@RichieTozier said in #9:
> I think there are 3 diffrent catogieres. The ones that have not so much to do with chess (game-changing rules), i would include Antichess. Atomic chess and Racing Kings. These don't really help, because they don't have to do a lot with chess anymore. It can be argued that they help with calculation but that is only a small part.
> Then there are variants with extra rules but similar goals to normal chess: King of the Hill, Three Check, Crazy House and Horde (not to sure if this should count). Imo these can help with your std chess if you take them serious and calculate thoroughly. Especially Crazy House can really help with tactical calculation if done right.
> And then there is the last category of just diffrent starting positions what is Chess960 which is just chess with a diffrent starting position but same rules.
Good guess. There are indeed three categories: one includes Racing Kings and Three-Check. These are the worst in terms of decreasing your likelihood to win at standard chess. They lower your odds of victory by about 50% if you play them instead of standard. A second category includes King of the Hill, Atomic, Antichess, and Horde. These decrease your odds of victory by about 30%. The other category includes Crazyhouse and Chess960. Crazyhouse only decreases your odds of victory by about 15%, and Chess960 makes no difference. None of them help.
More details here:
lichess.org/@/piazzai/blog/do-variants-help-you-play-better-chess-statistical-evidence/0tAPXnqH