 · Alex Fleischer
OPL CPLEX solution by Alex Fleischer for the Map Coloring with Violations challenge.
Map Coloring with Violations — SQL
June 1, 2019 · Damir Sudarevic
SQL solution by Damir Sudarevic for the Map Coloring with Violations challenge.
Map Coloring — DMN
May 1, 2019 · Thierry Guerin
DMN solution by Thierry Guerin for the Map Coloring challenge.
Map Coloring — Java
May 1, 2019 · Alex Goldin
Java solution by Alex Goldin for the Map Coloring challenge.
Map Coloring — SQL
May 1, 2019 · Damir Sudarevic
SQL solution by Damir Sudarevic for the Map Coloring challenge.
Recreational Fee — Camunda
April 1, 2019 · Bob Moore
Camunda solution by Dr. Bob Moore for the Recreational Fee challenge.
Recreational Fee — DMN DRD
April 1, 2019 · Gary Hallmark
DMN DRD solution by Gary Hallmark for the Recreational Fee challenge.
Recreational Fee — DMN DRD
April 1, 2019 · Martin de Villiers
DMN DRD solution by Martin de Villiers for the Recreational Fee challenge.
Recreational Fee — DT5GL
April 1, 2019 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Recreational Fee challenge.
Offering Donated Organs for Transplant — BPMN/Trisotech
March 1, 2019 · Denis Gagne
BPMN/Trisotech solution by Denis Gagné for the Offering Donated Organs for Transplant challenge.
Offering Donated Organs for Transplant — Drools
March 1, 2019 · Bob Moore
Drools solution by Dr. Bob Moore for the Offering Donated Organs for Transplant challenge.
Offering Donated Organs for Transplant — DT5GL
March 1, 2019 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Offering Donated Organs for Transplant challenge.
Offering Donated Organs for Transplant — RuleSpeak/SBVR
March 1, 2019 · Ronald G. Ross
RuleSpeak/SBVR solution by Ronald G. Ross for the Offering Donated Organs for Transplant challenge.
Identify Unfriendly Robots — No tools
January 1, 2019 · Vlad Silverman
No tools solution by Vlad Silverman for the Identify Unfriendly Robots challenge.
Identify Unfriendly Robots — Python ML Packages
January 1, 2019 · Bob Moore
Python ML Packages solution by Bob Moore for the Identify Unfriendly Robots challenge.
Vacation Days Advanced — DT5GL
November 1, 2018 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Vacation Days Advanced challenge.
Vacation Days Advanced — OpenRules with JSR331
November 1, 2018 · Jacob Feldman
OpenRules with JSR331 solution by Jacob Feldman for the Vacation Days Advanced challenge.
Vacation Days Advanced — Blaze Advisor
November 1, 2018 · Bob Moore
Blaze Advisor solution by Bob Moore for the Vacation Days Advanced challenge.
Balanced Assignment — CP Optimizer
September 1, 2018 · Philippe Laborie
CP Optimizer solution by Philippe Laborie for the Balanced Assignment challenge.
Balanced Assignment — OPL
September 1, 2018 · Alex Fleischer
OPL solution by Alex Fleischer for the Balanced Assignment challenge.
Zoo, Buses, and Kids — SQL
July 1, 2018 · Damir Sudarevic
SQL solution by Damir Sudarevic for the Zoo, Buses, and Kids challenge.
Credit Card Application — Corticon
June 1, 2018 · Mike Parish
Corticon solution by Mike Parish for the Credit Card Application challenge.
Credit Card Application — DT5GL
June 1, 2018 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Credit Card Application challenge.
Credit Card Application — DMN with Trisotech
June 1, 2018 · Bruce Silver
DMN with Trisotech solution by Bruce Silver for the Credit Card Application challenge.
Up-Selling Rules — Corticon
April 1, 2018 · Mike Parish
Corticon solution by Mike Parish for the Up-Selling Rules challenge.
Up-Selling Rules — DT5GL
April 1, 2018 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Up-Selling Rules challenge.
Tax Decision Table — Corticon
February 1, 2018 · Mike Parish
Corticon solution by Mike Parish for the Tax Decision Table challenge.
