Checkers, backgammon, chess, Go, poker, and other games have witnessed the machines’ invasions, falling one by one to dominant A.I.s. Now crosswords have joined them. “Dr. Fill” algorithm wasn’t perfect; it finished the tournament with three errors. But its blazing speed—most puzzles in well under a minute—helped it outscore all comers, edging the top human by a razor-thin 15 points. Link