5

There's no quantifiable answer to this. In my subjective experience, the most controversial openings would be the Dutch Defense and the King's Indian Defense. I have heard strong players (Sam Shankland, multiple times, including in some of his chess.com videos) heavily disparage the Dutch, but it is still defended occasionally at the top level, most ...


2

Computer variants (Lichess/Stockfish) are no answer ;-), but since it would get way too long for a comment... 1.d4 c6 (Playable, +0.3 vs e.g. +0.2 for d5, but very tame.) 2.Bf4 (Also uncommon, back to +0.1 vs. a normal developing move.) 2...Qb6 (Back to +0.3, again a normal move like Nf6 is preferrable) 3.Nf3 (+0.3, b3 is only +0.1) 3...Qxb2 (Asking for it, +...


2

The problem with Bg5 is mainly that black will usually be better prepared than white in the messy poisoned pawn. He either doesn't play it or he knows it. On the other hand imagine Be3. There black is quite predictable as not following the main lines is too dangerous. White has a lot of good systems to try so he has much easier life. Objective quality is not ...


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