1r1q1k1r/4n1b1/p4ppp/1p1p2R1/RpP5/3PPPP1/3B2b1/1N1QKBN1 b - - 3 21
FEN state: 1r1q1k1r/4n1b1/p4ppp/1p1p2R1/RpP5/3PPPP1/3B2b1/1N1QKBN1 b - - 3 21 ; Best move: b5a4
The current state of the chess board is: Black rook at b8, black queen at d8, black king at f8 and black rook at h8. Black knight at e7 and black bishop at g7. Black pawn at a6, black pawn at f6, black pawn at g6 and black pawn at h6. Black pawn at b5, black pawn at d5 and white rook at g5. White rook at a4, black pawn at b4 and white pawn at c4. White pawn at d3, white pawn at e3, white pawn at f3 and white pawn at g3. White bishop at d2 and black bishop at g2. White knight at b1, white queen at d1, white king at e1, white bishop at f1 and white knight at g1. Both players have exhausted their castles. Half move number is 3. Full move number is 21. Black to move.