I don't know at what rating a few moderately superior pieces starts to = tangible winning chances, maybe around 2000? In any case I'm fairly new to seeing it in my own games / from my opponents.
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It's not a specific rating, but a skill level. In the 1950s (and perhaps even before), players began to realize that even a single badly placed piece in the opening was enough to have an inferior game. There are certain positions where even a beginner could see the long-term advantage of having a superior piece, such as Bishop endings with pawns all on the same colored squares as that B (the classic bad bishop).
Most opening books give evaluations based on the relative placement of the pieces. So in a very real sense, the level at which piece placement matters in the evaluation of an opening is about the level at which opening books begin to become useful.
It's no coincidence that Rumo, Pfren, ponz, and myself all agree that White has several paths to a comfortable edge in the Budapest, but the Budapest does not quite lead to a lost position. There are many interesting and nefarious traps in the Budapest, but White has well known paths that avoid some of the worst of these.
Of course, even top GMs, such as Gelfand, occasionally get mixed up, miss a key move, and get into trouble. But is that really a reason to take up the opening as a repertoire choice? There are many good repertoire choices for Black against 1.d4 without giving White such a large advantage in the opening. The Budapest may be a useful occasional weapon especially in fast time controls, but not as a main weapon.
@ bb_gum
Thank you for your idea to explain the position but its not always so simple, especially on OTB conditions to understand how and why.
@ LuftWaffles
If i was feeling empowered from my engine, i will probably have write that the position is fairly equal but i didn't. You can go back and you will see that i am asking everyone here, not only the titled players: I write to Dolphin- White has the bishop pair, is that enough? White has a slight initiative on the Queen side is that enough? and no one answers!
And if Victor Korchnoi didn't find a way to win in this position then how am i supposed to do? or my 1800 opponent?