Explanation
Open the explanation (shows the answer)
The answer is g7. With best play to the end: +10 (a win by 10).
Best line: g7 b2 a2 h6 c3 a1 h8 a3 a4 pass
Other moves
| Move | Result | Why |
|---|---|---|
| c3 | -6 (a loss by 6) | The opponent's best answer is b2 (then a2 a1 a3). |
| a4 | -20 (a loss by 20) | Opponent's moves: 5 after this move, 2 after g7. Openness: 4 for this move (flips 3), 1 for g7 (flips 3). The opponent's best answer is c3 (then g8 h8 h6). |
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.