牵制：车到f7 (f1)
li-0KOvd命名标签 (格·N)战术主题
引离：迫使防守的棋子离开岗位。
牵制：棋子一动，身后更有价值的目标就会暴露。
难度2093 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
Deflection drags a defender away from its duty. Identify the enemy piece that guards a key square or mate, then force it to move — with a check, a capture or a threat it must answer — and strike where it no longer defends.
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 h1, 后 d2, 车 f1, 象 e4, 兵 b3 d3 h3 a4 d5。
黑方：王 h7, 后 h5, 象 g3 g6, 马 g8, 兵 c5 a6 b6 h6。
棋盘上有9枚白棋和9枚黑棋；该题局面出现在第40回合之后。
The position in numbers
Material is level — 22 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on h1, the black king on h7.
It is White to move on move 40, with 41 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 4. Files fully open (no pawns of either colour): e, f, g — natural highways for the rooks and queen. Half-open for White: c.
Black hold the bishop pair, an edge in open lines. 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
40. Rf7+ Kh8 41. Bxg6 Qxh3+ 42. Kg1
为何奏效
- 好棋！车到f7保持压力（+3.9）。
- 好棋！象到g6保持压力（+4.7）。
- 好棋！王到g1保持压力（+5.2）。
- 你赢得决定性子力（+5.2）。
- 若改走Kh8，则Bxg6，你赢得象。
Move by move
- 40. Rf7+ — 车 to f7 with check
- Kh8 — 王 to h8
- 41. Bxg6 — 象 to g6 (capture)
- Qxh3+ — 后 to h3 (capture) with check
- 42. Kg1 — 王 to g1
本题的题型
绝对牵制
一个子被牵制在王前——按规则它根本不能动。
绝对牵制：一个棋子被冻结在自己国王与你的远程棋子之间的直线上——按规则它根本不许移动。特征是三个单位排在一条直线上：你的象、车或后，敌方棋子，以及它身后的敌方国王。被牵制的棋子既不能进攻也不能防守，就当它不在棋盘上。放心地再次攻击它，最好用兵——它无权逃跑。
来源
源自 Lichess 题库（CC0）。
题包 015
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