捉双:后到a4
li-03XeV战术主题
捉双:一子同时攻击两个目标——无法两全。
难度1571 ShuffleRating——俱乐部棋手水平。
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 c2, 后 f3, 车 b1 d2, 马 a2 e2, 兵 b2 f2 h2 c3 g3 e4 d5。
黑方:王 e7, 后 d7, 车 a8 h8, 象 c5, 马 g6, 兵 a5 e5 d6 f6 h6 c7 f7。
棋盘上有13枚白棋和13枚黑棋;该题局面出现在第20回合之后。
The position in numbers
Material is level — 32 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on c2, the black king on e7.
It is Black to move on move 20, with 42 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 7. No file is fully open, so the heavy pieces have to be pried in. Half-open for Black: b, g.
The Black king has 3 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
20... Qa4+ 21. b3 Qxa2+ 22. Rb2 Qa3
为何奏效
- 好棋!后到a4保持压力(+2.9)。
- 好棋!后到a2保持压力(+3.1)。
- 好棋!后到a3保持压力(+3.1)。
- 你赢得一子——马。
- 若改走b3,则Qxa2+,你赢得马。
Move by move
- 20… Qa4+ — 后 to a4 with check
- 21. b3 — 兵 to b3
- Qxa2+ — 后 to a2 (capture) with check
- 22. Rb2 — 车 to b2
- Qa3 — 后 to a3
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 011
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