rn2kbnr/1bp3p1/p2q3p/Pp2p3/1P3p2/5NP1/N1QPPK1P/1RB2B1R w q - 0 18
FEN state: rn2kbnr/1bp3p1/p2q3p/Pp2p3/1P3p2/5NP1/N1QPPK1P/1RB2B1R w q - 0 18 ; Best move: g3f4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black bishop at b7, black pawn at c7 and black pawn at g7. Black pawn at a6, black queen at d6 and black pawn at h6. White pawn at a5, black pawn at b5 and black pawn at e5. White pawn at b4 and black pawn at f4. White knight at f3 and white pawn at g3. White knight at a2, white queen at c2, white pawn at d2, white pawn at e2, white king at f2 and white pawn at h2. White rook at b1, white bishop at c1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 18. White to move.