r1bqkbn1/2pp2r1/1p5p/pn2p1p1/1NB3P1/P4P1N/2PPQP1P/R1B2K1R w q - 0 16
FEN state: r1bqkbn1/2pp2r1/1p5p/pn2p1p1/1NB3P1/P4P1N/2PPQP1P/R1B2K1R w q - 0 16 ; Best move: e2e5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black knight at g8. Black pawn at c7, black pawn at d7 and black rook at g7. Black pawn at b6 and black pawn at h6. Black pawn at a5, black knight at b5, black pawn at e5 and black pawn at g5. White knight at b4, white bishop at c4 and white pawn at g4. White pawn at a3, white pawn at f3 and white knight at h3. White pawn at c2, white pawn at d2, white queen at e2, white pawn at f2 and white pawn at h2. White rook at a1, white bishop at c1, white king at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 16. White to move.