r1k2br1/4ppp1/1pp2n1p/1pPn4/P2P4/1q2P2P/1BR1KP2/2Q1NBR1 b - - 0 21
FEN state: r1k2br1/4ppp1/1pp2n1p/1pPn4/P2P4/1q2P2P/1BR1KP2/2Q1NBR1 b - - 0 21 ; Best move: a8a4
The current state of the chess board is: Black rook at a8, black king at c8, black bishop at f8 and black rook at g8. Black pawn at e7, black pawn at f7 and black pawn at g7. Black pawn at b6, black pawn at c6, black knight at f6 and black pawn at h6. Black pawn at b5, white pawn at c5 and black knight at d5. White pawn at a4 and white pawn at d4. Black queen at b3, white pawn at e3 and white pawn at h3. White bishop at b2, white rook at c2, white king at e2 and white pawn at f2. White queen at c1, white knight at e1, white bishop at f1 and white rook at g1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.