捉双:后到b4
li-00tsE战术主题
捉双:一子同时攻击两个目标——无法两全。
难度1092 ShuffleRating——俱乐部棋手水平。
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 f1, 后 f4, 车 e1, 兵 a2 c2 f2 g2 h2。
黑方:王 f8, 后 d8, 车 c3, 兵 b5 a6 f7 g7 h7。
棋盘上有8枚白棋和8枚黑棋;该题局面出现在第23回合之后。
The position in numbers
Material is level — 19 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on f1, the black king on f8.
It is White to move on move 23, with 41 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): d, e — natural highways for the rooks and queen. Half-open for White: b.
The White king has 2 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. Qb4+ Kg8 24. Qxc3
为何奏效
- 好棋!后到b4保持压力(+5.8)。
- 好棋!后到c3保持压力(+6.0)。
- 你赢得一子——车。
- 若改走Kg8,则Qxc3,你赢得车。
Move by move
- 23. Qb4+ — 后 to b4 with check
- Kg8 — 王 to g8
- 24. Qxc3 — 后 to c3 (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 007
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