1步杀：后到g1 (e3)
li-04xFI命名标签 (格·N)战术主题
一步将杀：找到让对方王无路可逃的一着棋。
难度1264 ShuffleRating——俱乐部棋手水平。
黑方走棋——找出最佳续着
How to recognize this tactic
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 g3, 后 b4, 车 f3, 马 d2, 兵 a3 b3 d4 e5。
黑方：王 b8, 后 e3, 车 h8, 兵 d5 g5 e6 a7 b7 f7。
棋盘上有8枚白棋和9枚黑棋；该题局面出现在第28回合之后。
The position in numbers
White are ahead by 1 points of material (21 against 20; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g3, the black king on b8.
It is Black to move on move 28, with 35 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 6. Files fully open (no pawns of either colour): c, h — natural highways for the rooks and queen.
The Black 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
28... Qg1#
为何奏效
- 好棋！后到g1保持压力（#）。
- 该变着以1步强制将杀结束。
Move by move
- 28… Qg1# — 后 to g1 and it is checkmate
本题的题型
天梯杀
两个重子一线一线地推进，切断所有退路。
阶梯杀（线性杀）：两枚重子像爬梯子一样协作——一枚沿一条线切断国王，另一枚在相邻线上将军，一步步把他逼向棋盘边缘。这是双车的经典技巧：将军，国王退一排，另一只车再将军——直到底线将杀。唯一的危险是国王贴近来攻击你的车。真遇上了，把那只车平移到同一条线的远端即可。
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 009
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