吃掉无保护的后（b2）
li-03LpJ战术主题
悬子：对方有棋子无人保护——吃掉它。
难度1909 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 g1, 后 c2, 车 a1 d1, 象 g3, 马 b1, 兵 a2 g2 h2 c3 f3 e4。
黑方：王 g8, 后 d7, 车 b2 e8, 象 d6, 马 f6, 兵 c6 h6 a7 c7 f7 g7。
棋盘上有12枚白棋和12枚黑棋；该题局面出现在第17回合之后。
The position in numbers
Material is level — 31 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on g1, the black king on g8.
It is White to move on move 17, with 34 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. Files fully open (no pawns of either colour): b, d — natural highways for the rooks and queen.
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
17. Qxb2 Bc5+ 18. Rd4
为何奏效
- 最佳着法。后到b2正是引擎的选择（+3.6）。
- 好棋！车到d4保持压力（+4.2）。
- 你赢得一子——车。
- 若改走Bc5+，则Rd4，你赢得车。
Move by move
- 17. Qxb2 — 后 to b2 (capture)
- Bc5+ — 象 to c5 with check
- 18. Rd4 — 车 to d4
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 014
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