1步杀：闪击，g5
li-05kaR战术主题
闪击：一子闪开，另一子的攻击随之而来。
一步将杀：找到让对方王无路可逃的一着棋。
难度1612 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
A discovered attack fires when one piece steps aside and unmasks the piece behind it. Look for your own units that block a rook, bishop or queen: moving the front piece — ideally with a threat of its own — springs two attacks in one move.
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 h2, 后 h5, 车 a1, 象 b3 h6, 兵 a2 f2 c3 d3 h3 b4 e4 g6。
黑方：王 h8, 后 e7, 车 a8 f8, 象 g5, 马 c6, 兵 e5 a6 d6 b7 c7 g7。
棋盘上有13枚白棋和12枚黑棋；该题局面出现在第24回合之后。
The position in numbers
Black are ahead by 3 points of material (28 against 31; 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 h8.
It is White to move on move 24, with 35 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 8 pawns, Black 6. No file is fully open, so the heavy pieces have to be pried in.
White hold the bishop pair, an edge in open lines. The White king has 4 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
24. Bxg5#
为何奏效
- 好棋！象到g5保持压力（#）。
- 该变着以1步强制将杀结束。
Move by move
- 24. Bxg5# — 象 to g5 (capture) and it is checkmate
本题的题型
闪杀
一个子闪开——后面的子完成将杀。
闪杀：走动的棋子并不将杀——致命一击来自它身后的远程棋子。走动的那枚完全自由：它可以落在任何地方，最好去夺走国王最后的格子或守住关键点。寻找与敌王同线的己方车、象或后，中间恰好隔着一枚你的棋子。选择揭幕之着时别忘了它的第二职责：关死国王的逃生门。
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 012
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