牵制：马到f3 (e5)
li-03NmB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1008 ShuffleRating——俱乐部棋手水平。
黑方走棋——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 g1, 后 d4, 车 d1 f1, 马 b3 f4, 兵 b2 f2 g2 a3 c3 h3。
黑方：王 h8, 后 d7, 车 c8 g8, 马 e5 f6, 兵 e4 d5 f5 b7 h7。
棋盘上有12枚白棋和11枚黑棋；该题局面出现在第24回合之后。
The position in numbers
White are ahead by 1 points of material (31 against 30; 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 h8.
It is Black to move on move 24, with 46 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 5. No file is fully open, so the heavy pieces have to be pried in. Half-open for Black: a, c, g.
The Black king has 1 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
24... Nf3+ 25. Kh1 Nxd4
为何奏效
- 好棋！马到f3保持压力（+4.8）。
- 好棋！马到d4保持压力（+4.8）。
- 你赢得一子——后。
- 若改走Kh1，则Nxd4，你赢得后。
Move by move
- 24… Nf3+ — 马 to f3 with check
- 25. Kh1 — 王 to h1
- Nxd4 — 马 to d4 (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 006
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