Explanation
Open the explanation (shows the answer)
The answer is f8. With best play to the end: ±0 (a draw).
Best line: f8 g8 h7 b5 b4 a3 a4 b3 b2 a1
Other moves
| Move | Result | Why |
|---|---|---|
| a6 | -12 (a loss by 12) | Openness: 2 for this move (flips 4), 0 for f8 (flips 2). The opponent's best answer is a7 (then f8 b5 b3). |
| a7 | -16 (a loss by 16) | Opponent's moves: 9 after this move, 7 after f8. Openness: 3 for this move (flips 5), 0 for f8 (flips 2). The opponent's best answer is a6 (then b5 a4 pass). |
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.