3步杀：牵制，f3
li-0LIe2战术主题
三步将杀：一段以将杀收尾的强制着法。
牵制：棋子一动，身后更有价值的目标就会暴露。
难度1950 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
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.
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 h2, 车 a5, 马 g3, 兵 g2 h3。
黑方：王 g6, 车 b2, 马 e1。
棋盘上有5枚白棋和3枚黑棋；该题局面出现在第64回合之后。
The position in numbers
White are ahead by 2 points of material (10 against 8; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h2, the black king on g6.
It is Black to move on move 64, with 22 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 2 pawns, Black 0. Files fully open (no pawns of either colour): a, b, c, d, e, f — natural highways for the rooks and queen. Half-open for Black: g, h.
The Black king has 5 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
64... Nf3+ 65. Kh1 Rb1+ 66. Nf1 Rxf1#
为何奏效
- 好棋！马到f3保持压力（#2）。
- 好棋！车到b1保持压力（#1）。
- 好棋！车到f1保持压力（#）。
- 该变着以3步强制将杀结束。
- 若改走Kh1，则Rb1+，你仍占优。
Move by move
- 64… Nf3+ — 马 to f3 with check
- 65. Kh1 — 王 to h1
- Rb1+ — 车 to b1 with check
- 66. Nf1 — 马 to f1
- Rxf1# — 车 to f1 (capture) and it is checkmate
本题的题型
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。
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。
残局战术
残局里同样有战术——子力稀少时照样出击。
战术不会随着后的兑换而退休：捉双、牵制和双重攻击在残局里照样活跃。子力所剩无几，因此这里每一次战术损失几乎都直接定胜负。特征还是老几样：无保护的棋子、王与棋子同线、即将升变的兵。建议：即使在「纯技术」残局里，每步棋前也要搜一遍战术——自己的和对方的。
来源
源自 Lichess 题库（CC0）。
题包 014
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