1步底线杀，e8
li-02pcX战术主题
底线：王被自己的兵困在底线——利用这一点。
悬子：对方有棋子无人保护——吃掉它。
一步将杀：找到让对方王无路可逃的一着棋。
难度952 ShuffleRating——适合初学者迈出Chess960战术的第一步。
白方走棋——找出最佳续着
How to recognize this tactic
A back-rank mate strikes when the king is boxed in by its own pawns and the back rank is under-defended. Check whether a rook or queen can reach the first rank with check and whether the only defender can be deflected or overloaded.
A hanging piece is one that is attacked and not defended, or defended too few times. Count attackers against defenders on each enemy unit; where attackers win, take it — often with an in-between move or a check to gain the extra tempo.
A mate in one hides among forcing checks. Run through every check you can give: does it cover all the king's escape squares, is the checking piece safe or supported, and can nothing block or capture it? If yes, that is the mate.
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 e1, 马 f3 c4, 兵 a2 c2 f2 g2 b3 h3。
黑方：王 g8, 后 f6, 车 b7 e8, 马 b4 f4, 兵 d4 c5 a7 f7 g7 h7。
棋盘上有12枚白棋和12枚黑棋；该题局面出现在第21回合之后。
The position in numbers
Material is level — 31 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on g1, the black king on g8.
It is White to move on move 21, with 39 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. Files fully open (no pawns of either colour): e — natural highways for the rooks and queen. Half-open for White: d.
The White king has 3 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
21. Rxe8#
为何奏效
- 好棋！车到e8保持压力（#）。
- 该变着以1步强制将杀结束。
Move by move
- 21. Rxe8# — 车 to e8 (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。
一步杀
一步将杀——把它找出来。
一步杀：组合已经落幕，只剩最后一发精准的子弹。方法很简单——列出你所有的将军，对每一个检验国王的三条生路：逃跑、垫挡、吃掉将军者。三条都行不通，那就是将杀。典型错误是爱上找到的第一个将军，漏掉那扇唯一的逃生小窗。
悬子
有个子没人保护——直接吃掉它。
悬子就是没有任何保护、可以白吃的棋子。听起来太初级，可业余棋局的多数胜负正是这样决定的。养成习惯：每步棋之前扫一遍全盘，标出所有无保护的棋子——自己的和对方的。典型的错误是在只需弯腰捡礼物的地方，苦苦寻找华丽的组合。
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 005
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