2步杀：牵制，b3
li-0CMY3战术主题
两步将杀：第一步制造无法化解的威胁，第二步完成将杀。
牵制：棋子一动，身后更有价值的目标就会暴露。
难度1938 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
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.
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 g1, 后 d1, 车 a1 f1, 象 h6, 马 b1, 兵 a2 b2 g2 h2 c3 d4 e4。
黑方：王 f7, 后 d8, 车 a8 e8, 象 e7, 马 f6 d7, 兵 d6 g6 a7 b7 c7 h7。
棋盘上有13枚白棋和13枚黑棋；该题局面出现在第14回合之后。
The position in numbers
Black are ahead by 2 points of material (32 against 34; 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 f7.
It is White to move on move 14, with 39 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 6. Files fully open (no pawns of either colour): f — natural highways for the rooks and queen.
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
14. Qb3+ d5 15. Qxd5#
为何奏效
- 好棋！后到b3保持压力（#1）。
- 好棋！后到d5保持压力（#）。
- 该变着以2步强制将杀结束。
- 若改走d5，则Qxd5#，即被将杀。
Move by move
- 14. Qb3+ — 后 to b3 with check
- d5 — 兵 to d5
- 15. Qxd5# — 后 to d5 (capture) and it is checkmate
本题的题型
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。
围猎被牵制子
被牵制的子逃不掉——再次攻击它，把它拿下。
被牵制的棋子无法逃跑——这意味着只要再攻击它一次，就能整个赢下它。数一数攻击者和防守者：如果进攻方更多，这个子就是你的了。最好的「第二攻击者」是兵：它比它能吃到的任何东西都便宜。别急着立刻吃——先加强压力，然后再收割。
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 014
相似题目
在浏览器或 Android 应用中。无需安装 · 免费，无广告