3步杀：捉双，e8
li-04hnN战术主题
引离：迫使防守的棋子离开岗位。
捉双：一子同时攻击两个目标——无法两全。
三步将杀：一段以将杀收尾的强制着法。
难度1196 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 fork is one piece attacking two targets at once. Look for a knight, pawn or queen move that lands where it hits the king (or a bigger piece) and a second undefended unit on the same turn — the opponent can save only one.
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 h2, 后 c6, 马 e5, 兵 f2 g2 h3 e4。
黑方：王 g8, 后 a6, 车 a1 b2, 象 e7, 兵 d4 c5 b6 f7 g7 h7。
棋盘上有7枚白棋和11枚黑棋；该题局面出现在第38回合之后。
The position in numbers
Black are ahead by 12 points of material (16 against 28; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h2, the black king on g8.
It is White to move on move 38, with 29 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 6. Files fully open (no pawns of either colour): a — natural highways for the rooks and queen. Half-open for White: b, c, d.
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
38. Qe8+ Bf8 39. Qxf7+ Kh8 40. Qxf8#
为何奏效
- 好棋！后到e8保持压力（#2）。
- 好棋！后到f7保持压力（#1）。
- 好棋！后到f8保持压力（#）。
- 该变着以3步强制将杀结束。
- 若改走Bf8，则Qxf7+，你仍占优。
Move by move
- 38. Qe8+ — 后 to e8 with check
- Bf8 — 象 to f8
- 39. Qxf7+ — 后 to f7 (capture) with check
- Kh8 — 王 to h8
- 40. Qxf8# — 后 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。
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 007
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