吃掉无保护的后（e7）
li-01E12战术主题
悬子：对方有棋子无人保护——吃掉它。
难度2124 ShuffleRating——专家水平——很少有人一次解出。
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 a1, 后 h7, 车 e1 f1, 马 d3, 兵 b2 c2 g2 h2 a3 e3。
黑方：王 c8, 后 a4, 车 b6 e7, 象 d4, 兵 d5 f5 a6 e6 b7 c7。
棋盘上有11枚白棋和11枚黑棋；该题局面出现在第26回合之后。
The position in numbers
Material is level — 28 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on a1, the black king on c8.
It is White to move on move 26, with 37 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. No file is fully open, so the heavy pieces have to be pried in. Half-open for White: d, f.
The White 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
26. Qxe7 Bxb2+ 27. Nxb2
为何奏效
- 好棋！后到e7保持压力（+5.2）。
- 好棋！马到b2保持压力（+5.8）。
- 你赢得一子——车。
- 若改走Bxb2+，则Nxb2，你赢得车。
Move by move
- 26. Qxe7 — 后 to e7 (capture)
- Bxb2+ — 象 to b2 (capture) with check
- 27. Nxb2 — 马 to b2 (capture)
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 015
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