Tax Decision Table — Camunda
February 1, 2018 · Bob Moore
Camunda solution by Bob Moore for the Tax Decision Table challenge.
Tax Decision Table — DT5GL
February 1, 2018 · Jack Jansonius
DT5GL solution by Jack Jansonius for the Tax Decision Table challenge.
Tax Decision Table — Trisotech/RapidGen
February 1, 2018 · Jan Purchase
Trisotech/RapidGen solution by Jan Purchase for the Tax Decision Table challenge.
Order Promotions — Corticon
January 1, 2018 · Mike Parish
Corticon solution by Mike Parish for the Order Promotions challenge.
Order Promotions — DMN FEEL
January 1, 2018 · Bruce Silver
DMN FEEL solution by Bruce Silver for the Order Promotions challenge.
Order Promotions — Drools/Java
January 1, 2018 · Bob Moore
Drools/Java solution by Bob Moore for the Order Promotions challenge.
Reindeer Ordering — Camunda/Groovy
December 1, 2017 · Rob Parker
Camunda/Groovy solution by Robert Parker for the Reindeer Ordering challenge.
Reindeer Ordering — Corticon
December 1, 2017 · Mike Parish
Corticon solution by Mike Parish for the Reindeer Ordering challenge.
Reindeer Ordering — Corticon Alternative
December 1, 2017 · Mike Parish
Corticon Alternative solution by Mike Parish for the Reindeer Ordering challenge.
Reindeer Ordering — Drools/Java
December 1, 2017 · Bob Moore
Drools/Java solution by Bob Moore for the Reindeer Ordering challenge.
Reindeer Ordering — Python
December 1, 2017 · Bob Moore
Python solution by Bob Moore for the Reindeer Ordering challenge.
Reindeer Ordering — ZIMPL/LPSolve
December 1, 2017 · Rob Parker
ZIMPL/LPSolve solution by Robert Parker for the Reindeer Ordering challenge.
Soldier Payment Rules — Corticon
November 1, 2017 · Mike Parish
Corticon solution by Michael Parish for the Soldier Payment Rules challenge.
Soldier Payment Rules — SQL
November 1, 2017 · Bob Moore
SQL solution by Dr. Bob Moore for the Soldier Payment Rules challenge.
Classify Department Employees — Corticon
September 1, 2017 · Mike Parish
Corticon solution by Mike Parish for the Classify Department Employees challenge.
Classify Department Employees — DMN with Trisotech/Drools
September 1, 2017 · Bruce Silver
DMN with Trisotech/Drools solution by Bruce Silver for the Classify Department Employees challenge.
Loan Origination (DMN Chapter 11 Example) — Blueriq
June 1, 2017 · Maarten Schadd
Blueriq solution by Maarten Schadd for the Loan Origination (DMN Chapter 11 Example) challenge.
Loan Origination (DMN Chapter 11 Example) — Corticon
June 1, 2017 · Mike Parish
Corticon solution by Mike Parish for the Loan Origination (DMN Chapter 11 Example) challenge.
Loan Origination (DMN Chapter 11 Example) — Sapiens
June 1, 2017 · Gil Ronen
Sapiens solution by Gil Ronen for the Loan Origination (DMN Chapter 11 Example) challenge.
Loan Origination (DMN Chapter 11 Example) — Trisotech
June 1, 2017 · Denis Gagne
Trisotech solution by Denis Gagné for the Loan Origination (DMN Chapter 11 Example) challenge.
Loan Origination (DMN Chapter 11 Example) — DT5GL
June 1, 2017 · Jack Jansonius
DT5GL solution by J Jansonius for the Loan Origination (DMN Chapter 11 Example) challenge.
Online Dating Services — Corticon
March 1, 2017 · Mike Parish
Corticon solution by Mike Parish for the Online Dating Services challenge.
Online Dating Services — Executable English
March 1, 2017 · Adrian Walker
Executable English solution by Adrian Walker (Reengineering LLC) for the Online Dating Services challenge.
Online Dating Services — InteliOps
March 1, 2017 · Vijay Bandekar
InteliOps solution by Dr. Vijay Bandekar for the Online Dating Services challenge.
