r1k3nr/1p6/1B3p2/pb1P1Ppp/1P6/P4NbP/4P1PR/RNK2B2 b - - 0 23
FEN state: r1k3nr/1p6/1B3p2/pb1P1Ppp/1P6/P4NbP/4P1PR/RNK2B2 b - - 0 23 ; Best move: a5b4
The current state of the chess board is: Black rook at a8, black king at c8, black knight at g8 and black rook at h8. Black pawn at b7. White bishop at b6 and black pawn at f6. Black pawn at a5, black bishop at b5, white pawn at d5, white pawn at f5, black pawn at g5 and black pawn at h5. White pawn at b4. White pawn at a3, white knight at f3, black bishop at g3 and white pawn at h3. White pawn at e2, white pawn at g2 and white rook at h2. White rook at a1, white knight at b1, white king at c1 and white bishop at f1. Both players have exhausted their castles. Half move number is 0. Full move number is 23. Black to move.