Lolli attack?

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GrandCheesemaster

I was looking for a new opening to play as white and came across the Fried Liver Attack, analysed it and found that me playing white in the FLA lost to me playing black in the FLA. However I read that Fischer strongly promoted the Lolli attack, and found that it was 6.d4. I looked this up and found a lot of people saying that if the game was played as shown below then white practically had a forced win.

I really can't see how this is true, and am hoping that someone here will be able to help me out.

That board shows up to 6.d4

Thanks in advance.

Kacparov

it is better for white I think but I don't know how, I don't play it