Determine Booking Fraud — Corticon
February 1, 2017 · Mike Parish
Corticon solution by Mike Parish for the Determine Booking Fraud challenge.
Determine Booking Fraud — Oracle DMN
February 1, 2017 · Arun Pareek
Oracle DMN solution by Arun Pareek (Rubicon Red) for the Determine Booking Fraud challenge.
Rebooking Passengers from Cancelled Flights — Corticon
October 1, 2016 · Mike Parish
Corticon solution by Michael Parish (Progress Software) for the Rebooking Passengers from Cancelled Flights challenge.
Rebooking Passengers from Cancelled Flights — DMN
October 1, 2016 · Bruce Silver
DMN solution by Bruce Silver (Method & Style) for the Rebooking Passengers from Cancelled Flights challenge.
Rebooking Passengers from Cancelled Flights — DT5GL with SQL
October 1, 2016 · Jack Jansonius
DT5GL with SQL solution by Jack Jansonius for the Rebooking Passengers from Cancelled Flights challenge.
Rebooking Passengers from Cancelled Flights — Model-based optimal solution
October 1, 2016 · Jacob Feldman
Model-based optimal solution solution by Jacob Feldman (OpenRules) for the Rebooking Passengers from Cancelled Flights challenge.
Greeting a Customer with Unknown Data — OpenRules
August 1, 2016 · Jacob Feldman
OpenRules solution by Jacob Feldman (OpenRules) for the Greeting a Customer with Unknown Data challenge.
Advanced Decision Analytics via Deep Reasoning on Diverse Data
July 8, 2016 · Benjamin Grosof
Benjamin Grosof's DecisionCAMP 2016 presentation on deep reasoning for advanced decision analytics.
Decision Management at the Speed of Events
July 8, 2016 · Dan Selman
Dan Selman's DecisionCAMP 2016 presentation on rules, events, entities, and analytics.
DMN as a Decision Modeling Language
July 8, 2016 · Bruce Silver
Bruce Silver's DecisionCAMP 2016 keynote on DMN as a decision modeling language.
DMN: How to Satisfy Multiple Objectives?
July 8, 2016 · Jan Vanthienen
Jan Vanthienen's DecisionCAMP 2016 presentation on multiple objectives in DMN.
Factors Affecting Rule Performance
July 8, 2016 · Charles Forgy
Charles Forgy's DecisionCAMP 2016 presentation on rule performance.
Using Machine Learning, Business Rules, and Optimization for Flash Sale Pricing
July 8, 2016 · Igor Elbert and Jacob Feldman
Igor Elbert and Jacob Feldman's DecisionCAMP 2016 presentation on flash sale pricing.
Learning Rule-Based Programming Using Games
July 8, 2016 · Mark Proctor
Mark Proctor's DecisionCAMP 2016 presentation on learning rule-based programming through games.
Improving BRMS Efficiency and Performance
July 8, 2016 · James C. Owen and Charles L. Forgy
James C. Owen and Charles L. Forgy's DecisionCAMP 2016 presentation on BRMS efficiency, performance, and conflict resolution.
Melding Process Models and Decision Models
July 8, 2016 · Alan Fish
Alan Fish's DecisionCAMP 2016 presentation on modeling decision-making processes.
Oracle Decision Service: Decision Model and Notation
July 8, 2016 · Gary Hallmark
Gary Hallmark's DecisionCAMP 2016 presentation on Oracle Decision Service and DMN.
Parsing Regulations into DMN
July 8, 2016 · Tom Debevoise
Tom Debevoise's DecisionCAMP 2016 presentation on parsing regulations into DMN.
Solving the Last Mile in Model-Based Development
July 8, 2016 · Larry Goldberg
Larry Goldberg's DecisionCAMP 2016 presentation on the last mile in model-based development.
What-If Analyzer for DMN-Based Decision Models
July 8, 2016 · Jacob Feldman
Jacob Feldman's DecisionCAMP 2016 presentation on analyzing and optimizing DMN-based decision models.
The Decision Boundary Map
July 8, 2016 · Klaus Mueller and Shenghui Cheng
Klaus Mueller and Shenghui Cheng's DecisionCAMP 2016 presentation on visual interfaces for decisions with tradeoffs.
