rnb1k2r/3pppb1/1p3n2/2q3pp/3N3P/P1PBP1P1/R2P1P2/1NB2RK1 w kq - 2 18
FEN state: rnb1k2r/3pppb1/1p3n2/2q3pp/3N3P/P1PBP1P1/R2P1P2/1NB2RK1 w kq - 2 18 ; Best move: a3a4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at d7, black pawn at e7, black pawn at f7 and black bishop at g7. Black pawn at b6 and black knight at f6. Black queen at c5, black pawn at g5 and black pawn at h5. White knight at d4 and white pawn at h4. White pawn at a3, white pawn at c3, white bishop at d3, white pawn at e3 and white pawn at g3. White rook at a2, white pawn at d2 and white pawn at f2. White knight at b1, white bishop at c1, white rook at f1 and white king at g1. Black kingside and black queenside castles are available. Half move number is 2. Full move number is 18. White to move.