吃掉无保护的后（f2）
li-0Ntb3战术主题
悬子：对方有棋子无人保护——吃掉它。
难度1994 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 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 f6, 后 b6, 马 d6, 兵 b2 c2 d3 g3 e4。
黑方：王 b8, 后 f2, 车 d1 g8, 兵 e5 c6 b7。
棋盘上有8枚白棋和7枚黑棋；该题局面出现在第44回合之后。
The position in numbers
Black are ahead by 5 points of material (17 against 22; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on f6, the black king on b8.
It is White to move on move 44, with 5 legal replies to weigh — only the line that keeps the advantage solves the puzzle. White are in check right now, so every reply must answer the check.
White keeps 5 pawns, Black 3. Files fully open (no pawns of either colour): a, f, h — natural highways for the rooks and queen.
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
44. Qxf2 Rf8+ 45. Nf7
为何奏效
- 好棋！后到f2保持压力（+5.8）。
- 好棋！马到f7保持压力（+5.8）。
- 你赢得一子——后。
- 若改走Rf8+，则Nf7，你赢得后。
Move by move
- 44. Qxf2 — 后 to f2 (capture)
- Rf8+ — 车 to f8 with check
- 45. Nf7 — 马 to f7
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。
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。
来源
源自 Lichess 题库（CC0）。
题包 014
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