捉双:后到a8 (d5)
li-0Kzfu命名标签 (格·N)战术主题
捉双:一子同时攻击两个目标——无法两全。
难度1907 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 d5, 车 d1, 象 h3, 兵 a2 f2 h2 g3。
黑方:王 g8, 后 e2, 车 c2, 象 f6, 兵 h6 a7 f7 g7。
棋盘上有8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
Material is level — 21 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on g1, the black king on g8.
It is White to move on move 24, with 46 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 4. Files fully open (no pawns of either colour): b, c, d, e — natural highways for the rooks and queen.
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. Qa8+ Kh7 25. Bf5+ g6 26. Bxc2
为何奏效
- 好棋!后到a8保持压力(+4.5)。
- 好棋!象到f5保持压力(+4.5)。
- 好棋!象到c2保持压力(+4.5)。
- 你赢得一子——车。
- 若改走Kh7,则Bf5+,你仍占优。
Move by move
- 24. Qa8+ — 后 to a8 with check
- Kh7 — 王 to h7
- 25. Bf5+ — 象 to f5 with check
- g6 — 兵 to g6
- 26. Bxc2 — 象 to c2 (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)。
题包 014
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