Actually I think I did once introduce a new move, although I lost the game!

1 e4 c5 2 Nf3 e6 3 d4 cxd4 4 Nxd4 Nc6 5 Nc3 Qc7 6 g3 a6 7 Bg2 Nf6 8 0-0 h5N.

Now, the idea is that White would like to play Rfe1 and e4-e5, but has a flexible position. If Black plays ...Nxd4, ...Bc5 now, White has a number of options and has exchanged one of the pieces controlling e5. This is the main line, but in the 1990's Black tried 8...Be7 and 8...h6 trying to lose a move so that after 9 Re1 Nxd4 10 Qxd4 Bc5 the f2 pawn is a trifle wobbly. Unfortunately, 10 e5! is a problem.

8...h5 was intend to allow 9 Re1 Nxd4 10 e5 Ng4, when White is in a bit of trouble. Usually White will try 9 Bg5 Ng4 10 h3 or 9 h3 h4 10 g4, with probably a slight plus, but Black can still try to get an attack going.