牵制：王到g7
li-07dRY战术主题
悬子：对方有棋子无人保护——吃掉它。
牵制：棋子一动，身后更有价值的目标就会暴露。
难度1706 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 hanging piece is one that is attacked and not defended, or defended too few times. Count attackers against defenders on each enemy unit; where attackers win, take it — often with an in-between move or a check to gain the extra tempo.
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 e2, 后 c2, 车 h1 g7, 马 h4, 兵 a2 b2 f2 c3 e3 d4。
黑方：王 g8, 后 e6, 车 a8 f8, 马 c6, 兵 f4 d5 a6 h6 b7 c7。
棋盘上有11枚白棋和11枚黑棋；该题局面出现在第20回合之后。
The position in numbers
Material is level — 28 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on e2, the black king on g8.
It is Black to move on move 20, with 2 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 6 pawns, Black 6. Files fully open (no pawns of either colour): g — natural highways for the rooks and queen. Half-open for Black: e.
The Black 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
20... Kxg7 21. Rg1+ Kf7 22. Qh7+ Ke8
为何奏效
- 好棋！王到g7保持压力（+3.0）。
- 好棋！王到f7保持压力（+3.1）。
- 好棋！王到e8保持压力（+3.4）。
- 你赢得一子——车。
- 若改走Rg1+，则Kf7，你赢得车。
Move by move
- 20… Kxg7 — 王 to g7 (capture)
- 21. Rg1+ — 车 to g1 with check
- Kf7 — 王 to f7
- 22. Qh7+ — 后 to h7 with check
- Ke8 — 王 to e8
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。
解杀
杀棋已成威胁——化解它并保持优势。
解杀：对手离将杀只差一步——但现在轮到你走，这改变了一切。寻找既解除杀棋威胁又保住你优势的防守：常常是一步将军或反威胁，让对方腾不出手来做杀。先准确说出对方要在哪个格子将杀你——否则就是蒙着眼防守。错误做法是走一步实际并没有解除威胁的「防守」。
王的撤离
王迈开自己的脚步走出危险区。
国王撤离：掩体既已坍塌，王就徒步走出攻击区——有时要横穿半个棋盘。一连串精确的王着把他带出火力圈，对手的攻势随之消散。识别特征：没有一种直接防守管用，但存在一条经过安全格、通往棋盘僻静角落的路线。要提前算好全程——半路抛锚的王通常就死在半路。
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 013
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