牵制：兵到d8
li-03I4O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1396 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 h3, 后 c7, 象 b5, 兵 f2 g3 c4 h4 d7。
黑方：王 g7, 后 d4, 车 f7, 兵 e4 c5 h5 b6 g6。
棋盘上有8枚白棋和8枚黑棋；该题局面出现在第53回合之后。
The position in numbers
Black are ahead by 2 points of material (17 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 h3, the black king on g7.
It is White to move on move 53, with 23 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 5. Files fully open (no pawns of either colour): a — natural highways for the rooks and queen. Half-open for White: b, e.
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
53. d8=Q Rxc7 54. Qxc7+
为何奏效
- 好棋！兵到d8保持压力（+5.2）。
- 好棋！后到c7保持压力（+5.2）。
- 你赢得一子——车。
- 若改走Rxc7，则Qxc7+，你赢得车。
Move by move
- 53. d8=Q — 兵 to d8
- Rxc7 — 车 to c7 (capture)
- 54. Qxc7+ — 后 to c7 (capture) with check
本题的题型
闪击
一个子闪开，让后面的子发起第二重攻击。
闪击就像拉开幕布：一个棋子离开直线，露出身后的远程棋子发动打击。妙处在于，走开的那个棋子自己还能攻击第二个目标——一步棋，两记重拳。检查你的叠置组合：马或兵的身后站着象或车，透过它们瞄准对方值钱的东西。前面的棋子要跳到最有攻击性的格子——没有第二威胁的闪击损失一半威力。
升变
兵冲到底线升变为后——一锤定音。
升变：兵抵达底线变成后，整个局面的评估瞬间改写。在战术中，通路兵很少能白白走到底——通常要靠弃子为它开路。计算节奏：兵到升变格还差几步，防守方来得及拦截吗？还要盯住升变格本身——它必须在敌子够不着的地方，或能被你的组合强行夺下。
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 010
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