吃掉无保护的王（a6）
li-0LSaC战术主题
悬子：对方有棋子无人保护——吃掉它。
困子：对方棋子无处可逃——抓住它。
难度1821 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 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.
A trapped piece has no safe square. Spot an enemy piece that has wandered offside or been hemmed in, then play the move that takes away its last escape and wins it — often a quiet pawn push or a covering minor piece.
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 c6, 车 a1 c1, 象 a6, 马 h2, 兵 a2 f2 d5 b6。
黑方：王 a7, 后 h6, 车 b8 c8, 马 c5, 兵 e5 g5 d6 f7 h7。
棋盘上有10枚白棋和10枚黑棋；该题局面出现在第29回合之后。
The position in numbers
White are ahead by 2 points of material (29 against 27; 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 a7.
It is Black to move on move 29, with 2 legal replies to weigh — only the line that keeps the advantage solves the puzzle. Black are in check right now, so every reply must answer the check.
White keeps 4 pawns, Black 5. Files fully open (no pawns of either colour): c — natural highways for the rooks and queen. Half-open for Black: a, b.
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
29... Kxa6 30. Rxc5 Rxc6
为何奏效
- 好棋！王到a6保持压力（+2.5）。
- 精彩！车到c6是成功的弃子：你略占优（+2.4）。
- 你赢得一子——后。
- 若改走Rxc5，则Rxc6，你赢得后。
Move by move
- 29… Kxa6 — 王 to a6 (capture)
- 30. Rxc5 — 车 to c5 (capture)
- Rxc6 — 车 to c6 (capture)
本题的题型
引入
用弃子把王或某个子引到致命的格子上。
引入是引离的镜像兄弟：你用弃子把国王或棋子拖到致命的格子上。经典手法是弃后或弃车：对方一吃，国王就落入马的捉双、闪将或杀网。先找到目标将被下一击命中的格子，再准备一份它无法拒绝的礼物。要把组合算到底：只有后续着法是强制的，引入才能成立。
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」。
困后
最强的子孤军深入——再也回不来了。
捉后：最强的棋子走得太远，找不到回家的路。最常见的剧本是后贪吃远处的兵——经典的毒兵。危险信号：后的退路很少，而对方的轻子一步步带着节奏把退路一一切断。用后在敌营吃兵之前，数一数她的逃生路线——少于两条，就按兵不动。
来源
源自 Lichess 题库（CC0）。
题包 013
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