r1bqkbr1/3p2p1/2Q2p2/pp2p3/8/NP1PPP2/PBPK2nP/R4B1R b q - 0 21
FEN state: r1bqkbr1/3p2p1/2Q2p2/pp2p3/8/NP1PPP2/PBPK2nP/R4B1R b q - 0 21 ; Best move: d7c6
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at d7 and black pawn at g7. White queen at c6 and black pawn at f6. Black pawn at a5, black pawn at b5 and black pawn at e5. White knight at a3, white pawn at b3, white pawn at d3, white pawn at e3 and white pawn at f3. White pawn at a2, white bishop at b2, white pawn at c2, white king at d2, black knight at g2 and white pawn at h2. White rook at a1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 21. Black to move.