牵制：后到h5 (h3)
li-095US命名标签 (格·N)战术主题
牵制：棋子一动，身后更有价值的目标就会暴露。
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 pin freezes a piece in front of a more valuable one behind it. Scan the ranks, files and diagonals your bishop, rook or queen controls: if an enemy piece cannot move without exposing its king or queen, it is pinned and can be piled on or bypassed.
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 c1, 后 h3, 车 d1 g1, 马 b1, 兵 b2 c2 h2 a3 d4 f6。
黑方：王 g8, 后 a1, 车 e2 f8, 象 d5, 马 c6, 兵 h5 d6 g6 a7 b7 c7 f7。
棋盘上有11枚白棋和13枚黑棋；该题局面出现在第25回合之后。
The position in numbers
Black are ahead by 4 points of material (28 against 32; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on c1, the black king on g8.
It is White to move on move 25, with 32 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 7. Files fully open (no pawns of either colour): e — natural highways for the rooks and queen. Half-open for White: g.
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
25. Qxh5 Be4 26. Qxe2
为何奏效
- 精彩！后到h5是成功的弃子：你略占优（+3.0）。
- 好棋！后到e2保持压力（+4.0）。
- 你赢得一子——车。
- 若改走Be4，则Qxe2，你赢得车。
Move by move
- 25. Qxh5 — 后 to h5 (capture)
- Be4 — 象 to e4
- 26. Qxe2 — 后 to e2 (capture)
本题的题型
后的捉双
皇后落在一个能同时攻击两个目标的格子上。
后沿直线、横线和斜线出击，因此她比任何棋子都更容易形成捉双。寻找这样的格子：后从那里同时攻击两个无保护的目标——最常见的是将军外加一个悬子。斜线打击尤其致命：斜向将军同时瞄准角落里的车，是这一主题的经典。请记住：两个目标都必须无保护，否则你的「捉双」只是放空枪。
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 013
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