2步杀:牵制,f7 (c7)
li-0LuAt命名标签 (格·N)战术主题
两步将杀:第一步制造无法化解的威胁,第二步完成将杀。
牵制:棋子一动,身后更有价值的目标就会暴露。
难度1814 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
Mate in two usually opens with a forcing move — a check, a capture or an unstoppable threat — that strips the king of squares or defenders, so the follow-up mate becomes unavoidable. Look for the first move that leaves the opponent only losing replies.
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 h1, 后 c7, 车 d1 f1, 象 b3, 兵 c2 g2 h2 f3 a4 e4。
黑方:王 g8, 后 b2, 车 a8 f8, 象 c8, 马 f4, 兵 e5 a6 b7 f7 g7 h7。
棋盘上有11枚白棋和12枚黑棋;该题局面出现在第19回合之后。
The position in numbers
Black are ahead by 3 points of material (28 against 31; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h1, the black king on g8.
It is White to move on move 19, with 42 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. Files fully open (no pawns of either colour): d — natural highways for the rooks and queen. Half-open for White: b.
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
19. Qxf7+ Rxf7 20. Rd8#
为何奏效
- 好棋!后到f7保持压力(#1)。
- 好棋!车到d8保持压力(#)。
- 该变着以2步强制将杀结束。
- 若改走Rxf7,则Rd8#,即被将杀。
Move by move
- 19. Qxf7+ — 后 to f7 (capture) with check
- Rxf7 — 车 to f7 (capture)
- 20. Rd8# — 车 to d8 and it is checkmate
本题的题型
底线杀
王被自己的兵关在里面——重子直捣底线。
底线杀:国王被自己一排未动的兵关在后面,车或后突入底线一锤定音。识别特征:王前的兵没动过、没有通气口,底线只有一个守卫,甚至无人看守。常见手法是先引开或兑掉那个孤独的哨兵,再沿线突击。在自己的对局中要及时开气孔:一步兵着就能免除一场突发灾难。
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。
两步杀
两步之内的强制将杀。
两步杀:你走一步,对方任意应一步,然后是致命一击。从最强制的首着开始:将军和弃子,把对手的选择压到最少。对他的每一种应法,你都必须备好将杀——所有回应都要检查,一个不漏。常见的失误是算清了漂亮的防守,却忘了那个平淡无奇的。
来源
源自 Lichess 题库(CC0)。
题包 013
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