3步底线杀,f7 (f5)
li-00gH0命名标签 (格·N)战术主题
底线:王被自己的兵困在底线——利用这一点。
三步将杀:一段以将杀收尾的强制着法。
难度1347 ShuffleRating——俱乐部棋手水平。
白方走棋——找出最佳续着
How to recognize this tactic
A back-rank mate strikes when the king is boxed in by its own pawns and the back rank is under-defended. Check whether a rook or queen can reach the first rank with check and whether the only defender can be deflected or overloaded.
In a mate in three every move must be forcing; the defender should never get a free tempo. Find the check or threat that herds the king, calculate the single defence to each, and confirm the net closes on the third move.
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 g2, 后 f5, 车 f2, 兵 h2 g3 d4。
黑方:王 g8, 后 c3, 车 d8, 兵 c4 g7 h7。
棋盘上有6枚白棋和6枚黑棋;该题局面出现在第36回合之后。
The position in numbers
Material is level — 17 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on g2, the black king on g8.
It is White to move on move 36, with 39 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 3 pawns, Black 3. Files fully open (no pawns of either colour): a, b, e, f — natural highways for the rooks and queen. Half-open for White: c.
The White 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
36. Qf7+ Kh8 37. Qf8+ Rxf8 38. Rxf8#
为何奏效
- 好棋!后到f7保持压力(#2)。
- 好棋!后到f8保持压力(#1)。
- 好棋!车到f8保持压力(#)。
- 该变着以3步强制将杀结束。
- 若改走Kh8,则Qf8+,你仍占优。
Move by move
- 36. Qf7+ — 后 to f7 with check
- Kh8 — 王 to h8
- 37. Qf8+ — 后 to f8 with check
- Rxf8 — 车 to f8 (capture)
- 38. Rxf8# — 车 to f8 (capture) 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。
三步杀
三步之内的强制将杀。
三步杀是一道强制的阶梯:你的每一步都收窄对手的选择,第三步画上句号。到将军和弃子中寻找开局之着:杀题里安静的首着虽少见,却格外阴险。脑中要有变化树:每种防守对应自己的分支。别在第二步就停下——最终的将杀图景必须亲眼算到。
角落杀
被逼进角落的王,再也没有落脚的格子。
角落杀:国王被赶进棋盘一角,那里他只有三个相邻格——而它们全被夺走或占据。角落是国王最糟糕的住所:进攻方需要控制的格子最少。用将军把国王往角落里赶,绝不让他溜回中心。在最后一击之前切断所有逃亡路线——将杀几乎会自己成形。
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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