r1bq2n1/2pp1kr1/1B5p/p3npb1/PPp3pP/K3P1PB/2P2P1R/1RQ3N1 b - - 3 21
FEN state: r1bq2n1/2pp1kr1/1B5p/p3npb1/PPp3pP/K3P1PB/2P2P1R/1RQ3N1 b - - 3 21 ; Best move: a5b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8 and black knight at g8. Black pawn at c7, black pawn at d7, black king at f7 and black rook at g7. White bishop at b6 and black pawn at h6. Black pawn at a5, black knight at e5, black pawn at f5 and black bishop at g5. White pawn at a4, white pawn at b4, black pawn at c4, black pawn at g4 and white pawn at h4. White king at a3, white pawn at e3, white pawn at g3 and white bishop at h3. White pawn at c2, white pawn at f2 and white rook at h2. White rook at b1, white queen at c1 and white knight at g1. Both players have exhausted their castles. Half move number is 3. Full move number is 21. Black to move.