1nb2k1r/r1ppb1pp/p4p2/PB4NP/RP2pqn1/2N1PP2/2PPK1P1/2B2Q2 b - - 2 20
FEN state: 1nb2k1r/r1ppb1pp/p4p2/PB4NP/RP2pqn1/2N1PP2/2PPK1P1/2B2Q2 b - - 2 20 ; Best move: f4g5
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at f8 and black rook at h8. Black rook at a7, black pawn at c7, black pawn at d7, black bishop at e7, black pawn at g7 and black pawn at h7. Black pawn at a6 and black pawn at f6. White pawn at a5, white bishop at b5, white knight at g5 and white pawn at h5. White rook at a4, white pawn at b4, black pawn at e4, black queen at f4 and black knight at g4. White knight at c3, white pawn at e3 and white pawn at f3. White pawn at c2, white pawn at d2, white king at e2 and white pawn at g2. White bishop at c1 and white queen at f1. Both players have exhausted their castles. Half move number is 2. Full move number is 20. Black to move.