r4b1r/1pqn1k2/5np1/p1ppp3/P1PN3P/1P2PP1R/3P2P1/R1B1KBN1 w Q - 1 16
FEN state: r4b1r/1pqn1k2/5np1/p1ppp3/P1PN3P/1P2PP1R/3P2P1/R1B1KBN1 w Q - 1 16 ; Best move: d4b5
The current state of the chess board is: Black rook at a8, black bishop at f8 and black rook at h8. Black pawn at b7, black queen at c7, black knight at d7 and black king at f7. Black knight at f6 and black pawn at g6. Black pawn at a5, black pawn at c5, black pawn at d5 and black pawn at e5. White pawn at a4, white pawn at c4, white knight at d4 and white pawn at h4. White pawn at b3, white pawn at e3, white pawn at f3 and white rook at h3. White pawn at d2 and white pawn at g2. White rook at a1, white bishop at c1, 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 1. Full move number is 16. White to move.