2步杀：双重攻击，h2
li-0CKzc战术主题
双重攻击：一步棋同时制造两个威胁。
两步将杀：第一步制造无法化解的威胁，第二步完成将杀。
难度1883 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.
Mate in two usually opens with a forcing move — a check, a capture or an unstoppable threat — that strips the king of squares or defenders, so the follow-up mate becomes unavoidable. Look for the first move that leaves the opponent only losing replies.
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 e1, 车 a1 g1, 马 f4, 兵 b2 f2 h2 a3 g3 c4 d5。
黑方：王 c8, 后 h3, 车 h6 g8, 兵 f3 e4 h4 a6 b7 c7。
棋盘上有12枚白棋和10枚黑棋；该题局面出现在第34回合之后。
The position in numbers
White are ahead by 4 points of material (29 against 25; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h1, the black king on c8.
It is Black to move on move 34, with 36 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 6. No file is fully open, so the heavy pieces have to be pried in. Half-open for Black: d, g.
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
34... Qxh2+ 35. Kxh2 hxg3#
为何奏效
- 好棋！后到h2保持压力（#1）。
- 好棋！兵到g3保持压力（#）。
- 该变着以2步强制将杀结束。
- 若改走Kxh2，则hxg3#，即被将杀。
Move by move
- 34… Qxh2+ — 后 to h2 (capture) with check
- 35. Kxh2 — 王 to h2 (capture)
- hxg3# — 兵 to g3 (capture) 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。
两步杀
两步之内的强制将杀。
两步杀：你走一步，对方任意应一步，然后是致命一击。从最强制的首着开始：将军和弃子，把对手的选择压到最少。对他的每一种应法，你都必须备好将杀——所有回应都要检查，一个不漏。常见的失误是算清了漂亮的防守，却忘了那个平淡无奇的。
兵杀
最不起眼的小兵送出最后一击。
兵杀：最后一击由军中最卑微的士兵完成。这发生在陷于己方和敌方棋子之间的国王身上：兵从斜前方一格发起打击，而他已退无可退。识别特征：国王周围的格子被夺走或占据，你的兵距离出击只差一步。进攻中别把兵排除在外——它们的打击成本最低，因而最令人难堪。
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 014
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