捉双:后到b1 (c2)
li-03D9B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2371 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 g1, 后 g5, 车 g3 h7, 象 h5, 兵 a2 g2 c3 d4 f4 e5。
黑方:王 f8, 后 c2, 车 a8 g8, 象 d7, 兵 d5 c6 e6 a7 g7。
棋盘上有11枚白棋和10枚黑棋;该题局面出现在第29回合之后。
The position in numbers
White are ahead by 1 points of material (28 against 27; 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 f8.
It is Black to move on move 29, with 28 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 5. Files fully open (no pawns of either colour): b, h — natural highways for the rooks and queen. Half-open for Black: f.
The Black king has 0 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
29... Qb1+ 30. Bd1 Qxh7
为何奏效
- 好棋!后到b1保持压力(+1.8)。
- 好棋!后到h7保持压力(+2.5)。
- 你赢得一子——车。
- 若改走Bd1,则Qxh7,你赢得车。
Move by move
- 29… Qb1+ — 后 to b1 with check
- 30. Bd1 — 象 to d1
- Qxh7 — 后 to h7 (capture)
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。
腾挪
带着先手把自己的子挪开,为决定性一击腾出线路。
让路:决定性打击被你自己的棋子挡住了——那就把它挪开,甚至干脆送掉。关键是带节奏地让路:闪开时带着将军、吃子或威胁,让对手来不及重新布防。识别特征:你看到后或车有一记好杀招,但需要的线路或格子被自己的棋子占着。别舍不得——让路的弃子通常比错失的攻势便宜得多。
来源
源自 Lichess 题库(CC0)。
题包 015
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