Mate in 3: rook to f1 (b1)
c9-14812naming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Chess960 twist: use the unusual starting setup of the pieces.
Mate in 3: a forced sequence that ends in checkmate.
Difficulty 1980 ShuffleRating — for advanced tacticians.
White to move — find the best continuation
How to recognize this tactic
In Chess960 the pieces start on unfamiliar squares, so tactics appear earlier and from unusual angles. Do not trust classical patterns — read the actual lines of the bishops, the rooks and the queen from where they really stand in this position.
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, rook b1 b6, bishop c3, knight b5, pawn e2 b3 g3 h4.
Black: king f5, rook d2, knight c5, pawn e3 g4 a5 h5.
9 white and 7 black pieces are on the board; the puzzle position arises after move 36.
The position in numbers
White are ahead by 8 points of material (20 against 12; 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 f5.
It is White to move on move 36, with 35 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 4. Files fully open (no pawns of either colour): c, d, f — natural highways for the rooks and queen. Half-open for White: a.
The White king has 4 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
36. Rf1+ Ke4 37. Rf4+ Kd5 38. Rd6#
Why it works
- Great move! rook to f1 keeps the pressure (#2).
- Well found: rook to f4 (#1).
- Precise: rook to d6 is the top choice (#).
- The line ends in a forced mate in 3.
- If instead Ke4, then Rf4+ and you stay on top.
Move by move
- 36. Rf1+ — rook to f1 with check
- Ke4 — king to e4
- 37. Rf4+ — rook to f4 with check
- Kd5 — king to d5
- 38. Rd6# — rook to d6 and it is checkmate
Types in this puzzle
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.
About this position
These pieces come from starting position #464.
SP-464 · BastionGuard — A c- or f-file king and two knights on inner files (b–g).
The king starts on f1, the rooks on c1 and g1, the queen on h1.
Castling short simply swaps the two pieces: the king on f1 and the rook on g1 trade places.
A bishop starts in the corner on a1: it has a single diagonal, which the b-pawn unlocks, running out to h8.
One second-rank pawn starts with no defender at all: d2.
The setup belongs to the BastionGuard family; read right to left it becomes position 687.
The engine's main line opens with c4.
Morozov Balance Index: 55 of 100 — class B — balanced. Engine evaluation of the starting position: +25 centipawns for White (depth 43, 400 000 000 nodes).
Explore position #464Provenance
Mined from the project's engine self-play games.
Pack 014 · SP-464
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