3步杀:闪击,b1
li-06wTL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1589 ShuffleRating——俱乐部棋手水平。
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 a2, 车 d2, 马 e3, 兵 b2 a3 f4 h4 d5。
黑方:王 g7, 车 c1, 象 e4, 兵 c4 h5 a7 f7。
棋盘上有8枚白棋和7枚黑棋;该题局面出现在第38回合之后。
The position in numbers
White are ahead by 1 points of material (13 against 12; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on a2, the black king on g7.
It is Black to move on move 38, with 31 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 4. Files fully open (no pawns of either colour): e, g — natural highways for the rooks and queen. Half-open for Black: b, d.
The Black king has 7 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
38... Bb1+ 39. Ka1 Bc2+ 40. Ka2 Bb3#
为何奏效
- 好棋!象到b1保持压力(#2)。
- 最佳着法。象到c2正是引擎的选择(#1)。
- 最佳着法。象到b3正是引擎的选择(#)。
- 该变着以3步强制将杀结束。
- 若改走Ka1,则Bc2+,你仍占优。
Move by move
- 38… Bb1+ — 象 to b1 with check
- 39. Ka1 — 王 to a1
- Bc2+ — 象 to c2 with check
- 40. Ka2 — 王 to a2
- Bb3# — 象 to b3 and it is checkmate
本题的题型
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。
闪将
移动的子闪出将军——它自己趁机可以随便吃子。
闪将:棋子走开,露出身后远程棋子的将军。在国王忙于应将的时候,刚才移动的棋子可以为所欲为、毫发无损——哪怕顺手吃掉皇后。寻找与敌王同线的己方远程棋子,且两者之间恰好隔着一枚你的棋子。规则很简单:在所有可选的闪开方式中,挑那个能吃到或攻击到最贵目标的。
残局战术
残局里同样有战术——子力稀少时照样出击。
战术不会随着后的兑换而退休:捉双、牵制和双重攻击在残局里照样活跃。子力所剩无几,因此这里每一次战术损失几乎都直接定胜负。特征还是老几样:无保护的棋子、王与棋子同线、即将升变的兵。建议:即使在「纯技术」残局里,每步棋前也要搜一遍战术——自己的和对方的。
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 011
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