吃掉无保护的后（d1） (e2)
li-0RzkG命名标签 (格·N)战术主题
悬子：对方有棋子无人保护——吃掉它。
难度2233 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 g2, 后 f2, 车 d1 a8, 兵 g3 b5 f5 c6。
黑方：王 g7, 后 e2, 车 c7, 马 f6, 兵 g4 c5 b6 f7。
棋盘上有8枚白棋和8枚黑棋；该题局面出现在第44回合之后。
The position in numbers
White are ahead by 2 points of material (23 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 g2, the black king on g7.
It is Black to move on move 44, with 34 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 4. Files fully open (no pawns of either colour): a, d, e, h — natural highways for the rooks and queen.
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
44... Qxd1 45. Qf4 Qf3+ 46. Qxf3 gxf3+
为何奏效
- 好棋！后到d1保持压力（+3.2）。
- 好棋！后到f3保持压力（+3.6）。
- 好棋！兵到f3保持压力（+3.5）。
- 你赢得一子——后。
- 若改走Qf4，则Qf3+，你赢得车。
Move by move
- 44… Qxd1 — 后 to d1 (capture)
- 45. Qf4 — 后 to f4
- Qf3+ — 后 to f3 with check
- 46. Qxf3 — 后 to f3 (capture)
- gxf3+ — 兵 to f3 (capture) with check
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。
简化
换掉重子，把局面导入赢定的残局。
简化是兑现优势的技术：兑掉后和车，你就掐灭了对方的反扑，把对局引入赢定的残局。规则简单：子力占优的一方兑子，但保兵。当子力已经赢到手、对手还在虚张声势时，就去找兑换。错误做法是回避兑后，任由对手用没完没了的威胁搅浑水。
来源
源自 Lichess 题库（CC0）。
题包 015
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