1rb1q2r/1pp1nk2/2np1ppb/pB3P1p/P2Pp1PP/4P2N/1PP2K2/RNBQ2R1 w - - 4 18
FEN state: 1rb1q2r/1pp1nk2/2np1ppb/pB3P1p/P2Pp1PP/4P2N/1PP2K2/RNBQ2R1 w - - 4 18 ; Best move: g4g5
The current state of the chess board is: Black rook at b8, black bishop at c8, black queen at e8 and black rook at h8. Black pawn at b7, black pawn at c7, black knight at e7 and black king at f7. Black knight at c6, black pawn at d6, black pawn at f6, black pawn at g6 and black bishop at h6. Black pawn at a5, white bishop at b5, white pawn at f5 and black pawn at h5. White pawn at a4, white pawn at d4, black pawn at e4, white pawn at g4 and white pawn at h4. White pawn at e3 and white knight at h3. White pawn at b2, white pawn at c2 and white king at f2. White rook at a1, white knight at b1, white bishop at c1, white queen at d1 and white rook at g1. Both players have exhausted their castles. Half move number is 4. Full move number is 18. White to move.