rnbqkb2/2pppn2/p1r5/1p1P1p1N/PB3Pp1/4P2P/1PPK4/RQ3rNR b q - 1 21
FEN state: rnbqkb2/2pppn2/p1r5/1p1P1p1N/PB3Pp1/4P2P/1PPK4/RQ3rNR b q - 1 21 ; Best move: f1b1
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black queen at d8, black king at e8 and black bishop at f8. Black pawn at c7, black pawn at d7, black pawn at e7 and black knight at f7. Black pawn at a6 and black rook at c6. Black pawn at b5, white pawn at d5, black pawn at f5 and white knight at h5. White pawn at a4, white bishop at b4, white pawn at f4 and black pawn at g4. White pawn at e3 and white pawn at h3. White pawn at b2, white pawn at c2 and white king at d2. White rook at a1, white queen at b1, black rook at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 21. Black to move.