Back-rank mate in 2 on c8 (a6)
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The tactical motive
Back rank: the king is trapped behind its own pawns — use that.
Mate in 2: the first move creates an unstoppable threat, the second delivers mate.
Difficulty 1002 ShuffleRating — club-player level.
White to move — find the best continuation
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.
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.
Position on the board
White: king g1, queen a6, rook d1 f1, knight f2, pawn a2 g2 h2 c4 e5.
Black: king g8, queen e3, rook b4 c8, bishop e6, pawn b3 c5 f7 g7 h7.
10 white and 10 black pieces are on the board; the puzzle position arises after move 26.
The position in numbers
Material is level — 27 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 26, with 32 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 5. Files fully open (no pawns of either colour): d — natural highways for the rooks and queen. Half-open for White: b, f.
The White king has 1 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
26. Qxc8+ Bxc8 27. Rd8#
Why it works
- Great move! queen to c8 keeps the pressure (#1).
- Well found: rook to d8 (#).
- The line ends in a forced mate in 2.
- If instead Bxc8, then Rd8# and it is mate.
Move by move
- 26. Qxc8+ — queen to c8 (capture) with check
- Bxc8 — bishop to c8 (capture)
- 27. Rd8# — rook to d8 and it is checkmate
Types in this puzzle
Back-rank mate
The king is locked behind its own pawns — a heavy piece strikes the last rank.
The back-rank mate strikes a king locked behind its own unmoved pawns when a rook or queen crashes onto the last rank. The signs: no escape hole in front of the king, and the back rank guarded by a single piece or by nobody at all. Often that lone guard is deflected or traded off first, and only then comes the invasion. In your own games, make luft in time — one pawn move prevents a sudden catastrophe.
Mate in 2
A forced checkmate in two moves.
Mate in two: your move, any reply, then the mating blow. Start with the most forcing first moves — checks and sacrifices that shrink the opponent's options to almost nothing. Against every single reply you must have a mate ready, so check them all without exception. The common failure is analyzing the pretty defense and forgetting the boring one.
Royal fork
A fork with check: the king must move, and the second piece is lost.
A royal fork is a fork with check — one of the two targets is the king itself. The check must be answered first, so nobody is left to rescue the second piece. Look for squares where your piece gives check and simultaneously attacks an undefended queen or rook. It is the most reliable fork of all, because your opponent literally has no choice.
Provenance
Derived from the Lichess puzzle database (CC0).
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 006
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