1步杀：双重攻击，d3
li-0H8LG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2039 ShuffleRating——专家水平——很少有人一次解出。
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 d2, 车 a1 d1, 象 b3, 马 d5, 兵 b2 c2 g2 h2 f3 a4 d4。
黑方：王 c8, 车 e3 e8, 象 f4 a6, 兵 a7 b7 c7 f7 g7 h7。
棋盘上有12枚白棋和11枚黑棋；该题局面出现在第21回合之后。
The position in numbers
White are ahead by 1 points of material (23 against 22; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on d2, the black king on c8.
It is Black to move on move 21, with 42 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 6. Files fully open (no pawns of either colour): e — natural highways for the rooks and queen. Half-open for Black: d.
Black hold the bishop pair, an edge in open lines. 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
21... Rd3#
为何奏效
- 好棋！车到d3保持压力（#）。
- 该变着以1步强制将杀结束。
Move by move
- 21… Rd3# — 车 to d3 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。
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）。
题包 014
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