r4k2/2p3r1/p1nbbn1p/Pp1pp1p1/2BPPPPP/RP2N3/6R1/1NBQK3 b - - 0 20
FEN state: r4k2/2p3r1/p1nbbn1p/Pp1pp1p1/2BPPPPP/RP2N3/6R1/1NBQK3 b - - 0 20 ; Best move: g5f4
The current state of the chess board is: Black rook at a8 and black king at f8. Black pawn at c7 and black rook at g7. Black pawn at a6, black knight at c6, black bishop at d6, black bishop at e6, black knight at f6 and black pawn at h6. White pawn at a5, black pawn at b5, black pawn at d5, black pawn at e5 and black pawn at g5. White bishop at c4, white pawn at d4, white pawn at e4, white pawn at f4, white pawn at g4 and white pawn at h4. White rook at a3, white pawn at b3 and white knight at e3. White rook at g2. White knight at b1, white bishop at c1, white queen at d1 and white king at e1. Both players have exhausted their castles. Half move number is 0. Full move number is 20. Black to move.