3步杀：牵制，g7
li-01B5q战术主题
双重攻击：一步棋同时制造两个威胁。
三步将杀：一段以将杀收尾的强制着法。
牵制：棋子一动，身后更有价值的目标就会暴露。
难度2086 ShuffleRating——专家水平——很少有人一次解出。
白方走棋——找出最佳续着
How to recognize this tactic
A double attack threatens two things at once so the opponent cannot parry both. Look for a single move — often a queen or knight — that creates two separate threats, such as a check plus an attack on a loose piece.
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.
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 f6, 车 g2, 象 f1 b2, 马 d4, 兵 a4 h5。
黑方：王 g8, 后 e4, 车 a8 f8, 马 d5, 兵 a6 g6 b7 c7 f7 h7。
棋盘上有8枚白棋和11枚黑棋；该题局面出现在第37回合之后。
The position in numbers
Black are ahead by 3 points of material (25 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 h1, the black king on g8.
It is White to move on move 37, with 40 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 2 pawns, Black 6. Files fully open (no pawns of either colour): d, e — natural highways for the rooks and queen. Half-open for White: b, c, f, g.
White hold the bishop pair, an edge in open lines. The White king has 2 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
37. Qg7+ Kxg7 38. Nf5+ Kg8 39. Nh6#
为何奏效
- 好棋！后到g7保持压力（#2）。
- 好棋！马到f5保持压力（#1）。
- 好棋！马到h6保持压力（#）。
- 该变着以3步强制将杀结束。
- 若改走Kxg7，则Nf5+，你仍占优。
Move by move
- 37. Qg7+ — 后 to g7 with check
- Kxg7 — 王 to g7 (capture)
- 38. Nf5+ — 马 to f5 with check
- Kg8 — 王 to g8
- 39. Nh6# — 马 to h6 and it is checkmate
本题的题型
马杀
马以它独一无二的角度送出致命一击。
马杀：最后一击由马完成——它是唯一无法用垫挡化解将军的棋子。正因如此，马对被挤住的国王格外致命：只有走王或吃掉马本身才有救。识别特征：国王周围的格子被占据或受控，而存在一个马能安然无恙地跳过去将军的格子。提前把马调往前线：它比远程棋子慢，但它的打击无法招架。
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 015
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