r1bk1b1r/pp5p/n2p4/2pnppp1/2q1P3/1P1P1QPN/P2K3P/RNBB3R b - - 0 21
FEN state: r1bk1b1r/pp5p/n2p4/2pnppp1/2q1P3/1P1P1QPN/P2K3P/RNBB3R b - - 0 21 ; Best move: c4b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at d8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at b7 and black pawn at h7. Black knight at a6 and black pawn at d6. Black pawn at c5, black knight at d5, black pawn at e5, black pawn at f5 and black pawn at g5. Black queen at c4 and white pawn at e4. White pawn at b3, white pawn at d3, white queen at f3, white pawn at g3 and white knight at h3. White pawn at a2, white king at d2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white bishop at d1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.