2步杀：闪击，c8
li-0OJv1战术主题
闪击：一子闪开，另一子的攻击随之而来。
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1818 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
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.
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 b8, 车 f1, 马 d4, 兵 c2 g2 a4。
黑方：王 e8, 后 h7, 象 h3 e7, 兵 g3 d5 a7 f7。
棋盘上有7枚白棋和8枚黑棋；该题局面出现在第30回合之后。
The position in numbers
White are ahead by 1 points of material (20 against 19; 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 e8.
It is Black to move on move 30, with 3 legal replies to weigh — only the line that keeps the advantage solves the puzzle. Black are in check right now, so every reply must answer the check.
White keeps 3 pawns, Black 4. Files fully open (no pawns of either colour): b, e, h — natural highways for the rooks and queen. Half-open for Black: c.
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
30... Bc8+ 31. Kg1 Qh2#
为何奏效
- 好棋！象到c8保持压力（#1）。
- 好棋！后到h2保持压力（#）。
- 该变着以2步强制将杀结束。
- 若改走Kg1，则Qh2#，即被将杀。
Move by move
- 30… Bc8+ — 象 to c8 with check
- 31. Kg1 — 王 to g1
- Qh2# — 后 to h2 and it is checkmate
本题的题型
护卫后杀
皇后贴脸将杀，身后有自己人保护。
有保护的贴身后杀是最常见的将杀图案：后紧贴国王落子，因为有己方棋子或兵保护而成杀。国王无处可逃：吃后不行——那格有保护，而周围所有格子后亲自看管。寻找敌王旁边受保护的格子：有马、象或兵控制它，后的登陆就成了将杀。只需核实一件事：那个格子真有保护，否则国王会直接吃掉后。
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。
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。
来源
源自 Lichess 题库（CC0）。
题包 013
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