吃掉无保护的后（b8）
li-0JhDP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2567 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.
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 h5, 车 a1 b8, 象 g5, 兵 c2 g2。
黑方：王 b7, 后 g3, 车 f2, 象 c5, 兵 e6 a7 d7 g7。
棋盘上有7枚白棋和8枚黑棋；该题局面出现在第31回合之后。
The position in numbers
White are ahead by 3 points of material (24 against 21; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h1, the black king on b7.
It is Black to move on move 31, with 4 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 2 pawns, Black 4. Files fully open (no pawns of either colour): b, f, h — natural highways for the rooks and queen. Half-open for Black: c.
The Black 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
31... Qxb8 32. Rb1+ Bb6
为何奏效
- 好棋！后到b8保持压力（+3.6）。
- 好棋！象到b6保持压力（+4.0）。
- 你赢得一子——车。
- 若改走Rb1+，则Bb6，你赢得车。
Move by move
- 31… Qxb8 — 后 to b8 (capture)
- 32. Rb1+ — 车 to b1 with check
- Bb6 — 象 to b6
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）。
题包 015
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