捉双：象到d5 (g2)
li-0OUI2命名标签 (格·N)战术主题
引离：迫使防守的棋子离开岗位。
捉双：一子同时攻击两个目标——无法两全。
悬子：对方有棋子无人保护——吃掉它。
难度1956 ShuffleRating——适合进阶战术爱好者。
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 fork is one piece attacking two targets at once. Look for a knight, pawn or queen move that lands where it hits the king (or a bigger piece) and a second undefended unit on the same turn — the opponent can save only one.
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.
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 b7, 车 a1, 象 g2, 马 d2 e5, 兵 b2 c3 d3 g3 a4。
黑方：王 g8, 后 g5, 车 a8 f8, 象 d5, 马 c6, 兵 d4 a7 c7 g7 h7。
棋盘上有11枚白棋和11枚黑棋；该题局面出现在第21回合之后。
The position in numbers
Black are ahead by 2 points of material (28 against 30; 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 g8.
It is White to move on move 21, with 45 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): e, f — natural highways for the rooks and queen. Half-open for White: h.
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
21. Bxd5+ Kh8 22. Nf7+ Rxf7 23. Qxa8+
为何奏效
- 好棋！象到d5保持压力（+6.5）。
- 好棋！马到f7保持压力（+6.9）。
- 好棋！后到a8保持压力（+6.9）。
- 你赢得一子——车。
- 若改走Kh8，则Nf7+，你赢得象。
Move by move
- 21. Bxd5+ — 象 to d5 (capture) with check
- Kh8 — 王 to h8
- 22. Nf7+ — 马 to f7 with check
- Rxf7 — 车 to f7 (capture)
- 23. Qxa8+ — 后 to a8 (capture) with check
本题的题型
引离
把防守者从岗位上引开——再攻击它守护的目标。
引离：你迫使守卫离开岗位——用弃子或交换把它从它保护的棋子或格子旁拽走。先找出关键的看守者：少了它，防杀或保子的体系就会崩塌。然后找一步它无法置之不理的棋——最常见的是吃子。别心疼子力：如果守卫离开后你能做杀或吃后，这笔投资会加倍收回。
唯一着法
其他任何一步都会输——找到唯一撑得住的那一步。
唯一着法：除了独一无二的那步棋，其余全输的局面。这里不能「顺手」下棋：把原则上不同的防守都过一遍——逃跑、垫挡、兑换、反击——再淘汰被驳倒的。这类题目的标志：显而易见的着法很快就输，而正解常常看起来古怪。先弄清威胁你的究竟是什么——那步唯一的防守自会现身。
反击
别忙着防守——用更大的威胁回敬对手。
反击：面对威胁你的回应不是防守，而是自己的威胁——更强的那种。趁对手吃你的兵，你宣布将杀：这笔账算在你这边。当直接防守都不好时寻找反击：你有没有将军、攻后的手段、做杀的威胁？新手的错误是对每个威胁都条件反射地防守，从不先查一查对攻资源。
来源
源自 Lichess 题库（CC0）。
题包 014
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