r1b1k2r/2nq2p1/p1p1p2p/2bn1P1P/1pN1P3/BP1p3N/P1PP1PB1/1R1QKR2 w q - 1 20
FEN state: r1b1k2r/2nq2p1/p1p1p2p/2bn1P1P/1pN1P3/BP1p3N/P1PP1PB1/1R1QKR2 w q - 1 20 ; Best move: a3b2
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black rook at h8. Black knight at c7, black queen at d7 and black pawn at g7. Black pawn at a6, black pawn at c6, black pawn at e6 and black pawn at h6. Black bishop at c5, black knight at d5, white pawn at f5 and white pawn at h5. Black pawn at b4, white knight at c4 and white pawn at e4. White bishop at a3, white pawn at b3, black pawn at d3 and white knight at h3. White pawn at a2, white pawn at c2, white pawn at d2, white pawn at f2 and white bishop at g2. White rook at b1, white queen at d1, white king at e1 and white rook at f1. Black queenside is the only castle move available. Half move number is 1. Full move number is 20. White to move.