牵制：王到f7
li-0LZQq战术主题
牵制：棋子一动，身后更有价值的目标就会暴露。
解救棋子：你的棋子正受攻击——找到最佳解救方法。
难度1815 ShuffleRating——适合进阶战术爱好者。
黑方走棋——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.
Here the task is defensive: one of your pieces is under attack and must be rescued without losing more. Look for a move that saves it with tempo — a counter-check, an equal counter-attack or an interposition — rather than a passive retreat.
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 e5, 马 f1, 兵 g2 d4。
黑方：王 f6, 车 c1, 马 e3, 兵 e4 f5 e6 g7 h7。
棋盘上有5枚白棋和8枚黑棋；该题局面出现在第38回合之后。
The position in numbers
White are ahead by 1 points of material (14 against 13; 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 f6.
It is Black to move on move 38, with 4 legal replies to weigh — only the line that keeps the advantage solves the puzzle. Black are in check right now, so every reply must answer the check.
White keeps 2 pawns, Black 5. Files fully open (no pawns of either colour): a, b, c — natural highways for the rooks and queen. Half-open for Black: d.
The Black king has 4 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
38... Kf7 39. Qb8 Rxf1+
为何奏效
- 最佳着法。王到f7正是引擎的选择（+1.9）。
- 好棋！车到f1保持压力（+3.2）。
- 你赢得一子——马。
- 若改走Qb8，则Rxf1+，你赢得马。
Move by move
- 38… Kf7 — 王 to f7
- 39. Qb8 — 后 to b8
- Rxf1+ — 车 to f1 (capture) with check
本题的题型
围猎被牵制子
被牵制的子逃不掉——再次攻击它，把它拿下。
被牵制的棋子无法逃跑——这意味着只要再攻击它一次，就能整个赢下它。数一数攻击者和防守者：如果进攻方更多，这个子就是你的了。最好的「第二攻击者」是兵：它比它能吃到的任何东西都便宜。别急着立刻吃——先加强压力，然后再收割。
后残局
开放棋盘上的皇后大战——精确高于一切。
后残局阴险难测：后无处不达，一个不准就把胜势变成长将和棋。主题特征：兵很少、王暴露、连环将军的味道飘在空中。提前把王藏好，并利用自己的将军带节奏地调后靠近、或推进通路兵。错误做法是只顾吃兵，把王丢给无穷无尽的将军。
救子
被攻击的子不但能救，还能顺手赚一笔。
救子：你的棋子被攻击，任务是别白白送掉它。办法有几种：带节奏地撤退、加以保护、垫挡攻击，或制造更凶的对攻威胁。机械后撤之前，先找带反击的撤退——既救了子又赚了时间。典型错误是惊慌失措逃到随便一个格子，结果棋子又被抓住。
来源
源自 Lichess 题库（CC0）。
题包 013
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