r2qkbr1/pb1p3p/1pn1p2n/5pp1/4P1P1/5P1N/PPPPQ1KP/RNB4R b q - 1 10
FEN state: r2qkbr1/pb1p3p/1pn1p2n/5pp1/4P1P1/5P1N/PPPPQ1KP/RNB4R b q - 1 10 ; Best move: c6d4
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black bishop at b7, black pawn at d7 and black pawn at h7. Black pawn at b6, black knight at c6, black pawn at e6 and black knight at h6. Black pawn at f5 and black pawn at g5. White pawn at e4 and white pawn at g4. White pawn at f3 and white knight at h3. White pawn at a2, white pawn at b2, white pawn at c2, white pawn at d2, white queen at e2, white king at g2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 10. Black to move.