2步杀：车到c1 (d1)
li-0NitZ命名标签 (格·N)战术主题
两步将杀：第一步制造无法化解的威胁，第二步完成将杀。
难度1997 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
Mate in two usually opens with a forcing move — a check, a capture or an unstoppable threat — that strips the king of squares or defenders, so the follow-up mate becomes unavoidable. Look for the first move that leaves the opponent only losing replies.
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 f1, 车 d1 h1, 象 b3 g3, 兵 a2 b2 f2 g2 h2。
黑方：王 c8, 车 d8 e8, 象 f5, 马 g6, 兵 d3 f6 a7 b7 h7。
棋盘上有10枚白棋和10枚黑棋；该题局面出现在第20回合之后。
The position in numbers
Material is level — 21 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on f1, the black king on c8.
It is White to move on move 20, with 27 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 5. Files fully open (no pawns of either colour): c, e — natural highways for the rooks and queen. Half-open for White: d.
White hold the bishop pair, an edge in open lines. The White 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
20. Rc1+ Kd7 21. Rc7#
为何奏效
- 好棋！车到c1保持压力（#1）。
- 好棋！车到c7保持压力（#）。
- 该变着以2步强制将杀结束。
- 若改走Kd7，则Rc7#，即被将杀。
Move by move
- 20. Rc1+ — 车 to c1 with check
- Kd7 — 王 to d7
- 21. Rc7# — 车 to c7 and it is checkmate
本题的题型
两步杀
两步之内的强制将杀。
两步杀：你走一步，对方任意应一步，然后是致命一击。从最强制的首着开始：将军和弃子，把对手的选择压到最少。对他的每一种应法，你都必须备好将杀——所有回应都要检查，一个不漏。常见的失误是算清了漂亮的防守，却忘了那个平淡无奇的。
来源
源自 Lichess 题库（CC0）。
题包 014
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