3步杀：闪击，c2
li-011GG战术主题
闪击：一子闪开，另一子的攻击随之而来。
双重攻击：一步棋同时制造两个威胁。
三步将杀：一段以将杀收尾的强制着法。
难度2126 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 discovered attack fires when one piece steps aside and unmasks the piece behind it. Look for your own units that block a rook, bishop or queen: moving the front piece — ideally with a threat of its own — springs two attacks in one move.
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.
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 c1, 后 d8, 车 d1 b8, 兵 h2 b4 e5。
黑方：王 h7, 车 d2, 象 c3 f5, 兵 h6 f7 g7。
棋盘上有7枚白棋和7枚黑棋；该题局面出现在第36回合之后。
The position in numbers
White are ahead by 8 points of material (22 against 14; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on c1, the black king on h7.
It is Black to move on move 36, with 34 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 3 pawns, Black 3. Files fully open (no pawns of either colour): a, c, d — natural highways for the rooks and queen. Half-open for Black: b, e.
Black 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
36... Rc2+ 37. Kb1 Rb2+ 38. Ka1 Rxh2#
为何奏效
- 好棋！车到c2保持压力（#2）。
- 最佳着法。车到b2正是引擎的选择（#1）。
- 最佳着法。车到h2正是引擎的选择（#）。
- 该变着以3步强制将杀结束。
- 若改走Kb1，则Rb2+，你仍占优。
Move by move
- 36… Rc2+ — 车 to c2 with check
- 37. Kb1 — 王 to b1
- Rb2+ — 车 to b2 with check
- 38. Ka1 — 王 to a1
- Rxh2# — 车 to h2 (capture) and it is checkmate
本题的题型
闪杀
一个子闪开——后面的子完成将杀。
闪杀：走动的棋子并不将杀——致命一击来自它身后的远程棋子。走动的那枚完全自由：它可以落在任何地方，最好去夺走国王最后的格子或守住关键点。寻找与敌王同线的己方车、象或后，中间恰好隔着一枚你的棋子。选择揭幕之着时别忘了它的第二职责：关死国王的逃生门。
唯一着法
其他任何一步都会输——找到唯一撑得住的那一步。
唯一着法：除了独一无二的那步棋，其余全输的局面。这里不能「顺手」下棋：把原则上不同的防守都过一遍——逃跑、垫挡、兑换、反击——再淘汰被驳倒的。这类题目的标志：显而易见的着法很快就输，而正解常常看起来古怪。先弄清威胁你的究竟是什么——那步唯一的防守自会现身。
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。
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 015
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