Explanation
Open the explanation (shows the answer)
The answer is d1. With best play to the end: ±0 (a draw).
Best line: d1 h2 b1 e1 b2 c2 f1 g1 h1 g2
Other moves
| Move | Result | Why |
|---|---|---|
| e1 | -10 (a loss by 10) | The opponent's best answer is h2 (then b2 b1 c2). |
| c2 | -10 (a loss by 10) | Opponent's moves: 7 after this move, 5 after d1. The opponent's best answer is h2 (then g2 h1 g1). |
| b2 | -14 (a loss by 14) | Opponent's moves: 7 after this move, 5 after d1. The opponent's best answer is d1 (then g2 h1 e1). |
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.