After 7 Bc4?! White's centre collapses, which seems too high a price to pay for the temporary inconvenience to Black's king. Later Velimirovic switched to 7 dxc5, while Kramnik's choice against Grischuk was 7 exd6, though he didn't get an advantage either. After 7 Bc4?! 0-0 is playable, but it's not really necessary to allow Velimirovic's attack against Rajkovic. Instead I give in my book 7...cxd4 8 Bxf7+?! Kxf7 9 e6+ Kf8! 10 exd7 dxc3 11 dxc8 Qxc8 and Black emerges a pawn up. I should perhaps have added that after the better 8 Qxd4 0-0 9 Qe4 Nc6 Black is doing well (e.g. Ljubojevic-Jansa: Informator 14. This hasn't been much examined in the computer age, but I doubt whether it can be rescued for White.
Hope this helps!

I played a game the other night that went:

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 c5 6. e5 Nfd7 7. Bc4. I was on my own at this point, so I went in for: 7. ...0-0 8. e6 Nb6 9. exf7+ Kh8, which I thought was OK. The game continued: 10. Be2 cxd4 11. Nxd4 Nc6 12. Be3 e5 13. Nxc6 bxc6 14. fxe5 Bxe5 15. Bd4?! Qh4+ 16. Bf2 Qh6 17. Qd2 Qxd2+ 18. Kxd2 Rxf7, and black is doing well. When I looked on www.chesslive.de later, I found the game Velimirovic-Rajkovic, 1971. In that game, white goes 10. h4, and black is quickly routed. In other games in the db, it looks like black often chooses 7. ...cxd4, when white has played either 8. Bxf7+ Kxf7 9. e6+, or 8. Qxd4. So I guess my question is, does anyone know what the established recipe(s) are in this 7. Bc4 line? Is 7. ...0-0 playable, or is it busted by Velimirovic's 10. h4?

Thanks,

Kevin