r3k2r/5p1p/6p1/qppppbb1/pP2N1P1/B7/PnPPBK1P/RQ4NR w q - 0 20
FEN state: r3k2r/5p1p/6p1/qppppbb1/pP2N1P1/B7/PnPPBK1P/RQ4NR w q - 0 20 ; Best move: b4a5
The current state of the chess board is: Black rook at a8, black king at e8 and black rook at h8. Black pawn at f7 and black pawn at h7. Black pawn at g6. Black queen at a5, black pawn at b5, black pawn at c5, black pawn at d5, black pawn at e5, black bishop at f5 and black bishop at g5. Black pawn at a4, white pawn at b4, white knight at e4 and white pawn at g4. White bishop at a3. White pawn at a2, black knight at b2, white pawn at c2, white pawn at d2, white bishop at e2, white king at f2 and white pawn at h2. White rook at a1, white queen at b1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 20. White to move.