3步杀：引离，d8
li-024sp战术主题
引离：迫使防守的棋子离开岗位。
悬子：对方有棋子无人保护——吃掉它。
三步将杀：一段以将杀收尾的强制着法。
难度1412 ShuffleRating——俱乐部棋手水平。
白方走棋——找出最佳续着
How to recognize this tactic
Deflection drags a defender away from its duty. Identify the enemy piece that guards a key square or mate, then force it to move — with a check, a capture or a threat it must answer — and strike where it no longer defends.
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.
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 g1, 车 a1 d1, 马 f3 b5, 兵 b2 f2 g2 h2 b3。
黑方：王 b8, 后 e2, 车 d8 h8, 象 f8, 马 f6 a7, 兵 h6 b7 c7 f7 g7。
棋盘上有10枚白棋和12枚黑棋；该题局面出现在第17回合之后。
The position in numbers
Black are ahead by 12 points of material (21 against 33; 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 b8.
It is White to move on move 17, with 37 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): a, d, e — natural highways for the rooks and queen. Half-open for White: c.
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
17. Rxd8+ Nc8 18. Ra8+ Kxa8 19. Rxc8#
为何奏效
- 好棋！车到d8保持压力（#2）。
- 好棋！车到a8保持压力（#1）。
- 好棋！车到c8保持压力（#）。
- 该变着以3步强制将杀结束。
- 若改走Nc8，则Ra8+，你赢得车。
Move by move
- 17. Rxd8+ — 车 to d8 (capture) with check
- Nc8 — 马 to c8
- 18. Ra8+ — 车 to a8 with check
- Kxa8 — 王 to a8 (capture)
- 19. Rxc8# — 车 to c8 (capture) and it is checkmate
本题的题型
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。
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。
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。
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
相似题目
在浏览器或 Android 应用中。无需安装 · 免费，无广告