1nbq1kr1/r7/1pp2pp1/p1bp1np1/3PPPP1/PPP4P/3B2R1/RN2KB2 w Q - 1 20
FEN state: 1nbq1kr1/r7/1pp2pp1/p1bp1np1/3PPPP1/PPP4P/3B2R1/RN2KB2 w Q - 1 20 ; Best move: g4f5
The current state of the chess board is: Black knight at b8, black bishop at c8, black queen at d8, black king at f8 and black rook at g8. Black rook at a7. Black pawn at b6, black pawn at c6, black pawn at f6 and black pawn at g6. Black pawn at a5, black bishop at c5, black pawn at d5, black knight at f5 and black pawn at g5. White pawn at d4, white pawn at e4, white pawn at f4 and white pawn at g4. White pawn at a3, white pawn at b3, white pawn at c3 and white pawn at h3. White bishop at d2 and white rook at g2. White rook at a1, white knight at b1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 1. Full move number is 20. White to move.