1r3knr/p4p2/np1pp1p1/1qP4p/P2pP3/RP1QB1bN/4KP1P/1N3BR1 w - - 0 18
FEN state: 1r3knr/p4p2/np1pp1p1/1qP4p/P2pP3/RP1QB1bN/4KP1P/1N3BR1 w - - 0 18 ; Best move: a4b5
The current state of the chess board is: Black rook at b8, black king at f8, black knight at g8 and black rook at h8. Black pawn at a7 and black pawn at f7. Black knight at a6, black pawn at b6, black pawn at d6, black pawn at e6 and black pawn at g6. Black queen at b5, white pawn at c5 and black pawn at h5. White pawn at a4, black pawn at d4 and white pawn at e4. White rook at a3, white pawn at b3, white queen at d3, white bishop at e3, black bishop at g3 and white knight at h3. White king at e2, white pawn at f2 and white pawn at h2. White knight at b1, 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.