Back-rank mate in 3 on b1
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The tactical motive
Back rank: the king is trapped behind its own pawns — use that.
Fork: one piece attacks two targets at once — they can't both be saved.
Mate in 3: a forced sequence that ends in checkmate.
Difficulty 1182 ShuffleRating — club-player level.
Black 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.
A fork is one piece attacking two targets at once. Look for a knight, pawn or queen move that lands where it hits the king (or a bigger piece) and a second undefended unit on the same turn — the opponent can save only one.
In a mate in three every move must be forcing; the defender should never get a free tempo. Find the check or threat that herds the king, calculate the single defence to each, and confirm the net closes on the third move.
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 b6, rook b1 a3, bishop g3, knight d2 f3, pawn f2 g2 h2.
Black: king g8, queen d3, rook d8, bishop a6, knight c6, pawn b3 e6 f7 g7 h7.
10 white and 10 black pieces are on the board; the puzzle position arises after move 25.
The position in numbers
White are ahead by 6 points of material (31 against 25; 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 g8.
It is Black to move on move 25, with 47 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 3 pawns, Black 5. Files fully open (no pawns of either colour): a, c, d — natural highways for the rooks and queen.
The Black king has 2 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
25... Qxb1+ 26. Nxb1 Rd1+ 27. Ne1 Rxe1#
Why it works
- Great move! queen to b1 keeps the pressure (#2).
- Well found: rook to d1 (#1).
- Strong! rook to e1 is the sharp choice (#).
- The line ends in a forced mate in 3.
- If instead Nxb1, then Rd1+ and you stay on top.
Move by move
- 25… Qxb1+ — queen to b1 (capture) with check
- 26. Nxb1 — knight to b1 (capture)
- Rd1+ — rook to d1 with check
- 27. Ne1 — knight to e1
- Rxe1# — rook to e1 (capture) 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.
Only move
Everything else loses — find the only move that holds.
An only move is a position where everything loses except one single continuation. You cannot play "by hand" here: run through fundamentally different defenses — run away, block, trade, counterattack — and discard the ones that fail. The hallmark of these puzzles is that the obvious moves lose quickly while the solution often looks strange. First understand exactly what the threat is — then the one saving move reveals itself.
Mate in 3
A forced checkmate in three moves.
Mate in three is a forced staircase: each of your moves narrows the opponent's choices, and the third one ends the game. Look for the start among checks and sacrifices — quiet first moves are rare in mating problems, but deliciously sneaky. Keep the tree in your head: every defense gets its own branch. Do not stop calculating after move two — see the final mating picture with your own eyes.
Provenance
Derived from the Lichess puzzle database (CC0).
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 007
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