捉双：后到c3
li-0K22M战术主题
捉双：一子同时攻击两个目标——无法两全。
难度1827 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 c8, 车 e1 f1, 兵 g2 a3 e3 h3 b4 f4。
黑方：王 g7, 后 f5, 车 d2 e6, 兵 c2 a4 b5 h5 g6 f7。
棋盘上有10枚白棋和10枚黑棋；该题局面出现在第38回合之后。
The position in numbers
Material is level — 25 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on g1, the black king on g7.
It is White to move on move 38, with 30 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. Files fully open (no pawns of either colour): d — natural highways for the rooks and queen. Half-open for White: c.
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
38. Qc3+ Qf6 39. Qxd2
为何奏效
- 好棋！后到c3保持压力（+4.4）。
- 好棋！后到d2保持压力（+4.6）。
- 你赢得一子——车。
- 若改走Qf6，则Qxd2，你赢得车。
Move by move
- 38. Qc3+ — 后 to c3 with check
- Qf6 — 后 to f6
- 39. Qxd2 — 后 to d2 (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）。
题包 013
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