rnb1kb1r/2pp1q2/4p1p1/pp5p/1PPPNpP1/P1Q1P3/5P1P/R1BK2NR w q - 2 18
FEN state: rnb1kb1r/2pp1q2/4p1p1/pp5p/1PPPNpP1/P1Q1P3/5P1P/R1BK2NR w q - 2 18 ; Best move: c4b5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at c7, black pawn at d7 and black queen at f7. Black pawn at e6 and black pawn at g6. Black pawn at a5, black pawn at b5 and black pawn at h5. White pawn at b4, white pawn at c4, white pawn at d4, white knight at e4, black pawn at f4 and white pawn at g4. White pawn at a3, white queen at c3 and white pawn at e3. White pawn at f2 and white pawn at h2. White rook at a1, white bishop at c1, white king at d1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 2. Full move number is 18. White to move.