rnbq1rk1/3ppp1p/p1p2b1n/1P6/1P1BP1P1/NQ1B3N/P2P1PP1/R3K1R1 w Q - 10 16
FEN state: rnbq1rk1/3ppp1p/p1p2b1n/1P6/1P1BP1P1/NQ1B3N/P2P1PP1/R3K1R1 w Q - 10 16 ; Best move: e4e5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black queen at d8, black rook at f8 and black king at g8. Black pawn at d7, black pawn at e7, black pawn at f7 and black pawn at h7. Black pawn at a6, black pawn at c6, black bishop at f6 and black knight at h6. White pawn at b5. White pawn at b4, white bishop at d4, white pawn at e4 and white pawn at g4. White knight at a3, white queen at b3, white bishop at d3 and white knight at h3. White pawn at a2, white pawn at d2, white pawn at f2 and white pawn at g2. White rook at a1, white king at e1 and white rook at g1. White queenside is the only castle move available. Half move number is 10. Full move number is 16. White to move.