Explanation
Open the explanation (shows the answer)
The answer is c8. With best play to the end: +2 (a win by 2).
Best line: c8 a2 b1 b2 a1 g2 h1 g1 pass h7
Other moves
| Move | Result | Why |
|---|---|---|
| a2 | -18 (a loss by 18) | The opponent's best answer is g8 (then g7 g1 g2). |
| b1 | -20 (a loss by 20) | The opponent's best answer is g8 (then a2 g2 g7). |
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.