牵制：车到a8
li-02OoP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1004 ShuffleRating——俱乐部棋手水平。
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 h2, 后 e4, 车 a6, 兵 f2 g3 h3 a4。
黑方：王 g8, 后 b8, 车 c5, 兵 a5 e6 h6 f7 g7。
棋盘上有7枚白棋和8枚黑棋；该题局面出现在第34回合之后。
The position in numbers
Black are ahead by 1 points of material (18 against 19; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h2, the black king on g8.
It is White to move on move 34, with 37 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 5. Files fully open (no pawns of either colour): b, c, d — natural highways for the rooks and queen. Half-open for White: e.
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
34. Ra8 Qxa8 35. Qxa8+
为何奏效
- 好棋！车到a8保持压力（+4.6）。
- 好棋！后到a8保持压力（+4.8）。
- 你赢得一子——后。
- 若改走Qxa8，则Qxa8+，你赢得后。
Move by move
- 34. Ra8 — 车 to a8
- Qxa8 — 后 to a8 (capture)
- 35. Qxa8+ — 后 to a8 (capture) with check
本题的题型
静着
既不将军也不吃子——但正是这步不起眼的棋决定了胜负。
静着：既不将军也不吃子，却恰恰是它决定胜负——制造无法招架的威胁，或夺走国王最后的格子。这是最难的一类着法：眼睛总在搜寻轰鸣的重击，赢棋的却是一次低调的挪动。线索：所有强制尝试都撞上防守——那就找那步单纯加强威胁或抢占格子的棋。训练自己发问：如果不吃不将，只是静静地加强，会怎样？
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 006
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