捉双：马到d5 (c3·2)
li-0KgOv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1959 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 b2, 后 d3, 车 e2, 马 c3 e5, 兵 f2 a3 e3 g3 d4 h4。
黑方：王 b8, 后 h5, 车 e7 c8, 象 b6, 兵 d5 f5 a6 b7。
棋盘上有11枚白棋和9枚黑棋；该题局面出现在第41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 b2, the black king on b8.
It is White to move on move 41, with 37 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 4. Files fully open (no pawns of either colour): c — natural highways for the rooks and queen. Half-open for White: b.
The White king has 6 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
41. Nxd5 Rxe5 42. dxe5
为何奏效
- 好棋！马到d5保持压力（+2.8）。
- 好棋！兵到e5保持压力（+2.7）。
- 你赢得一子——车。
- 若改走Rxe5，则dxe5，你赢得车。
Move by move
- 41. Nxd5 — 马 to d5 (capture)
- Rxe5 — 车 to e5 (capture)
- 42. dxe5 — 兵 to e5 (capture)
本题的题型
制胜一击
找到那记强制得子的妙击。
制胜一击：强制赢得子力，却不归入任何单一的教科书主题。通用的战术配方在此适用：找出无保护的棋子、站位别扭的国王、超载的线路。按力度顺序枚举强制着法：将军、吃子、威胁——绝大多数组合正是从其中之一开始。不要凭感觉评估：把具体变化算到结果确凿无疑为止。
来源
源自 Lichess 题库（CC0）。
题包 014
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