rn1rkbn1/2p1q3/bp1p2p1/p3p2p/P3p1QP/BP1P2P1/N1P2P2/R2K1BNR w q - 6 18
FEN state: rn1rkbn1/2p1q3/bp1p2p1/p3p2p/P3p1QP/BP1P2P1/N1P2P2/R2K1BNR w q - 6 18 ; Best move: g4e4
The current state of the chess board is: Black rook at a8, black knight at b8, black rook at d8, black king at e8, black bishop at f8 and black knight at g8. Black pawn at c7 and black queen at e7. Black bishop at a6, black pawn at b6, black pawn at d6 and black pawn at g6. Black pawn at a5, black pawn at e5 and black pawn at h5. White pawn at a4, black pawn at e4, white queen at g4 and white pawn at h4. White bishop at a3, white pawn at b3, white pawn at d3 and white pawn at g3. White knight at a2, white pawn at c2 and white pawn at f2. White rook at a1, white king at d1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 6. Full move number is 18. White to move.