whats the best way to counter traxler counter attack


I agree d4 is very annoying for black.
Moreover, less known than Bxf7 and Nxf7, u can surprise your opponent easily.
Just for some background info: IM pfren knows the Traxler inside and out as he has played it numerous times both as white and black in correspondence tournaments. He has performed engine analysis to extraordinary depths and should be considered an expert in the opening.

5.d4!
what's the idea behind this move?
Something like that.
Notice that it's not only the f4 square, but in certain cases the d4 one, as well.
thanks!

Just for some background info: IM pfren knows the Traxler inside and out as he has played it numerous times both as white and black in correspondence tournaments. He has performed engine analysis to extraordinary depths and should be considered an expert in the opening.
Actually I have not played this thing more than one dozen times. All that I know about it is due to the work I have done on the games while they were ongoing.
OTB I have never played 4.Ng5 as white, and as Black I have 100% with another unsound defense: the Ulvestad.
The difference is that the Ulvestad is "almost" unsound, as Black gets a bit of play for his pawn, while the only question about the Traxler is if it loses by force, or not.
The best Black can hope of after 5.d4! is playing a pawn down for no compensation. This can be done in two different ways. While I'm not sure that white should win the resulting positions for sure, they are (both of them) so depressing to defend, that the Traxler should be discarded as unsound.
Maybe there is also a defintive refutation in 5.Bxf7+ Ke7 6.Bc4, which is much less popular that the retreat to d5 or b3. I guess I will play this the next time I meet the Traxler, as I get slightly bored playing the same stuff again, and again...
Would you mind sending me some notes or a game you played in the Ulvestad? I like it’s aggressive style and surprise value, so I frequently play it. It does leave blacks pawn structure fractured, especially with proper play (though, in 80 or so Ulvestad games I’ve played, only one player saw and played 6. Bf1). But resources on it are far and few between.

This is one of the lines that give Black slim chances to survive.
I think that white should win, but in the following game I had to be inventive to convert the pawn advantage.
During the game, I rejected 11.Be3 in favor of the slightly counterintuitive 11.Bb2, but explaining "why" will need a very long post. Suffice to say that I always take the engine's suggestions with a grain of salt, unless they are pure tactical sequences.
Heisman gave 11 Bb2 "+=" back in the year 2000. In that line I've played two, drawn two with 11...b6 12 cxb6 axb6 13 Nd2 f6, but obviously that's all Black is ever going to get.

to all of you that respond thank you very much i actually forgot i wrote this thing now i am playing london with white and most of the times najdorf as black thannks again for responding