Explanation
Open the explanation (shows the answer)
The answer is g1. With best play to the end: ±0 (a draw).
Best line: g1 h2 c1 g7 h3 a3 b3 b2 b1 h4
Other moves
| Move | Result | Why |
|---|---|---|
| h4 | -4 (a loss by 4) | The opponent's best answer is g1 (then c1 h3 h2). |
| a3 | -8 (a loss by 8) | The opponent's best answer is a2 (then g1 h4 c1). |
| g8 | -14 (a loss by 14) | The opponent's best answer is g7 (then g1 h2 c1). |
| h3 | -16 (a loss by 16) | The opponent's best answer is a3 (then g1 g7 g8). |
| g7 | -16 (a loss by 16) | The opponent's best answer is a3 (then h4 h3 b3). |
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.