Thankfully, new versions of xboard explain this in the blurb on the lower left of the variants window.
Type: Posts; User: Darklord42; Keyword(s):
Thankfully, new versions of xboard explain this in the blurb on the lower left of the variants window.
I know it's been a while since this was posted, but in case anyone else sees this.
The reason most of the variants are greyed out is because you can only play the variants that the loaded engine...