捉双：王到f3
li-0VtMx战术主题
闪击：一子闪开，另一子的攻击随之而来。
捉双：一子同时攻击两个目标——无法两全。
解救棋子：你的棋子正受攻击——找到最佳解救方法。
难度2350 ShuffleRating——专家水平——很少有人一次解出。
黑方走棋——找出最佳续着
How to recognize this tactic
A discovered attack fires when one piece steps aside and unmasks the piece behind it. Look for your own units that block a rook, bishop or queen: moving the front piece — ideally with a threat of its own — springs two attacks in one move.
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.
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 b4, 车 e1, 象 d2, 兵 b5。
黑方：王 e4, 车 c2, 象 d4, 兵 d3。
棋盘上有4枚白棋和4枚黑棋；该题局面出现在第47回合之后。
The position in numbers
Material is level — 9 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on b4, the black king on e4.
It is Black to move on move 47, 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 1 pawns, Black 1. Files fully open (no pawns of either colour): a, c, e, f, g, h — natural highways for the rooks and queen. Half-open for Black: b.
The Black king has 3 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
47... Kf3 48. Bg5 Bc3+ 49. Kc4 Bxe1+
为何奏效
- 好棋！王到f3保持压力（+3.9）。
- 好棋！象到c3保持压力（+4.9）。
- 好棋！象到e1保持压力（+5.0）。
- 你赢得一子——车。
- 若改走Bg5，则Bc3+，你仍占优。
Move by move
- 47… Kf3 — 王 to f3
- 48. Bg5 — 象 to g5
- Bc3+ — 象 to c3 with check
- 49. Kc4 — 王 to c4
- Bxe1+ — 象 to e1 (capture) with check
本题的题型
王室捉双
带将军的捉双：王必须躲开，另一个子就丢了。
王家捉双是带将军的捉双：两个目标之一是国王本身。国王必须首先应将，因此没有人、也没有时间去救第二个棋子。寻找这样的格子：你的棋子从那里将军，同时攻击无保护的后或车。这是最可靠的捉双——对手根本没有选择的余地。
残局战术
残局里同样有战术——子力稀少时照样出击。
战术不会随着后的兑换而退休：捉双、牵制和双重攻击在残局里照样活跃。子力所剩无几，因此这里每一次战术损失几乎都直接定胜负。特征还是老几样：无保护的棋子、王与棋子同线、即将升变的兵。建议：即使在「纯技术」残局里，每步棋前也要搜一遍战术——自己的和对方的。
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 015
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