Sicilian Concepts

It is curious how our understanding of chess changes. I've written more than once that we have to thank the engines for that and here I'd like to share with you one of the latest revelations.

In the past (but not that long ago, let's say 1980s and 1990s) the move a3 in the Sicilian was more often than not considered a waste of time, or admission by Whit…