3步杀：闪击，g7
li-0MZdu战术主题
闪击：一子闪开，另一子的攻击随之而来。
三步将杀：一段以将杀收尾的强制着法。
难度1856 ShuffleRating——适合进阶战术爱好者。
白方走棋——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.
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 h2, 后 g4, 车 g1, 象 d3 g3, 兵 a2 c2 f2 b3 f4 e5。
黑方：王 h8, 后 d4, 车 d8 f8, 象 g7, 兵 b5 c6 e6 h6 a7 f7。
棋盘上有11枚白棋和11枚黑棋；该题局面出现在第27回合之后。
The position in numbers
Black are ahead by 2 points of material (26 against 28; 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 h8.
It is White to move on move 27, with 38 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. Files fully open (no pawns of either colour): d, g — natural highways for the rooks and queen. Half-open for White: h.
White hold the bishop pair, an edge in open lines. The White king has 3 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
27. Qxg7+ Kxg7 28. Bh4+ Kh8 29. Bf6#
为何奏效
- 好棋！后到g7保持压力（#2）。
- 好棋！象到h4保持压力（#1）。
- 好棋！象到f6保持压力（#）。
- 该变着以3步强制将杀结束。
- 若改走Kxg7，则Bh4+，你仍占优。
Move by move
- 27. Qxg7+ — 后 to g7 (capture) with check
- Kxg7 — 王 to g7 (capture)
- 28. Bh4+ — 象 to h4 with check
- Kh8 — 王 to h8
- 29. Bf6# — 象 to f6 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。
王室捉双
带将军的捉双：王必须躲开，另一个子就丢了。
王家捉双是带将军的捉双：两个目标之一是国王本身。国王必须首先应将，因此没有人、也没有时间去救第二个棋子。寻找这样的格子：你的棋子从那里将军，同时攻击无保护的后或车。这是最可靠的捉双——对手根本没有选择的余地。
来源
源自 Lichess 题库（CC0）。
题包 013
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