r1bqkb2/p1n1n1pr/1p1p3p/1Pp1R3/2P2p1P/B1NP4/P1Q1PPP1/R3KBN1 w Q - 0 16
FEN state: r1bqkb2/p1n1n1pr/1p1p3p/1Pp1R3/2P2p1P/B1NP4/P1Q1PPP1/R3KBN1 w Q - 0 16 ; Best move: e5e4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8 and black bishop at f8. Black pawn at a7, black knight at c7, black knight at e7, black pawn at g7 and black rook at h7. Black pawn at b6, black pawn at d6 and black pawn at h6. White pawn at b5, black pawn at c5 and white rook at e5. White pawn at c4, black pawn at f4 and white pawn at h4. White bishop at a3, white knight at c3 and white pawn at d3. White pawn at a2, white queen at c2, white pawn at e2, white pawn at f2 and white pawn at g2. White rook at a1, white king at e1, white bishop at f1 and white knight at g1. White queenside is the only castle move available. Half move number is 0. Full move number is 16. White to move.