1步杀：双重攻击，g4
li-03rAR战术主题
双重攻击：一步棋同时制造两个威胁。
一步将杀：找到让对方王无路可逃的一着棋。
难度1248 ShuffleRating——俱乐部棋手水平。
黑方走棋——找出最佳续着
How to recognize this tactic
A double attack threatens two things at once so the opponent cannot parry both. Look for a single move — often a queen or knight — that creates two separate threats, such as a check plus an attack on a loose piece.
A mate in one hides among forcing checks. Run through every check you can give: does it cover all the king's escape squares, is the checking piece safe or supported, and can nothing block or capture it? If yes, that is the mate.
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 h3, 后 e7, 车 g4, 象 g3, 兵 b2 h2 a3。
黑方：王 g6, 车 h8, 象 a8, 兵 c5 f5 h5 a6 e6 g7。
棋盘上有7枚白棋和9枚黑棋；该题局面出现在第38回合之后。
The position in numbers
White are ahead by 6 points of material (20 against 14; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h3, the black king on g6.
It is Black to move on move 38, with 4 legal replies to weigh — only the line that keeps the advantage solves the puzzle. Black are in check right now, so every reply must answer the check.
White keeps 3 pawns, Black 6. Files fully open (no pawns of either colour): d — natural highways for the rooks and queen. Half-open for Black: b.
The Black 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
38... hxg4#
为何奏效
- 好棋！兵到g4保持压力（#）。
- 该变着以1步强制将杀结束。
Move by move
- 38… hxg4# — 兵 to g4 (capture) and it is checkmate
本题的题型
双将杀
双将只允许走王——而王已无路可走。
双将杀：最后一步同时由两枚棋子将军，国王再无出路。面对双将，吃子和垫挡都无能为力——只有走王能解，而这里他无处可走。寻找走动棋子自己也将军的闪将：它甚至可以肆无忌惮地落到被打击的格子上。正因如此，双将是最美的弃子组合的加冕之着。
唯一着法
其他任何一步都会输——找到唯一撑得住的那一步。
唯一着法：除了独一无二的那步棋，其余全输的局面。这里不能「顺手」下棋：把原则上不同的防守都过一遍——逃跑、垫挡、兑换、反击——再淘汰被驳倒的。这类题目的标志：显而易见的着法很快就输，而正解常常看起来古怪。先弄清威胁你的究竟是什么——那步唯一的防守自会现身。
一步杀
一步将杀——把它找出来。
一步杀：组合已经落幕，只剩最后一发精准的子弹。方法很简单——列出你所有的将军，对每一个检验国王的三条生路：逃跑、垫挡、吃掉将军者。三条都行不通，那就是将杀。典型错误是爱上找到的第一个将军，漏掉那扇唯一的逃生小窗。
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 008
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