捉双:后到b8 (e5)
li-0KPBp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1824 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 e5, 车 d4, 兵 b2 f2 g2 h3。
黑方:王 g8, 后 c6, 车 c2, 兵 a4 a5 g6 f7 g7。
棋盘上有7枚白棋和8枚黑棋;该题局面出现在第33回合之后。
The position in numbers
Black are ahead by 1 points of material (18 against 19; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g1, the black king on g8.
It is White to move on move 33, with 46 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 5. Files fully open (no pawns of either colour): c, d, e — natural highways for the rooks and queen. Half-open for White: a.
The White 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
33. Qb8+ Qc8 34. Rd8+ Qxd8 35. Qxd8+
为何奏效
- 好棋!后到b8保持压力(+4.4)。
- 好棋!车到d8保持压力(+5.2)。
- 好棋!后到d8保持压力(+5.0)。
- 你赢得一子——后。
- 若改走Qc8,则Rd8+,你仍占优。
Move by move
- 33. Qb8+ — 后 to b8 with check
- Qc8 — 后 to c8
- 34. Rd8+ — 车 to d8 with check
- Qxd8 — 后 to d8 (capture)
- 35. Qxd8+ — 后 to d8 (capture) with check
本题的题型
围猎被牵制子
被牵制的子逃不掉——再次攻击它,把它拿下。
被牵制的棋子无法逃跑——这意味着只要再攻击它一次,就能整个赢下它。数一数攻击者和防守者:如果进攻方更多,这个子就是你的了。最好的「第二攻击者」是兵:它比它能吃到的任何东西都便宜。别急着立刻吃——先加强压力,然后再收割。
连将追击
步步将军——把王一路追到必败之地。
连将追击:你的每一步都是将军,对手连一秒钟都腾不出来实施自己的计划。国王被赶着满盘跑,直到丢子或撞上致命一击。这类变化最容易计算:每次将军,王只有寥寥几种应法——全部枚举即可。养成习惯:任何尖锐局面的计算都从将军开始,它们是棋盘上最强制的着法。
来源
源自 Lichess 题库(CC0)。
题包 013
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