r1b3nr/pkp1p2p/1p1q1p1b/P2p2P1/3P1BP1/2P4N/R1Q1PP1R/1N2KB2 w - - 4 16
FEN state: r1b3nr/pkp1p2p/1p1q1p1b/P2p2P1/3P1BP1/2P4N/R1Q1PP1R/1N2KB2 w - - 4 16 ; Best move: a5a6
The current state of the chess board is: Black rook at a8, black bishop at c8, black knight at g8 and black rook at h8. Black pawn at a7, black king at b7, black pawn at c7, black pawn at e7 and black pawn at h7. Black pawn at b6, black queen at d6, black pawn at f6 and black bishop at h6. White pawn at a5, black pawn at d5 and white pawn at g5. White pawn at d4, white bishop at f4 and white pawn at g4. White pawn at c3 and white knight at h3. White rook at a2, white queen at c2, white pawn at e2, white pawn at f2 and white rook at h2. White knight at b1, white king at e1 and white bishop at f1. Both players have exhausted their castles. Half move number is 4. Full move number is 16. White to move.