Family Riddle — Progress Corticon
June 1, 2016 · Mike Parish
Progress Corticon solution by Michael Parish (Progress Software) for the Family Riddle challenge.
DMN Interchange Challenge — XSLT/XPath
April 1, 2016 · Bruce Silver
XSLT/XPath solution by Bruce Silver for the DMN Interchange Challenge challenge.
Port Clearance Rules — BiZZdesign
March 1, 2016 · Antonio Plais
BiZZdesign solution by Antonio Plais (CENTUS) for the Port Clearance Rules challenge.
Port Clearance Rules — Blueriq
March 1, 2016 · Maarten Schadd
Blueriq solution by Maarten Schadd (Blueriq) for the Port Clearance Rules challenge.
Port Clearance Rules — Corticon
March 1, 2016 · Mike Parish
Corticon solution by Michael Parish (Progress Software) for the Port Clearance Rules challenge.
Port Clearance Rules — DecisionsFirst
March 1, 2016 · James Taylor
DecisionsFirst solution by James Taylor (Decision Management Solutions) for the Port Clearance Rules challenge.
Port Clearance Rules — Trisotech
March 1, 2016 · Denis Gagne
Trisotech solution by Denis Gagné (Trisotech) for the Port Clearance Rules challenge.
Decision Table for Vacation Days Calculation — Avola
January 1, 2016 · Jordy Voesten
Avola solution by Jordy Voesten (Avola) for the Decision Table for Vacation Days Calculation challenge.
Decision Table for Vacation Days Calculation — Blueriq
January 1, 2016 · Maarten Schadd
Blueriq solution by Maarten Schadd (Blueriq) for the Decision Table for Vacation Days Calculation challenge.
Decision Table for Vacation Days Calculation — Comparative analysis of all 19 submissions
January 1, 2016 · Jan Vanthienen
Comparative analysis of all 19 submissions solution by Prof. Jan Vanthienen (KU Leuven) for the Decision Table for Vacation Days Calculation challenge.
Decision Table for Vacation Days Calculation — Corticon
January 1, 2016 · Mike Parish
Corticon solution by Michael Parish (Progress Software) for the Decision Table for Vacation Days Calculation challenge.
Decision Table for Vacation Days Calculation — DMN
January 1, 2016 · Gary Hallmark
DMN solution by Gary Hallmark (Oracle) for the Decision Table for Vacation Days Calculation challenge.
Decision Table for Vacation Days Calculation — IBM ODM
January 1, 2016 · Emmanuel Bonnet
IBM ODM solution by Emmanuel Bonnet (Softeam Cadextan) for the Decision Table for Vacation Days Calculation challenge.
Decision Table for Vacation Days Calculation — RapidGen
January 1, 2016 · David Durant
RapidGen solution by David Durant (RapidGen) for the Decision Table for Vacation Days Calculation challenge.
Decision Table for Vacation Days Calculation — Trisotech
January 1, 2016 · Mélanie Gauthier
Trisotech solution by Mélanie Gauthier (Trisotech) for the Decision Table for Vacation Days Calculation challenge.
Monkey Business — CPLEX
November 1, 2015 · Alex Fleischer
CPLEX solution by Alex Fleischer for the Monkey Business challenge.
Monkey Business — JSR331
November 1, 2015 · Rick Schreiber
JSR331 solution by Rick Schreiber for the Monkey Business challenge.
Monkey Business — Progress Corticon
November 1, 2015 · Mike Parish
Progress Corticon solution by Michael Parish (Progress Software) for the Monkey Business challenge.
Collections of Cars — Blueriq
September 1, 2015 · Maarten Schadd
Blueriq solution by Maarten Schadd (Blueriq) for the Collections of Cars challenge.
Collections of Cars — Corticon
September 1, 2015 · Mike Parish
Corticon solution by Michael Parish (Progress Software) for the Collections of Cars challenge.
Collections of Cars — DMN FEEL
September 1, 2015 · Gary Hallmark
DMN FEEL solution by Gary Hallmark (Oracle) for the Collections of Cars challenge.
