牵制：兵到f4
li-0EUlY战术主题
闪击：一子闪开，另一子的攻击随之而来。
牵制：棋子一动，身后更有价值的目标就会暴露。
难度1830 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
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 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 f2, 后 h5, 马 a2, 兵 b2 f3 h3 b4。
黑方：王 e5, 后 d1, 象 c1 f5, 马 d5, 兵 h4 a6 g7。
棋盘上有7枚白棋和8枚黑棋；该题局面出现在第52回合之后。
The position in numbers
Black are ahead by 5 points of material (16 against 21; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on f2, the black king on e5.
It is White to move on move 52, with 16 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 3. Files fully open (no pawns of either colour): c, d, e — natural highways for the rooks and queen. Half-open for White: a, g.
Black hold the bishop pair, an edge in open lines. The White king has 1 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
52. f4+ Bxf4 53. Qxd1
为何奏效
- 好棋！兵到f4保持压力（+2.0）。
- 好棋！后到d1保持压力（+2.3）。
- 你赢得一子——后。
- 若改走Bxf4，则Qxd1，你赢得后。
Move by move
- 52. f4+ — 兵 to f4 with check
- Bxf4 — 象 to f4 (capture)
- 53. Qxd1 — 后 to d1 (capture)
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。
腾挪
带着先手把自己的子挪开，为决定性一击腾出线路。
让路：决定性打击被你自己的棋子挡住了——那就把它挪开，甚至干脆送掉。关键是带节奏地让路：闪开时带着将军、吃子或威胁，让对手来不及重新布防。识别特征：你看到后或车有一记好杀招，但需要的线路或格子被自己的棋子占着。别舍不得——让路的弃子通常比错失的攻势便宜得多。
来源
源自 Lichess 题库（CC0）。
题包 013
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