吃掉无保护的后（c3）
li-0JtUr战术主题
悬子：对方有棋子无人保护——吃掉它。
难度2044 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
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 h2, 后 b1, 象 e3, 马 c1 c3, 兵 g2 h3 e4 d5 b6。
黑方：王 g8, 后 a1, 象 b7 d8, 马 e8, 兵 e5 d6 g6 h7。
棋盘上有10枚白棋和9枚黑棋；该题局面出现在第31回合之后。
The position in numbers
White are ahead by 1 points of material (23 against 22; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h2, the black king on g8.
It is Black to move on move 31, 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): a, c, f — natural highways for the rooks and queen. Half-open for Black: b.
Black hold the bishop pair, an edge in open lines. The Black king has 4 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
31... Qxc3 32. Qb5 Nf6
为何奏效
- 好棋！后到c3保持压力（+2.1）。
- 好棋！马到f6保持压力（+2.2）。
- 你赢得一子——马。
- 若改走Qb5，则Nf6，你赢得马。
Move by move
- 31… Qxc3 — 后 to c3 (capture)
- 32. Qb5 — 后 to b5
- Nf6 — 马 to f6
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。
来源
源自 Lichess 题库（CC0）。
题包 014
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