Back-rank mate in 3 on f2 (f7·2)
li-033rGnaming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Back rank: the king is trapped behind its own pawns — use that.
Deflection: force the defender to abandon its post.
Mate in 3: a forced sequence that ends in checkmate.
Difficulty 1178 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.
Deflection drags a defender away from its duty. Identify the enemy piece that guards a key square or mate, then force it to move — with a check, a capture or a threat it must answer — and strike where it no longer defends.
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 d6, rook d1, knight f1, pawn g2 h2 b4 c5.
Black: king h8, queen f7, rook f8, bishop g7, pawn g6 b7 h7.
8 white and 7 black pieces are on the board; the puzzle position arises after move 29.
The position in numbers
White are ahead by 1 points of material (21 against 20; 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 h8.
It is Black to move on move 29, with 35 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): a, d, e, f — natural highways for the rooks and queen. Half-open for Black: c.
The Black king has 1 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
29... Qf2+ 30. Kh1 Qxf1+ 31. Rxf1 Rxf1#
Why it works
- Great move! queen to f2 keeps the pressure (#2).
- Well found: queen to f1 (#1).
- Strong! rook to f1 is the sharp choice (#).
- The line ends in a forced mate in 3.
- If instead Kh1, then Qxf1+ and you win the knight.
Move by move
- 29… Qf2+ — queen to f2 with check
- 30. Kh1 — king to h1
- Qxf1+ — queen to f1 (capture) with check
- 31. Rxf1 — rook to f1 (capture)
- Rxf1# — rook to f1 (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.
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.
Corner mate
Driven into the corner, the king runs out of squares.
The corner mate catches a king driven into the corner, where it has only three neighboring squares — all of them taken away or blocked. The corner is the worst home for a king, because the attacker needs to control the fewest squares there. Herd the king toward the corner with checks and never let it slip back toward the center. Cut off the escape routes before the final check, and the mate practically assembles itself.
Provenance
Derived from the Lichess puzzle database (CC0).
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 007
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