r1b1kb1r/4q3/pn1pn3/2p1p1pp/1BP2p2/1P1PPN1P/P1R1NPP1/Q2K1B1R w kq - 2 20
FEN state: r1b1kb1r/4q3/pn1pn3/2p1p1pp/1BP2p2/1P1PPN1P/P1R1NPP1/Q2K1B1R w kq - 2 20 ; Best move: b4a5
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black queen at e7. Black pawn at a6, black knight at b6, black pawn at d6 and black knight at e6. Black pawn at c5, black pawn at e5, black pawn at g5 and black pawn at h5. White bishop at b4, white pawn at c4 and black pawn at f4. White pawn at b3, white pawn at d3, white pawn at e3, white knight at f3 and white pawn at h3. White pawn at a2, white rook at c2, white knight at e2, white pawn at f2 and white pawn at g2. White queen at a1, white king at d1, white bishop at f1 and white rook at h1. Black kingside and black queenside castles are available. Half move number is 2. Full move number is 20. White to move.