r1bk1bnr/p2pp1p1/1qpN2n1/Pp3p1p/R1P3PP/3BPP2/1P1P4/1NBQK2R w K - 1 18
FEN state: r1bk1bnr/p2pp1p1/1qpN2n1/Pp3p1p/R1P3PP/3BPP2/1P1P4/1NBQK2R w K - 1 18 ; Best move: a5b6
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at d8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at d7, black pawn at e7 and black pawn at g7. Black queen at b6, black pawn at c6, white knight at d6 and black knight at g6. White pawn at a5, black pawn at b5, black pawn at f5 and black pawn at h5. White rook at a4, white pawn at c4, white pawn at g4 and white pawn at h4. White bishop at d3, white pawn at e3 and white pawn at f3. White pawn at b2 and white pawn at d2. White knight at b1, white bishop at c1, white queen at d1, white king at e1 and white rook at h1. White kingside is the only castle move available. Half move number is 1. Full move number is 18. White to move.