2步杀：双重攻击，f8
li-05bmj战术主题
引离：迫使防守的棋子离开岗位。
双重攻击：一步棋同时制造两个威胁。
两步将杀：第一步制造无法化解的威胁，第二步完成将杀。
难度1651 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
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 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.
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.
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, 车 g6 a8, 兵 g3 g7。
黑方：王 g8, 后 b1, 车 c4 f7, 象 f8, 兵 a3 f6。
棋盘上有5枚白棋和7枚黑棋；该题局面出现在第42回合之后。
The position in numbers
Black are ahead by 12 points of material (12 against 24; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g2, the black king on g8.
It is White to move on move 42, with 23 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 2 pawns, Black 2. Files fully open (no pawns of either colour): b, c, d, e, h — natural highways for the rooks and queen. Half-open for White: a, f.
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
42. gxf8=Q+ Kh7 43. Qxf7#
为何奏效
- 好棋！兵到f8保持压力（#1）。
- 最佳着法。后到f7正是引擎的选择（#）。
- 该变着以2步强制将杀结束。
- 若改走Kh7，则Qxf7#，即被将杀。
Move by move
- 42. gxf8=Q+ — 兵 to f8 (capture) with check
- Kh7 — 王 to h7
- 43. Qxf7# — 后 to f7 (capture) and it is checkmate
本题的题型
天梯杀
两个重子一线一线地推进，切断所有退路。
阶梯杀（线性杀）：两枚重子像爬梯子一样协作——一枚沿一条线切断国王，另一枚在相邻线上将军，一步步把他逼向棋盘边缘。这是双车的经典技巧：将军，国王退一排，另一只车再将军——直到底线将杀。唯一的危险是国王贴近来攻击你的车。真遇上了，把那只车平移到同一条线的远端即可。
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）。
经 Stockfish 深度 20+ 验证。
解法强制性已确认（verified）。
题包 013
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