1rb2bn1/p1k1pB2/1p1N3r/n1p3p1/1PPq3p/P3B2P/5PP1/RN2KQR1 w Q - 2 20
FEN state: 1rb2bn1/p1k1pB2/1p1N3r/n1p3p1/1PPq3p/P3B2P/5PP1/RN2KQR1 w Q - 2 20 ; Best move: d6b5
The current state of the chess board is: Black rook at b8, black bishop at c8, black bishop at f8 and black knight at g8. Black pawn at a7, black king at c7, black pawn at e7 and white bishop at f7. Black pawn at b6, white knight at d6 and black rook at h6. Black knight at a5, black pawn at c5 and black pawn at g5. White pawn at b4, white pawn at c4, black queen at d4 and black pawn at h4. White pawn at a3, white bishop at e3 and white pawn at h3. White pawn at f2 and white pawn at g2. White rook at a1, white knight at b1, white king at e1, white queen at f1 and white rook at g1. White queenside is the only castle move available. Half move number is 2. Full move number is 20. White to move.