2步杀：兵到b4
li-00HzR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。
难度897 ShuffleRating——适合初学者迈出Chess960战术的第一步。
黑方走棋——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.
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 c3, 车 f3, 兵 b3 d3 g3 h4。
黑方：王 d6, 车 h2, 兵 b5 c5 a6。
棋盘上有6枚白棋和5枚黑棋；该题局面出现在第46回合之后。
The position in numbers
White are ahead by 1 points of material (9 against 8; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on c3, the black king on d6.
It is Black to move on move 46, with 20 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 3. Files fully open (no pawns of either colour): e, f — natural highways for the rooks and queen. Half-open for Black: d, g, h.
The Black king has 7 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
46... b4+ 47. Kc4 Rc2#
为何奏效
- 好棋！兵到b4保持压力（#1）。
- 好棋！车到c2保持压力（#）。
- 该变着以2步强制将杀结束。
- 若改走Kc4，则Rc2#，即被将杀。
Move by move
- 46… b4+ — 兵 to b4 with check
- 47. Kc4 — 王 to c4
- Rc2# — 车 to c2 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。
车残局
最常见的残局——一切取决于子力的活跃度。
车残局是实战中最常见的残局：盘上是车和兵。第一法则是积极性：站在通路兵身后的车，胜过消极守兵的车。正确计划的标志——你的车在攻击什么，而不是在看守什么。错误做法是把车锁死在护兵岗位上：常常宁可丢一兵，也要保住活跃的车和活跃的王。
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 004
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