What do you think is the most complex opening or variation there is?

What do you think is the most complex opening or variation there is?

the caro kann

either sicilian or semi-slav

'In 1990, the authors of Modern Chess Openings (13th edition) noted that "in the twentieth century the Sicilian has become the most played and most analysed opening at both the club and master levels."'

https://en.wikipedia.org/wiki/Sicilian_Defence

It still is.

I'll guess the Sicilian Najdorf.

I noticed a couple times when Agadmator has analyzed games, after a specific move in the opening, he commented that 10 or more options for the next move played has been recorded in earlier games.

isn't the Greenfeld
https://lichess.org/opening/Grunfeld_Defense
pretty intricate with two pawns standing en prise or with those behind?

i lately had a look at it and didn't really understand the lines, neither the moves, nor their outcome ... everything seems like the board were full of raw eggs breaking on slightest impact i swear lol

@lichess
{
i suggest an admin move this to 'general chess discussions' forum for even better and-or more experts' answers
}

@salmon_rushdie
why caro kann?
in the closed, there's mainly only c5 with common kinds of positions;
in the open, there's also no outstandingly different positions ( from general open openings ), isn't it,
what am I missing?

@DuMussDieUhrDruecken said in #8:

@salmon_rushdie
why caro kann?
in the closed, there's mainly only c5 with common kinds of positions;
in the open, there's also no outstandingly different positions ( from general open openings ), isn't it,
what am I missing?

I think he was being sarcastic

Sicilian Najdorf
Sicilian Dragon
Sicilian Sveshnikov
Grünfeld
King's Indian Defense
Marshall Attack
Open Ruy Lopez