吃掉无保护的后（a8）
li-0BbLS战术主题
悬子：对方有棋子无人保护——吃掉它。
解救棋子：你的棋子正受攻击——找到最佳解救方法。
难度1906 ShuffleRating——适合进阶战术爱好者。
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.
Here the task is defensive: one of your pieces is under attack and must be rescued without losing more. Look for a move that saves it with tempo — a counter-check, an equal counter-attack or an interposition — rather than a passive retreat.
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 h1, 后 d5, 车 a1 f1, 象 d3, 兵 b2 c2 g2 h2 a3。
黑方：王 g7, 后 b6, 车 f6 a8, 马 g4, 兵 b5 f5 a6 g6 h7。
棋盘上有10枚白棋和10枚黑棋；该题局面出现在第24回合之后。
The position in numbers
Material is level — 27 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on h1, the black king on g7.
It is White to move on move 24, with 46 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 White: f.
The White king has 0 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
24. Qxa8 Qc7 25. g3
为何奏效
- 好棋！后到a8保持压力（+4.1）。
- 好棋！兵到g3保持压力（+4.5）。
- 你赢得一子——车。
- 若改走Qc7，则g3，你赢得车。
Move by move
- 24. Qxa8 — 后 to a8 (capture)
- Qc7 — 后 to c7
- 25. g3 — 兵 to g3
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。
救子
被攻击的子不但能救，还能顺手赚一笔。
救子：你的棋子被攻击，任务是别白白送掉它。办法有几种：带节奏地撤退、加以保护、垫挡攻击，或制造更凶的对攻威胁。机械后撤之前，先找带反击的撤退——既救了子又赚了时间。典型错误是惊慌失措逃到随便一个格子，结果棋子又被抓住。
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 014
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