1步杀：车到f8 (f1·2)
li-0257T命名标签 (格·N)战术主题
悬子：对方有棋子无人保护——吃掉它。
一步将杀：找到让对方王无路可逃的一着棋。
难度1459 ShuffleRating——俱乐部棋手水平。
白方走棋——找出最佳续着
How to recognize this tactic
A hanging piece is one that is attacked and not defended, or defended too few times. Count attackers against defenders on each enemy unit; where attackers win, take it — often with an in-between move or a check to gain the extra tempo.
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 g1, 后 g3, 车 a1 f1, 象 e2 h6, 马 d5, 兵 b2 c2 g2 a3 h3。
黑方：王 h8, 后 d8, 车 a8 f8, 象 e5 d7, 马 c6 e8, 兵 a7 b7 c7 g7 h7。
棋盘上有12枚白棋和13枚黑棋；该题局面出现在第19回合之后。
The position in numbers
Black are ahead by 3 points of material (33 against 36; 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 h8.
It is White to move on move 19, with 61 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 5. Files fully open (no pawns of either colour): d, e, f — natural highways for the rooks and queen.
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
19. Rxf8#
为何奏效
- 好棋！车到f8保持压力（#）。
- 该变着以1步强制将杀结束。
Move by move
- 19. Rxf8# — 车 to f8 (capture) and it is checkmate
本题的题型
底线杀
王被自己的兵关在里面——重子直捣底线。
底线杀：国王被自己一排未动的兵关在后面，车或后突入底线一锤定音。识别特征：王前的兵没动过、没有通气口，底线只有一个守卫，甚至无人看守。常见手法是先引开或兑掉那个孤独的哨兵，再沿线突击。在自己的对局中要及时开气孔：一步兵着就能免除一场突发灾难。
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。
反击
别忙着防守——用更大的威胁回敬对手。
反击：面对威胁你的回应不是防守，而是自己的威胁——更强的那种。趁对手吃你的兵，你宣布将杀：这笔账算在你这边。当直接防守都不好时寻找反击：你有没有将军、攻后的手段、做杀的威胁？新手的错误是对每个威胁都条件反射地防守，从不先查一查对攻资源。
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 011
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