捉双:后到f8 (f3)
li-00YYk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2048 ShuffleRating——专家水平——很少有人一次解出。
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 f3, 车 a1 e4, 象 c1, 马 c4, 兵 a2 b2 c2 d3 g3。
黑方:王 c8, 后 d7, 车 f8 g8, 象 d6, 马 c6, 兵 c5 e5 a6 b7 h7。
棋盘上有11枚白棋和11枚黑棋;该题局面出现在第23回合之后。
The position in numbers
Material is level — 30 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 c8.
It is White to move on move 23, with 47 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 5. Files fully open (no pawns of either colour): f — natural highways for the rooks and queen. Half-open for White: e, h.
The White king has 5 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. Qxf8+ Rxf8 24. Nb6+ Kc7 25. Nxd7
为何奏效
- 精彩!后到f8是成功的弃子:你略占优(+2.9)。
- 好棋!马到b6保持压力(+3.0)。
- 精彩!马到d7是成功的弃子:你占优胜势(+3.1)。
- 你赢得一子——后。
- 若改走Rxf8,则Nb6+,你仍占优。
Move by move
- 23. Qxf8+ — 后 to f8 (capture) with check
- Rxf8 — 车 to f8 (capture)
- 24. Nb6+ — 马 to b6 with check
- Kc7 — 王 to c7
- 25. Nxd7 — 马 to d7 (capture)
本题的题型
弃子攻击
舍弃子力,发动决定性的攻击。
弃子攻王:你有意送出子力,为的是掀开王城、发动决定性攻势。当你换来的是实实在在的资产——通向国王的开放线路、赢得的节奏、随时杀入的棋子——弃子才是正确的。识别特征:敌王掩体单薄,你的兵力对准他的老巢,而防守者远水难救近火。铁律是靠计算而不是靠指望:子力一旦送出,就再没有回头路。
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 014
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