牵制：马到e7
li-05HWi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1873 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 g1, 后 h6, 车 a1 f1, 象 b3, 马 f3 d5, 兵 c2 f2 g2 h2 a3 d3 b4 e4。
黑方：王 g8, 后 d8, 车 a8 f8, 象 g4 e7, 马 c6 h7, 兵 b5 e5 a6 d6 c7 f7。
棋盘上有15枚白棋和14枚黑棋；该题局面出现在第15回合之后。
The position in numbers
Black are ahead by 1 points of material (36 against 37; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g1, the black king on g8.
It is White to move on move 15, with 48 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 8 pawns, Black 6. No file is fully open, so the heavy pieces have to be pried in.
Black hold the bishop pair, an edge in open lines. The White king has 1 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
15. Nxe7+ Qxe7 16. Qg6+ Kh8 17. Qxg4
为何奏效
- 好棋！马到e7保持压力（+3.6）。
- 好棋！后到g6保持压力（+3.3）。
- 好棋！后到g4保持压力（+3.4）。
- 你赢得一子——象。
- 若改走Qxe7，则Qg6+，你仍占优。
Move by move
- 15. Nxe7+ — 马 to e7 (capture) with check
- Qxe7 — 后 to e7 (capture)
- 16. Qg6+ — 后 to g6 with check
- Kh8 — 王 to h8
- 17. Qxg4 — 后 to g4 (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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