3步杀:引离,g4
li-00nsa战术主题
引离:迫使防守的棋子离开岗位。
三步将杀:一段以将杀收尾的强制着法。
难度2285 ShuffleRating——专家水平——很少有人一次解出。
黑方走棋——找出最佳续着
How to recognize this tactic
Deflection drags a defender away from its duty. Identify the enemy piece that guards a key square or mate, then force it to move — with a check, a capture or a threat it must answer — and strike where it no longer defends.
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 g5, 车 d7, 象 c5, 兵 c2 f2 g3 h4 a5。
黑方:王 g8, 车 e4, 象 e5, 兵 f5 a6 g6 b7 h7。
棋盘上有8枚白棋和8枚黑棋;该题局面出现在第34回合之后。
The position in numbers
Material is level — 13 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on g5, the black king on g8.
It is Black to move on move 34, with 28 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): d, e — natural highways for the rooks and queen. Half-open for Black: c.
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
34... Rg4+ 35. Kh6 Rxh4+ 36. gxh4 Bf4#
为何奏效
- 好棋!车到g4保持压力(#2)。
- 好棋!车到h4保持压力(#1)。
- 好棋!象到f4保持压力(#)。
- 该变着以3步强制将杀结束。
- 若改走Kh6,则Rxh4+,你仍占优。
Move by move
- 34… Rg4+ — 车 to g4 with check
- 35. Kh6 — 王 to h6
- Rxh4+ — 车 to h4 (capture) with check
- 36. gxh4 — 兵 to h4 (capture)
- Bf4# — 象 to f4 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。
弃子攻击
舍弃子力,发动决定性的攻击。
弃子攻王:你有意送出子力,为的是掀开王城、发动决定性攻势。当你换来的是实实在在的资产——通向国王的开放线路、赢得的节奏、随时杀入的棋子——弃子才是正确的。识别特征:敌王掩体单薄,你的兵力对准他的老巢,而防守者远水难救近火。铁律是靠计算而不是靠指望:子力一旦送出,就再没有回头路。
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)。
题包 015
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