Collections of Cars — FlexRule
September 1, 2015 · Arash Aghlara
FlexRule solution by Arash Aghlara (FlexRule) for the Collections of Cars challenge.
Collections of Cars — R
September 1, 2015 · Riccardo Hertel
R solution by Riccardo Hertel for the Collections of Cars challenge.
Find Duplicate Product Lines — Corticon
August 1, 2015 · Mike Parish
Corticon solution by Michael Parish (Progress Software) for the Find Duplicate Product Lines challenge.
Find Duplicate Product Lines — R
August 1, 2015 · Riccardo Hertel
R solution by Riccardo Hertel for the Find Duplicate Product Lines challenge.
Make a Good Burger — Corticon
June 1, 2015 · Mike Parish
Corticon solution by Michael Parish (Progress Software) for the Make a Good Burger challenge.
Make a Good Burger — CPLEX
June 1, 2015 · Alex Fleischer
CPLEX solution by Alex Fleischer for the Make a Good Burger challenge.
Make a Good Burger — DMN FEEL prototype
June 1, 2015 · Gary Hallmark
DMN FEEL prototype solution by Gary Hallmark (Oracle) for the Make a Good Burger challenge.
Patient Diagnosis Decision — R with naïve Bayes
April 1, 2015 · Riccardo Hertel
R with naïve Bayes solution by Riccardo Hertel for the Patient Diagnosis Decision challenge.
Change-Making Decision — Corticon
February 1, 2015 · Mike Parish
Corticon solution by Michael Parish (Progress Software) for the Change-Making Decision challenge.
Vehicle Insurance: The UServ Product Derby — 3D Relational Rule Base
December 1, 2014 · Leonid Nisenboym
3D Relational Rule Base solution by Leonid Nisenboym for the Vehicle Insurance: The UServ Product Derby challenge.
Vehicle Insurance: The UServ Product Derby — Blueriq
December 1, 2014 · Maarten Schadd
Blueriq solution by Maarten Schadd (Blueriq) for the Vehicle Insurance: The UServ Product Derby challenge.
Vehicle Insurance: The UServ Product Derby — Corticon
December 1, 2014 · Mike Parish
Corticon solution by Michael Parish (Progress Software) for the Vehicle Insurance: The UServ Product Derby challenge.
Vehicle Insurance: The UServ Product Derby — DecisionsFirst with OpenRules
December 1, 2014 · James Taylor
DecisionsFirst with OpenRules solution by James Taylor (Decision Management Solutions) for the Vehicle Insurance: The UServ Product Derby challenge.
Vehicle Insurance: The UServ Product Derby — OpenL Tablets
December 1, 2014 · Yuliya Bastun
OpenL Tablets solution by Yuliya Bastun (EIS Group) for the Vehicle Insurance: The UServ Product Derby challenge.
Vehicle Insurance: The UServ Product Derby — Sapiens Decision
December 1, 2014 · Gil Segal
Sapiens Decision solution by Gil Segal (Sapiens) for the Vehicle Insurance: The UServ Product Derby challenge.
Who Killed Agatha? — Corticon
November 1, 2014 · Mike Parish
Corticon solution by Mike Parish (Progress Software) for the Who Killed Agatha? challenge.
Who Killed Agatha? — CPLEX
November 1, 2014 · Alex Fleischer
CPLEX solution by Alex Fleischer for the Who Killed Agatha? challenge.
Borrowing PASS/FAIL Decision with Mitigation Criteria — IDIOM
October 1, 2014 · Mark Norton
IDIOM solution by Mark Norton (Idiom Software) for the Borrowing PASS/FAIL Decision with Mitigation Criteria challenge.
Borrowing PASS/FAIL Decision with Mitigation Criteria — OpenL Tablets
October 1, 2014 · Hanna Peravalava
OpenL Tablets solution by Hanna Peravalava (EIS Group) for the Borrowing PASS/FAIL Decision with Mitigation Criteria challenge.
Borrowing PASS/FAIL Decision with Mitigation Criteria — Oracle Policy Automation
October 1, 2014 · Martijn Tromm
Oracle Policy Automation solution by Martijn Tromm (Oracle) for the Borrowing PASS/FAIL Decision with Mitigation Criteria challenge.