捉双:后到e4
li-05ROq战术主题
捉双:一子同时攻击两个目标——无法两全。
难度1012 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 g2, 后 e2, 车 b1 a2, 兵 f2 h2 c3 e3 g3 a4 d4。
黑方:王 g8, 后 e6, 车 c8 d8, 兵 c4 c5 a6 b6 g6 h6 f7。
棋盘上有11枚白棋和11枚黑棋;该题局面出现在第26回合之后。
The position in numbers
Material is level — 26 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on g2, the black king on g8.
It is Black to move on move 26, with 34 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: d, e.
The Black king has 4 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
26... Qe4+ 27. f3 Qxb1
为何奏效
- 好棋!后到e4保持压力(+4.9)。
- 好棋!后到b1保持压力(+5.2)。
- 你赢得一子——车。
- 若改走f3,则Qxb1,你赢得车。
Move by move
- 26… Qe4+ — 后 to e4 with check
- 27. f3 — 兵 to f3
- Qxb1 — 后 to b1 (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。
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 006
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