r4k1r/pbp1npp1/Rpnq3p/2P5/1P1pPpP1/1PNP4/4BQ1P/2B1K1NR w K - 4 18
FEN state: r4k1r/pbp1npp1/Rpnq3p/2P5/1P1pPpP1/1PNP4/4BQ1P/2B1K1NR w K - 4 18 ; Best move: c5d6
The current state of the chess board is: Black rook at a8, black king at f8 and black rook at h8. Black pawn at a7, black bishop at b7, black pawn at c7, black knight at e7, black pawn at f7 and black pawn at g7. White rook at a6, black pawn at b6, black knight at c6, black queen at d6 and black pawn at h6. White pawn at c5. White pawn at b4, black pawn at d4, white pawn at e4, black pawn at f4 and white pawn at g4. White pawn at b3, white knight at c3 and white pawn at d3. White bishop at e2, white queen at f2 and white pawn at h2. White bishop at c1, white king at e1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 4. Full move number is 18. White to move.