3步杀：兵到g4 (g2)
li-04MT4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1177 ShuffleRating——俱乐部棋手水平。
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 h2, 车 g7, 象 e5, 兵 a2 g2 h3 f4。
黑方：王 h5, 后 c4, 兵 b5 f5 h6 a7。
棋盘上有7枚白棋和6枚黑棋；该题局面出现在第35回合之后。
The position in numbers
Black are ahead by 1 points of material (12 against 13; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h2, the black king on h5.
It is White to move on move 35, with 28 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 4. Files fully open (no pawns of either colour): c, d, e — natural highways for the rooks and queen. Half-open for White: b.
The White king has 3 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
35. g4+ fxg4 36. hxg4+ Kh4 37. Bf6#
为何奏效
- 好棋！兵到g4保持压力（#2）。
- 好棋！兵到g4保持压力（#1）。
- 好棋！象到f6保持压力（#）。
- 该变着以3步强制将杀结束。
- 若改走fxg4，则hxg4+，你仍占优。
Move by move
- 35. g4+ — 兵 to g4 with check
- fxg4 — 兵 to g4 (capture)
- 36. hxg4+ — 兵 to g4 (capture) with check
- Kh4 — 王 to h4
- 37. Bf6# — 象 to f6 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。
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 007
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