1步杀:牵制,g1
li-0HSTS战术主题
一步将杀:找到让对方王无路可逃的一着棋。
牵制:棋子一动,身后更有价值的目标就会暴露。
难度1828 ShuffleRating——适合进阶战术爱好者。
黑方走棋——找出最佳续着
How to recognize this tactic
A mate in one hides among forcing checks. Run through every check you can give: does it cover all the king's escape squares, is the checking piece safe or supported, and can nothing block or capture it? If yes, that is the mate.
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 f1, 后 d1, 车 a1 e1, 象 e2, 马 f3 e4, 兵 h2 a3 b3 c4 d6。
黑方:王 g7, 后 g5, 车 a8 f8, 马 h3 c6, 兵 b4 a5 c5 g6 h6。
棋盘上有12枚白棋和11枚黑棋;该题局面出现在第25回合之后。
The position in numbers
White are ahead by 3 points of material (33 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 f1, the black king on g7.
It is Black to move on move 25, with 49 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 Black: d.
The Black king has 4 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
25... Qg1#
为何奏效
- 好棋!后到g1保持压力(#)。
- 该变着以1步强制将杀结束。
Move by move
- 25… Qg1# — 后 to g1 and it is checkmate
本题的题型
护卫后杀
皇后贴脸将杀,身后有自己人保护。
有保护的贴身后杀是最常见的将杀图案:后紧贴国王落子,因为有己方棋子或兵保护而成杀。国王无处可逃:吃后不行——那格有保护,而周围所有格子后亲自看管。寻找敌王旁边受保护的格子:有马、象或兵控制它,后的登陆就成了将杀。只需核实一件事:那个格子真有保护,否则国王会直接吃掉后。
一步杀
一步将杀——把它找出来。
一步杀:组合已经落幕,只剩最后一发精准的子弹。方法很简单——列出你所有的将军,对每一个检验国王的三条生路:逃跑、垫挡、吃掉将军者。三条都行不通,那就是将杀。典型错误是爱上找到的第一个将军,漏掉那扇唯一的逃生小窗。
绝对牵制
一个子被牵制在王前——按规则它根本不能动。
绝对牵制:一个棋子被冻结在自己国王与你的远程棋子之间的直线上——按规则它根本不许移动。特征是三个单位排在一条直线上:你的象、车或后,敌方棋子,以及它身后的敌方国王。被牵制的棋子既不能进攻也不能防守,就当它不在棋盘上。放心地再次攻击它,最好用兵——它无权逃跑。
来源
源自 Lichess 题库(CC0)。
题包 013
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