1步杀：双重攻击，e1
li-0GbDM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1924 ShuffleRating——适合进阶战术爱好者。
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 c2, 后 d1, 车 a1 h1, 象 c1 f1, 马 a3 d4, 兵 a2 b2 g2 h2 f3 c4 d5。
黑方：王 f7, 后 e7, 车 a8 h8, 象 b4 f5, 马 d3 f6, 兵 a4 b7 c7 g7 h7。
棋盘上有15枚白棋和13枚黑棋；该题局面出现在第15回合之后。
The position in numbers
White are ahead by 2 points of material (38 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 c2, the black king on f7.
It is Black to move on move 15, with 67 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 5. Files fully open (no pawns of either colour): e — natural highways for the rooks and queen. Half-open for Black: d, f.
The Black 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
15... Ne1#
为何奏效
- 好棋！马到e1保持压力（#）。
- 该变着以1步强制将杀结束。
Move by move
- 15… Ne1# — 马 to e1 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。
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。
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。
来源
源自 Lichess 题库（CC0）。
题包 014
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