捉双：象到g5 (h6)
li-00lA1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1588 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 g1, 车 a1 d1, 象 c4 h6, 马 c3 g7, 兵 a2 b2 c2 f2 d3 e4。
黑方：王 d8, 后 h3, 车 a8 h8, 象 c5, 兵 e5 d6 g6 a7 b7 c7 h7。
棋盘上有13枚白棋和12枚黑棋；该题局面出现在第18回合之后。
The position in numbers
Black are ahead by 1 points of material (28 against 29; 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 d8.
It is White to move on move 18, with 33 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 7. No file is fully open, so the heavy pieces have to be pried in. Half-open for White: g, h.
White hold the bishop pair, an edge in open lines. The White 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
18. Bg5+ Kd7 19. Be6+ Qxe6 20. Nxe6
为何奏效
- 好棋！象到g5保持压力（+4.1）。
- 好棋！象到e6保持压力（+3.8）。
- 好棋！马到e6保持压力（+3.8）。
- 你赢得一子——后。
- 若改走Kd7，则Be6+，你仍占优。
Move by move
- 18. Bg5+ — 象 to g5 with check
- Kd7 — 王 to d7
- 19. Be6+ — 象 to e6 with check
- Qxe6 — 后 to e6 (capture)
- 20. Nxe6 — 马 to e6 (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）。
经 Stockfish 深度 20+ 验证。
解法强制性已确认（verified）。
题包 011
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