吃掉无保护的马（c4）
li-038W6战术主题
悬子：对方有棋子无人保护——吃掉它。
难度1419 ShuffleRating——俱乐部棋手水平。
白方走棋——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.
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 e3, 车 a1 f1, 象 g2, 马 c3 e5, 兵 b2 a3 h3 f4 g4。
黑方：王 g8, 后 e7, 车 b8 f8, 象 c4, 马 f6 d7, 兵 c5 a7 b7 f7 g7 h7。
棋盘上有12枚白棋和13枚黑棋；该题局面出现在第20回合之后。
The position in numbers
Black are ahead by 1 points of material (33 against 34; 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 20, with 52 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 6. Files fully open (no pawns of either colour): d, e — natural highways for the rooks and queen. Half-open for White: c.
The White 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
20. Nxc4 Qxe3+ 21. Nxe3
为何奏效
- 好棋！马到c4保持压力（+4.7）。
- 好棋！马到e3保持压力（+4.7）。
- 你赢得一子——后。
- 若改走Qxe3+，则Nxe3，你赢得后。
Move by move
- 20. Nxc4 — 马 to c4 (capture)
- Qxe3+ — 后 to e3 (capture) with check
- 21. Nxe3 — 马 to e3 (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。
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 010
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