吃掉无保护的后（e3）
li-07h4W战术主题
悬子：对方有棋子无人保护——吃掉它。
难度1782 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.
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 b1, 后 d2, 车 c4, 马 d4, 兵 a2 b3 f4 h4 g5。
黑方：王 g8, 后 e3, 车 d8, 象 f5, 兵 d3 b4 a5 g6 f7 h7。
棋盘上有9枚白棋和10枚黑棋；该题局面出现在第39回合之后。
The position in numbers
Black are ahead by 1 points of material (22 against 23; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on b1, the black king on g8.
It is White to move on move 39, with 34 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 6. Files fully open (no pawns of either colour): c, e — natural highways for the rooks and queen. Half-open for White: d.
The White 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
39. Qxe3 d2+ 40. Nxf5 d1=Q+ 41. Rc1
为何奏效
- 好棋！后到e3保持压力（+5.1）。
- 好棋！马到f5保持压力（+5.0）。
- 好棋！车到c1保持压力（+5.1）。
- 你赢得一子——象。
- 若改走d2+，则Nxf5，你赢得后。
Move by move
- 39. Qxe3 — 后 to e3 (capture)
- d2+ — 兵 to d2 with check
- 40. Nxf5 — 马 to f5 (capture)
- d1=Q+ — 兵 to d1 with check
- 41. Rc1 — 车 to c1
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）。
经 Stockfish 深度 20+ 验证。
解法强制性已确认（verified）。
题包 013
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