2步杀：后到f4 (e5)
li-04TgC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1834 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 g1, 后 e5, 兵 h2 a3 c3 g3 d4。
黑方：王 g4, 后 b2, 象 b6, 兵 a6 h6 b7 c7。
棋盘上有7枚白棋和7枚黑棋；该题局面出现在第37回合之后。
The position in numbers
Black are ahead by 2 points of material (14 against 16; 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 g4.
It is White to move on move 37, with 26 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 4. Files fully open (no pawns of either colour): e, f — natural highways for the rooks and queen. Half-open for White: b.
The White king has 2 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
37. Qf4+ Kh5 38. Qf5#
为何奏效
- 好棋！后到f4保持压力（#1）。
- 好棋！后到f5保持压力（#）。
- 该变着以2步强制将杀结束。
- 若改走Kh5，则Qf5#，即被将杀。
Move by move
- 37. Qf4+ — 后 to f4 with check
- Kh5 — 王 to h5
- 38. Qf5# — 后 to f5 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。
后残局
开放棋盘上的皇后大战——精确高于一切。
后残局阴险难测：后无处不达，一个不准就把胜势变成长将和棋。主题特征：兵很少、王暴露、连环将军的味道飘在空中。提前把王藏好，并利用自己的将军带节奏地调后靠近、或推进通路兵。错误做法是只顾吃兵，把王丢给无穷无尽的将军。
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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