捉双:后到f7 (g7)
li-04orv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2050 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 h5, 后 g7, 车 h1, 象 g5, 马 g1, 兵 a2 h2 c3 g4。
黑方:王 c8, 后 a1, 车 d3 e8, 象 f2, 兵 a7 b7 f7 h7。
棋盘上有9枚白棋和9枚黑棋;该题局面出现在第22回合之后。
The position in numbers
Black are ahead by 2 points of material (24 against 26; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h5, the black king on c8.
It is White to move on move 22, with 28 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): d, e — natural highways for the rooks and queen. Half-open for White: b, f.
The White king has 1 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
22. Qxf7 Qe1 23. Qc4+ Kb8 24. Qxd3
为何奏效
- 好棋!后到f7保持压力(+2.0)。
- 好棋!后到c4保持压力(+2.2)。
- 好棋!后到d3保持压力(+2.7)。
- 你赢得一子——车。
- 若改走Qe1,则Qc4+,你仍占优。
Move by move
- 22. Qxf7 — 后 to f7 (capture)
- Qe1 — 后 to e1
- 23. Qc4+ — 后 to c4 with check
- Kb8 — 王 to b8
- 24. Qxd3 — 后 to d3 (capture)
本题的题型
制胜一击
找到那记强制得子的妙击。
制胜一击:强制赢得子力,却不归入任何单一的教科书主题。通用的战术配方在此适用:找出无保护的棋子、站位别扭的国王、超载的线路。按力度顺序枚举强制着法:将军、吃子、威胁——绝大多数组合正是从其中之一开始。不要凭感觉评估:把具体变化算到结果确凿无疑为止。
反击
别忙着防守——用更大的威胁回敬对手。
反击:面对威胁你的回应不是防守,而是自己的威胁——更强的那种。趁对手吃你的兵,你宣布将杀:这笔账算在你这边。当直接防守都不好时寻找反击:你有没有将军、攻后的手段、做杀的威胁?新手的错误是对每个威胁都条件反射地防守,从不先查一查对攻资源。
来源
源自 Lichess 题库(CC0)。
题包 014
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