牵制：车到d5 (d8)
li-0HeRL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1927 ShuffleRating——适合进阶战术爱好者。
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 b1, 车 d1 d5, 马 c3 f3, 兵 a2 b2 f2 g2 h2 e4。
黑方：王 e8, 车 c8 d8, 象 g6 e7, 兵 f6 h6 a7 f7 g7。
棋盘上有11枚白棋和10枚黑棋；该题局面出现在第18回合之后。
The position in numbers
White are ahead by 1 points of material (22 against 21; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on b1, the black king on e8.
It is Black to move on move 18, with 24 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 5. Files fully open (no pawns of either colour): c, d — natural highways for the rooks and queen. Half-open for Black: b, e.
Black hold the bishop pair, an edge in open lines. 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
18... Rxd5 19. Rxd5 Rxc3
为何奏效
- 好棋！车到d5保持压力（+4.6）。
- 好棋！车到c3保持压力（+4.4）。
- 你赢得一子——车。
- 若改走Rxd5，则Rxc3，你赢得车。
Move by move
- 18… Rxd5 — 车 to d5 (capture)
- 19. Rxd5 — 车 to d5 (capture)
- Rxc3 — 车 to c3 (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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