Explanation
Open the explanation (shows the answer)
The answer is h7. With best play to the end: ±0 (a draw).
Best line: h7 g1 h1 g2 h6 g7 h8 a2 a6 a7
Other moves
| Move | Result | Why |
|---|---|---|
| f8 | -4 (a loss by 4) | The opponent's best answer is g8 (then h7 g7 h8). |
| a7 | -8 (a loss by 8) | The opponent's best answer is a6 (then h7 h6 h1). |
| h6 | -10 (a loss by 10) | The opponent's best answer is h7 (then g2 h1 g1). |
| a6 | -12 (a loss by 12) | The opponent's best answer is a7 (then h7 g1 g8). |
| g8 | -12 (a loss by 12) | The opponent's best answer is f8 (then h7 h8 g2). |
| g7 | -12 (a loss by 12) | g7 is an X-square (diagonal to the corner h8). While the corner is empty it tends to give the corner away. After this move the opponent can play the corner h8. Opponent's moves: 7 after this move, 5 after h7. The opponent's best answer is h8 (then f8 g8 h6). |
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.