r1b3kr/p1ppn3/n2b2pp/1p3p2/P1KPpPPq/1PP1P2N/R6P/1NBQ1BR1 w - - 0 18
FEN state: r1b3kr/p1ppn3/n2b2pp/1p3p2/P1KPpPPq/1PP1P2N/R6P/1NBQ1BR1 w - - 0 18 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at g8 and black rook at h8. Black pawn at a7, black pawn at c7, black pawn at d7 and black knight at e7. Black knight at a6, black bishop at d6, black pawn at g6 and black pawn at h6. Black pawn at b5 and black pawn at f5. White pawn at a4, white king at c4, white pawn at d4, black pawn at e4, white pawn at f4, white pawn at g4 and black queen at h4. White pawn at b3, white pawn at c3, white pawn at e3 and white knight at h3. White rook at a2 and white pawn at h2. White knight at b1, white bishop at c1, white queen at d1, white bishop at f1 and white rook at g1. Both players have exhausted their castles. Half move number is 0. Full move number is 18. White to move.