Thanks for the book tip. Most openings theory these days is digital but I am old school. My local Chess shop never took it in but I found it a Amazon arrived som days ago looks very interesting.

The line goes 1.e4 c5 2.Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Nc6 6 f3 h5!?

The idea is to met Qd2 with Nxd4 Bxd4 Bh6 eg Be3 Bxe3 Qxe3 Be6.

I dont know if I would play it in Corrspondence Chess but in my experince it works well in over the board Chess and I think it is a practical line for club players.

I first learned about the line from the Chessable base "Wing attack" and I played as over the board main weapon ever since. Now ModernChess realised a base about it as well the line calling in "the Dubov Dragon".