吃掉无保护的王(g2) (g1·2)
li-0LdAK命名标签 (格·N)战术主题
悬子:对方有棋子无人保护——吃掉它。
难度2194 ShuffleRating——专家水平——很少有人一次解出。
白方走棋——找出最佳续着
How to recognize this tactic
A hanging piece is one that is attacked and not defended, or defended too few times. Count attackers against defenders on each enemy unit; where attackers win, take it — often with an in-between move or a check to gain the extra tempo.
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 g1, 后 d4, 车 d1 d2, 象 h4, 兵 a2 b2 h2 c3 f3。
黑方:王 g8, 后 d7, 车 g2 e8, 马 g5, 兵 d5 h6 a7 b7 f7 g7。
棋盘上有10枚白棋和11枚黑棋;该题局面出现在第22回合之后。
The position in numbers
Black are ahead by 1 points of material (27 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 g1, the black king on g8.
It is White to move on move 22, with 4 legal replies to weigh — only the line that keeps the advantage solves the puzzle. White are in check right now, so every reply must answer the check.
White keeps 5 pawns, Black 6. Files fully open (no pawns of either colour): e — natural highways for the rooks and queen. Half-open for White: d, g.
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
22. Kxg2 Qh3+ 23. Kh1 Qxf3+ 24. Rg2
为何奏效
- 好棋!王到g2保持压力(+2.7)。
- 好棋!王到h1保持压力(+2.9)。
- 好棋!车到g2保持压力(+2.9)。
- 你赢得一子——车。
- 若改走Qh3+,则Kh1,你赢得车。
Move by move
- 22. Kxg2 — 王 to g2 (capture)
- Qh3+ — 后 to h3 with check
- 23. Kh1 — 王 to h1
- Qxf3+ — 后 to f3 (capture) with check
- 24. Rg2 — 车 to g2
本题的题型
制胜一击
找到那记强制得子的妙击。
制胜一击:强制赢得子力,却不归入任何单一的教科书主题。通用的战术配方在此适用:找出无保护的棋子、站位别扭的国王、超载的线路。按力度顺序枚举强制着法:将军、吃子、威胁——绝大多数组合正是从其中之一开始。不要凭感觉评估:把具体变化算到结果确凿无疑为止。
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。
王的撤离
王迈开自己的脚步走出危险区。
国王撤离:掩体既已坍塌,王就徒步走出攻击区——有时要横穿半个棋盘。一连串精确的王着把他带出火力圈,对手的攻势随之消散。识别特征:没有一种直接防守管用,但存在一条经过安全格、通往棋盘僻静角落的路线。要提前算好全程——半路抛锚的王通常就死在半路。
来源
源自 Lichess 题库(CC0)。
题包 015
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