捉双：后到b8
li-067Nu战术主题
捉双：一子同时攻击两个目标——无法两全。
难度1737 ShuffleRating——适合进阶战术爱好者。
白方走棋——找出最佳续着
How to recognize this tactic
A fork is one piece attacking two targets at once. Look for a knight, pawn or queen move that lands where it hits the king (or a bigger piece) and a second undefended unit on the same turn — the opponent can save only one.
General method: before you move, list the forcing candidates — every check, every capture, every direct threat — and calculate those first. The solution to a tactic is almost always among them.
棋盘上的局面
白方：王 g1, 后 c7, 车 f1, 兵 f2 g2 h3 c4。
黑方：王 g8, 后 f6, 车 a2, 兵 a4 d6 h6 f7 g7。
棋盘上有7枚白棋和8枚黑棋；该题局面出现在第24回合之后。
The position in numbers
Black are ahead by 1 points of material (18 against 19; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g1, the black king on g8.
It is White to move on move 24, with 26 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 5. Files fully open (no pawns of either colour): b, e — natural highways for the rooks and queen. Half-open for White: a, d.
The White king has 2 empty squares to step to right now — the fewer they are, the closer a mating net.
解答与讲解
主要变着
24. Qb8+ Kh7 25. Qb1+ Qg6 26. Qxa2
为何奏效
- 好棋！后到b8保持压力（+5.4）。
- 好棋！后到b1保持压力（+5.4）。
- 好棋！后到a2保持压力（+5.7）。
- 你赢得一子——车。
- 若改走Kh7，则Qb1+，你仍占优。
Move by move
- 24. Qb8+ — 后 to b8 with check
- Kh7 — 王 to h7
- 25. Qb1+ — 后 to b1 with check
- Qg6 — 后 to g6
- 26. Qxa2 — 后 to a2 (capture)
本题的题型
王室捉双
带将军的捉双：王必须躲开，另一个子就丢了。
王家捉双是带将军的捉双：两个目标之一是国王本身。国王必须首先应将，因此没有人、也没有时间去救第二个棋子。寻找这样的格子：你的棋子从那里将军，同时攻击无保护的后或车。这是最可靠的捉双——对手根本没有选择的余地。
来源
源自 Lichess 题库（CC0）。
经 Stockfish 深度 20+ 验证。
解法强制性已确认（verified）。
题包 013
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