吃掉无保护的象（f8）
li-0OYyi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2487 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 f1, 车 f8, 象 g3, 兵 e5 g5 h7。
黑方：王 h8, 象 e7, 马 d3, 兵 d4 b6。
棋盘上有6枚白棋和5枚黑棋；该题局面出现在第37回合之后。
The position in numbers
White are ahead by 3 points of material (11 against 8; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on f1, the black king on h8.
It is Black to move on move 37, with 3 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 3 pawns, Black 2. Files fully open (no pawns of either colour): a, c, f — natural highways for the rooks and queen. Half-open for Black: e, g, h.
The Black king has 2 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
37... Bxf8 38. g6 Nc5 39. Bf2 Ne6
为何奏效
- 好棋！象到f8保持压力（+1.9）。
- 好棋！马到c5保持压力（+2.1）。
- 合理的出子：马到e6。
- 你赢得一子——车。
- 若改走g6，则Nc5，你赢得车。
Move by move
- 37… Bxf8 — 象 to f8 (capture)
- 38. g6 — 兵 to g6
- Nc5 — 马 to c5
- 39. Bf2 — 象 to f2
- Ne6 — 马 to e6
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。
残局战术
残局里同样有战术——子力稀少时照样出击。
战术不会随着后的兑换而退休：捉双、牵制和双重攻击在残局里照样活跃。子力所剩无几，因此这里每一次战术损失几乎都直接定胜负。特征还是老几样：无保护的棋子、王与棋子同线、即将升变的兵。建议：即使在「纯技术」残局里，每步棋前也要搜一遍战术——自己的和对方的。
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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