3步杀：后到h7 (e7·2)
li-08woy命名标签 (格·N)战术主题
三步将杀：一段以将杀收尾的强制着法。
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
In a mate in three every move must be forcing; the defender should never get a free tempo. Find the check or threat that herds the king, calculate the single defence to each, and confirm the net closes on the third move.
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 c5, 后 e7, 象 e4, 兵 c2 b3 e3 e6。
黑方：王 g8, 后 f1 a2, 车 f2, 兵 a5 g5 h6。
棋盘上有7枚白棋和7枚黑棋；该题局面出现在第42回合之后。
The position in numbers
Black are ahead by 10 points of material (16 against 26; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on c5, the black king on g8.
It is White to move on move 42, with 32 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 3. Files fully open (no pawns of either colour): d, f — natural highways for the rooks and queen. Half-open for White: a, g, h.
The White king has 5 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
42. Qh7+ Kf8 43. e7+ Ke8 44. Bc6#
为何奏效
- 好棋！后到h7保持压力（#2）。
- 好棋！兵到e7保持压力（#1）。
- 好棋！象到c6保持压力（#）。
- 该变着以3步强制将杀结束。
- 若改走Kf8，则e7+，你仍占优。
Move by move
- 42. Qh7+ — 后 to h7 with check
- Kf8 — 王 to f8
- 43. e7+ — 兵 to e7 with check
- Ke8 — 王 to e8
- 44. Bc6# — 象 to c6 and it is checkmate
本题的题型
三步杀
三步之内的强制将杀。
三步杀是一道强制的阶梯：你的每一步都收窄对手的选择，第三步画上句号。到将军和弃子中寻找开局之着：杀题里安静的首着虽少见，却格外阴险。脑中要有变化树：每种防守对应自己的分支。别在第二步就停下——最终的将杀图景必须亲眼算到。
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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