Explanation
Open the explanation (shows the answer)
The answer is g1. With best play to the end: ±0 (a draw).
Best line: g1 f7 f8 e8 pass h7 g7 b8 a8 g8
Other moves
| Move | Result | Why |
|---|---|---|
| f8 | -12 (a loss by 12) | Opponent's moves: 7 after this move, 5 after g1. Openness: 2 for this move (flips 2), 0 for g1 (flips 1). The opponent's best answer is g1 (then e8 f7 g8). |
| f7 | -14 (a loss by 14) | Opponent's moves: 7 after this move, 5 after g1. Openness: 2 for this move (flips 4), 0 for g1 (flips 1). The opponent's best answer is g1 (then e8 h7 g7). |
| e8 | -16 (a loss by 16) | Opponent's moves: 7 after this move, 5 after g1. Openness: 2 for this move (flips 4), 0 for g1 (flips 1). The opponent's best answer is g1 (then pass f7 g8). |
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.