1nb3nr/rppp3p/p2k1p1b/q3p3/1P3PPp/N3B3/P1PPP2R/R1Q1KBN1 w Q - 2 18
FEN state: 1nb3nr/rppp3p/p2k1p1b/q3p3/1P3PPp/N3B3/P1PPP2R/R1Q1KBN1 w Q - 2 18 ; Best move: b4a5
The current state of the chess board is: Black knight at b8, black bishop at c8, black knight at g8 and black rook at h8. Black rook at a7, black pawn at b7, black pawn at c7, black pawn at d7 and black pawn at h7. Black pawn at a6, black king at d6, black pawn at f6 and black bishop at h6. Black queen at a5 and black pawn at e5. White pawn at b4, white pawn at f4, white pawn at g4 and black pawn at h4. White knight at a3 and white bishop at e3. White pawn at a2, white pawn at c2, white pawn at d2, white pawn at e2 and white rook at h2. White rook at a1, white queen at c1, white king at e1, white bishop at f1 and white knight at g1. White queenside is the only castle move available. Half move number is 2. Full move number is 18. White to move.