2步杀：捉双，e4 (h4)
li-0LC7e命名标签 (格·N)战术主题
捉双：一子同时攻击两个目标——无法两全。
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2248 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 fork is one piece attacking two targets at once. Look for a knight, pawn or queen move that lands where it hits the king (or a bigger piece) and a second undefended unit on the same turn — the opponent can save only one.
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 g8, 车 c2 d7, 象 f1, 兵 a3 e3 b4 c5。
黑方：王 h6, 后 h4, 车 f6, 兵 f2 g3 h3 e5 f5 a6 b6 b7。
棋盘上有9枚白棋和11枚黑棋；该题局面出现在第36回合之后。
The position in numbers
White are ahead by 4 points of material (26 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 h1, the black king on h6.
It is Black to move on move 36, with 22 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 8. Files fully open (no pawns of either colour): d — natural highways for the rooks and queen. Half-open for Black: c.
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
36... Qe4+ 37. Bg2 hxg2#
为何奏效
- 好棋！后到e4保持压力（#1）。
- 最佳着法。兵到g2正是引擎的选择（#）。
- 该变着以2步强制将杀结束。
- 若改走Bg2，则hxg2#，即被将杀。
Move by move
- 36… Qe4+ — 后 to e4 with check
- 37. Bg2 — 象 to g2
- hxg2# — 兵 to g2 (capture) and it is checkmate
本题的题型
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。
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。
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）。
题包 015
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