3步杀:闪击,b3
li-0CYah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1953 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.
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 b1, 后 h2, 车 d1 h1, 象 d2, 马 b3, 兵 a2 c2 f3 e4 g4。
黑方:王 g8, 后 c8, 车 c3 f8, 象 e6, 马 b4, 兵 a6 d6 g6 b7 e7。
棋盘上有11枚白棋和11枚黑棋;该题局面出现在第23回合之后。
The position in numbers
Material is level — 30 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on b1, the black king on g8.
It is Black to move on move 23, with 44 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 5. Files fully open (no pawns of either colour): h — natural highways for the rooks and queen. Half-open for Black: c, f.
The Black king has 2 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
23... Rxb3+ 24. axb3 Qxc2+ 25. Ka1 Qa2#
为何奏效
- 好棋!车到b3保持压力(#2)。
- 好棋!后到c2保持压力(#1)。
- 好棋!后到a2保持压力(#)。
- 该变着以3步强制将杀结束。
- 若改走axb3,则Qxc2+,你仍占优。
Move by move
- 23… Rxb3+ — 车 to b3 (capture) with check
- 24. axb3 — 兵 to b3 (capture)
- Qxc2+ — 后 to c2 (capture) with check
- 25. Ka1 — 王 to a1
- Qa2# — 后 to a2 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。
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。
解杀
杀棋已成威胁——化解它并保持优势。
解杀:对手离将杀只差一步——但现在轮到你走,这改变了一切。寻找既解除杀棋威胁又保住你优势的防守:常常是一步将军或反威胁,让对方腾不出手来做杀。先准确说出对方要在哪个格子将杀你——否则就是蒙着眼防守。错误做法是走一步实际并没有解除威胁的「防守」。
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 014
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