2b1kbr1/1p2p2p/rq1p2p1/p1p1n3/PPP5/1NB1P1P1/R4P1P/3K1BNR b - - 0 21
FEN state: 2b1kbr1/1p2p2p/rq1p2p1/p1p1n3/PPP5/1NB1P1P1/R4P1P/3K1BNR b - - 0 21 ; Best move: a5b4
The current state of the chess board is: Black bishop at c8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at b7, black pawn at e7 and black pawn at h7. Black rook at a6, black queen at b6, black pawn at d6 and black pawn at g6. Black pawn at a5, black pawn at c5 and black knight at e5. White pawn at a4, white pawn at b4 and white pawn at c4. White knight at b3, white bishop at c3, white pawn at e3 and white pawn at g3. White rook at a2, white pawn at f2 and white pawn at h2. White king at d1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.