2步杀：牵制，d3
li-01lcr战术主题
引离：迫使防守的棋子离开岗位。
两步将杀：第一步制造无法化解的威胁，第二步完成将杀。
牵制：棋子一动，身后更有价值的目标就会暴露。
难度1636 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
Deflection drags a defender away from its duty. Identify the enemy piece that guards a key square or mate, then force it to move — with a check, a capture or a threat it must answer — and strike where it no longer defends.
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.
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 d2, 后 f6, 车 d1 h1, 象 d3 a5, 兵 c2 g2 e3 f3 d4 h6。
黑方：王 g8, 后 a3, 车 b2 c8, 象 b5, 兵 a4 d5 e6 g6 f7 h7。
棋盘上有12枚白棋和11枚黑棋；该题局面出现在第25回合之后。
The position in numbers
White are ahead by 3 points of material (31 against 28; 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 g8.
It is Black to move on move 25, with 35 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. Files fully open (no pawns of either colour): b — natural highways for the rooks and queen. Half-open for Black: c.
White 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
25... Qxd3+ 26. Ke1 Qxe3#
为何奏效
- 好棋！后到d3保持压力（#1）。
- 最佳着法。后到e3正是引擎的选择（#）。
- 该变着以2步强制将杀结束。
- 若改走Ke1，则Qxe3#，即被将杀。
Move by move
- 25… Qxd3+ — 后 to d3 (capture) with check
- 26. Ke1 — 王 to e1
- Qxe3# — 后 to e3 (capture) and it is checkmate
本题的题型
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。
绝对牵制
一个子被牵制在王前——按规则它根本不能动。
绝对牵制：一个棋子被冻结在自己国王与你的远程棋子之间的直线上——按规则它根本不许移动。特征是三个单位排在一条直线上：你的象、车或后，敌方棋子，以及它身后的敌方国王。被牵制的棋子既不能进攻也不能防守，就当它不在棋盘上。放心地再次攻击它，最好用兵——它无权逃跑。
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 013
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