2步杀：闪击，d1
li-0Fyrm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1902 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 c2, 后 g2, 象 d3 f4, 马 d2, 兵 b2 h2 a3 c3 g3 d4 g7。
黑方：王 g8, 车 e1 f8, 象 g4, 马 c6, 兵 b5 d5 a6 c7 f7 h7。
棋盘上有12枚白棋和11枚黑棋；该题局面出现在第20回合之后。
The position in numbers
White are ahead by 3 points of material (25 against 22; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on c2, the black king on g8.
It is Black to move on move 20, with 43 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 6. Files fully open (no pawns of either colour): e — natural highways for the rooks and queen. Half-open for Black: g.
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
20... Bd1+ 21. Kb1 Bb3#
为何奏效
- 好棋！象到d1保持压力（#1）。
- 好棋！象到b3保持压力（#）。
- 该变着以2步强制将杀结束。
- 若改走Kb1，则Bb3#，即被将杀。
Move by move
- 20… Bd1+ — 象 to d1 with check
- 21. Kb1 — 王 to b1
- Bb3# — 象 to b3 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。
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 014
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