Explanation
Open the explanation (shows the answer)
The answer is h2. With best play to the end: +16 (a win by 16).
Best line: h2 g3 f1 e1 c1 f2 b8 g7 g1 g8
Other moves
| Move | Result | Why |
|---|---|---|
| e1 | -14 (a loss by 14) | After this move the opponent can play the corner h8. Opponent's moves: 8 after this move, 5 after h2. The opponent's best answer is h8 (then c1 g8 g3). |
| g3 | -18 (a loss by 18) | After this move the opponent can play the corner h8. The opponent's best answer is h8 (then f2 h2 c1). |
| f1 | -18 (a loss by 18) | After this move the opponent can play the corner h8. Opponent's moves: 7 after this move, 5 after h2. The opponent's best answer is h8 (then f2 e1 c1). |
| f2 | -18 (a loss by 18) | After this move the opponent can play the corner h8. Opponent's moves: 9 after this move, 5 after h2. The opponent's best answer is h8 (then c1 e1 f1). |
| c1 | -20 (a loss by 20) | After this move the opponent can play the corner h8. Opponent's moves: 7 after this move, 5 after h2. The opponent's best answer is h8 (then e1 g2 h1). |
| b8 | -26 (a loss by 26) | After this move the opponent can play the corner h8. The opponent's best answer is h8 (then g3 g8 f1). |
About these puzzles
Each position comes from a real game. The engine solved it to the end (perfect play by both sides) and only positions with a single best move, clearly better than the second-best move, were kept. "Best play wins by N" is the final disc margin when both sides play perfectly.
If you play a different move, you see the final margin your move leads to with perfect play afterwards, and how much it gave up. Results are stored only in this browser.
To be graded during a full game, go to the Reversi dojo.