Explanation
Open the explanation (shows the answer)
The answer is g3. With best play to the end: +2 (a win by 2).
Best line: g3 g2 e2 f7 h1 g1 g8 g7 h8 pass
Other moves
| Move | Result | Why |
|---|---|---|
| e2 | -4 (a loss by 4) | The opponent's best answer is g3 (then f7 g2 h1). |
| f7 | -6 (a loss by 6) | Opponent's moves: 6 after this move, 4 after g3. The opponent's best answer is g3 (then a2 g7 h8). |
| a2 | -10 (a loss by 10) | Opponent's moves: 6 after this move, 4 after g3. The opponent's best answer is e2 (then f7 g2 g3). |
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.