r1bq1bn1/2p2k2/p1n1p3/PNBp1p2/2PQP1pr/3P1Pp1/1P2N3/3RKB1R b K - 1 21
FEN state: r1bq1bn1/2p2k2/p1n1p3/PNBp1p2/2PQP1pr/3P1Pp1/1P2N3/3RKB1R b K - 1 21 ; Best move: c6d4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black bishop at f8 and black knight at g8. Black pawn at c7 and black king at f7. Black pawn at a6, black knight at c6 and black pawn at e6. White pawn at a5, white knight at b5, white bishop at c5, black pawn at d5 and black pawn at f5. White pawn at c4, white queen at d4, white pawn at e4, black pawn at g4 and black rook at h4. White pawn at d3, white pawn at f3 and black pawn at g3. White pawn at b2 and white knight at e2. White rook at d1, white king at e1, white bishop at f1 and white rook at h1. White kingside is the only castle move available. Half move number is 1. Full move number is 21. Black to move.