3步杀：捉双，c2
li-00rHa战术主题
引离：迫使防守的棋子离开岗位。
捉双：一子同时攻击两个目标——无法两全。
三步将杀：一段以将杀收尾的强制着法。
难度1941 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.
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.
In a mate in three every move must be forcing; the defender should never get a free tempo. Find the check or threat that herds the king, calculate the single defence to each, and confirm the net closes on the third move.
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 b1, 后 g4, 车 d1 h1, 象 d2 b5, 马 c3 d4, 兵 c2 f2 g2 h2 c5 e5。
黑方：王 c8, 后 a3, 车 d8 h8, 象 a4, 马 b4 e7, 兵 d5 e6 a7 b7 f7 g7 h7。
棋盘上有14枚白棋和14枚黑棋；该题局面出现在第14回合之后。
The position in numbers
White are ahead by 2 points of material (37 against 35; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on b1, the black king on c8.
It is Black to move on move 14, with 37 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 7. No file is fully open, so the heavy pieces have to be pried in. Half-open for Black: c.
White hold the bishop pair, an edge in open lines. The Black king has 2 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
14... Bxc2+ 15. Nxc2 Qb3+ 16. Ka1 Nxc2#
为何奏效
- 好棋！象到c2保持压力（#2）。
- 好棋！后到b3保持压力（#1）。
- 好棋！马到c2保持压力（#）。
- 该变着以3步强制将杀结束。
- 若改走Nxc2，则Qb3+，你仍占优。
Move by move
- 14… Bxc2+ — 象 to c2 (capture) with check
- 15. Nxc2 — 马 to c2 (capture)
- Qb3+ — 后 to b3 with check
- 16. Ka1 — 王 to a1
- Nxc2# — 马 to c2 (capture) and it is checkmate
本题的题型
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。
三步杀
三步之内的强制将杀。
三步杀是一道强制的阶梯：你的每一步都收窄对手的选择，第三步画上句号。到将军和弃子中寻找开局之着：杀题里安静的首着虽少见，却格外阴险。脑中要有变化树：每种防守对应自己的分支。别在第二步就停下——最终的将杀图景必须亲眼算到。
角落杀
被逼进角落的王，再也没有落脚的格子。
角落杀：国王被赶进棋盘一角，那里他只有三个相邻格——而它们全被夺走或占据。角落是国王最糟糕的住所：进攻方需要控制的格子最少。用将军把国王往角落里赶，绝不让他溜回中心。在最后一击之前切断所有逃亡路线——将杀几乎会自己成形。
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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