牵制：象到e7
li-0BMlM战术主题
牵制：棋子一动，身后更有价值的目标就会暴露。
难度1976 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 pin freezes a piece in front of a more valuable one behind it. Scan the ranks, files and diagonals your bishop, rook or queen controls: if an enemy piece cannot move without exposing its king or queen, it is pinned and can be piled on or bypassed.
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 c1, 后 d2, 车 g1 h1, 象 g5, 马 a2, 兵 b2 c2 f2 a3 d3 f3 e4 h4。
黑方：王 g8, 后 d8, 车 a8 f8, 象 e7, 马 h5, 兵 b5 c5 e5 a6 d6 f7 g7 h7。
棋盘上有14枚白棋和14枚黑棋；该题局面出现在第16回合之后。
The position in numbers
Material is level — 33 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on c1, the black king on g8.
It is White to move on move 16, with 32 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 8 pawns, Black 8. No file is fully open, so the heavy pieces have to be pried in. Half-open for White: g.
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
16. Bxe7 Qxe7 17. Qh6 f5 18. Qxh5
为何奏效
- 精彩！象到e7是成功的弃子：你略占优（+2.7）。
- 好棋！后到h6保持压力（+2.9）。
- 好棋！后到h5保持压力（+3.2）。
- 你赢得一子——象。
- 若改走Qxe7，则Qh6，你仍占优。
Move by move
- 16. Bxe7 — 象 to e7 (capture)
- Qxe7 — 后 to e7 (capture)
- 17. Qh6 — 后 to h6
- f5 — 兵 to f5
- 18. Qxh5 — 后 to h5 (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 014
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