rnb1kr1b/3p1p1p/2p4n/P3p1p1/1pQP1qPP/B1P5/P2NPP2/R3KBNR w q - 2 20
FEN state: rnb1kr1b/3p1p1p/2p4n/P3p1p1/1pQP1qPP/B1P5/P2NPP2/R3KBNR w q - 2 20 ; Best move: c4b4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8, black rook at f8 and black bishop at h8. Black pawn at d7, black pawn at f7 and black pawn at h7. Black pawn at c6 and black knight at h6. White pawn at a5, black pawn at e5 and black pawn at g5. Black pawn at b4, white queen at c4, white pawn at d4, black queen at f4, white pawn at g4 and white pawn at h4. White bishop at a3 and white pawn at c3. White pawn at a2, white knight at d2, white pawn at e2 and white pawn at f2. White rook at a1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 2. Full move number is 20. White to move.