rn3r2/2pp2kp/1pb2p1b/pNP2Pp1/P3PQn1/8/1P1PB1P1/1RB2KNR b - - 2 21
FEN state: rn3r2/2pp2kp/1pb2p1b/pNP2Pp1/P3PQn1/8/1P1PB1P1/1RB2KNR b - - 2 21 ; Best move: g5f4
The current state of the chess board is: Black rook at a8, black knight at b8 and black rook at f8. Black pawn at c7, black pawn at d7, black king at g7 and black pawn at h7. Black pawn at b6, black bishop at c6, black pawn at f6 and black bishop at h6. Black pawn at a5, white knight at b5, white pawn at c5, white pawn at f5 and black pawn at g5. White pawn at a4, white pawn at e4, white queen at f4 and black knight at g4. White pawn at b2, white pawn at d2, white bishop at e2 and white pawn at g2. White rook at b1, white bishop at c1, white king at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 2. Full move number is 21. Black to move.