捉双:后到d5 (e5)
li-0BZTU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2392 ShuffleRating——专家水平——很少有人一次解出。
黑方走棋——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 h1, 后 c2, 车 f1 a2, 象 e2, 马 c6, 兵 b2 g2 h2 c3 f3 d5。
黑方:王 g8, 后 e5, 车 a8 f8, 象 g5 d7, 兵 e4 a5 f5 d6 g7 h7。
棋盘上有12枚白棋和12枚黑棋;该题局面出现在第23回合之后。
The position in numbers
Material is level — 31 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on h1, the black king on g8.
It is Black to move on move 23, with 44 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. No file is fully open, so the heavy pieces have to be pried in. Half-open for Black: b, c.
Black hold the bishop pair, an edge in open lines. The Black 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
23... Qxd5 24. Nxa5 Rxa5 25. Rxa5 Qxa5
为何奏效
- 好棋!后到d5保持压力(+3.8)。
- 好棋!车到a5保持压力(+3.7)。
- 好棋!后到a5保持压力(+4.2)。
- 你赢得一子——车。
- 若改走Nxa5,则Rxa5,你赢得马。
Move by move
- 23… Qxd5 — 后 to d5 (capture)
- 24. Nxa5 — 马 to a5 (capture)
- Rxa5 — 车 to a5 (capture)
- 25. Rxa5 — 车 to a5 (capture)
- Qxa5 — 后 to a5 (capture)
本题的题型
得利交换
在同一格上的一连串强制吃子,最后是你占便宜。
有利兑换:在同一格上进行强制的连环吃子,收尾时你多出子力。一切靠算术:数清该格的攻击者与防守者,记住吃子队列里每个棋子的价值。按正确顺序吃——先便宜的,后贵的,否则赚的买卖会变成亏本。典型错误是算到一半就停手,漏掉对方最后一次回吃。
来源
源自 Lichess 题库(CC0)。
题包 015
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