rn1qkb2/ppp1p1p1/2bp1n1r/1Q3p1p/2PP3N/P6P/1P2PPP1/RNBK1B1R b q - 4 10
FEN state: rn1qkb2/ppp1p1p1/2bp1n1r/1Q3p1p/2PP3N/P6P/1P2PPP1/RNBK1B1R b q - 4 10 ; Best move: c6b5
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black king at e8 and black bishop at f8. Black pawn at a7, black pawn at b7, black pawn at c7, black pawn at e7 and black pawn at g7. Black bishop at c6, black pawn at d6, black knight at f6 and black rook at h6. White queen at b5, black pawn at f5 and black pawn at h5. White pawn at c4, white pawn at d4 and white knight at h4. White pawn at a3 and white pawn at h3. White pawn at b2, white pawn at e2, white pawn at f2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1, white king at d1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 4. Full move number is 10. Black to move.