Reversi puzzles
Reversi puzzles come in two kinds. The easy ones ask you to force your way into a corner within two moves. The medium and hard ones are exact endings with eight or eleven empty squares in which only one move wins; every other move was checked to draw or lose.
Pick a number. A tick means you solved it in this browser.
Easy
#1–14 · Look for a move that leaves the opponent only replies that open a corner for you, or a disc that, once flipped, gives you a diagonal into the corner.
Medium
#15–27 · With eight empties left, count where the last move in each region will fall; the winning move often gives up discs now to keep the final say.
Hard
#28–40 · Eleven empties are too many to guess. Start with the moves that take away the opponent's options or force a pass, and check whether the corner you are tempted by really holds.