1步杀：牵制，g3
li-00jPw战术主题
一步将杀：找到让对方王无路可逃的一着棋。
牵制：棋子一动，身后更有价值的目标就会暴露。
难度1077 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.
A pin freezes a piece in front of a more valuable one behind it. Scan the ranks, files and diagonals your bishop, rook or queen controls: if an enemy piece cannot move without exposing its king or queen, it is pinned and can be piled on or bypassed.
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 h1, 后 h6, 车 a1 f7, 象 c4, 马 c3, 兵 a2 b2 g2 h2 d5 e5。
黑方：王 g8, 后 h4, 车 a8 e8, 象 g4 b6, 马 h5, 兵 a7 b7 c7。
棋盘上有12枚白棋和10枚黑棋；该题局面出现在第18回合之后。
The position in numbers
Material is level — 31 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on h1, the black king on g8.
It is Black to move on move 18, with 42 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 3. Files fully open (no pawns of either colour): f — natural highways for the rooks and queen. Half-open for Black: d, e, g, h.
Black hold the bishop pair, an edge in open lines. The Black king has 1 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
18... Ng3#
为何奏效
- 好棋！马到g3保持压力（#）。
- 该变着以1步强制将杀结束。
Move by move
- 18… Ng3# — 马 to g3 and it is checkmate
本题的题型
马杀
马以它独一无二的角度送出致命一击。
马杀：最后一击由马完成——它是唯一无法用垫挡化解将军的棋子。正因如此，马对被挤住的国王格外致命：只有走王或吃掉马本身才有救。识别特征：国王周围的格子被占据或受控，而存在一个马能安然无恙地跳过去将军的格子。提前把马调往前线：它比远程棋子慢，但它的打击无法招架。
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。
解杀
杀棋已成威胁——化解它并保持优势。
解杀：对手离将杀只差一步——但现在轮到你走，这改变了一切。寻找既解除杀棋威胁又保住你优势的防守：常常是一步将军或反威胁，让对方腾不出手来做杀。先准确说出对方要在哪个格子将杀你——否则就是蒙着眼防守。错误做法是走一步实际并没有解除威胁的「防守」。
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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