Sadras
Legend
Because they're among the more complex of the rules for chess, and hence when you're teaching children you build up the complexity. (That seems very obvious, and so maybe not what you were asking for? Sorry if I've missed your point.)
I've also played with adults who described themsevels as knowing how to play chess, but weren't familiar with those rules, because their grasp of the game never really got beyond that childhood level.
There is the basic rule set of D&D and there is the full fledged PHB as well as supplements. Which ever ruleset ones uses one usually never says one is playing a variant version of D&D. So too in chess, having or not having knowledge of the advanced moves does not negate that one is playing chess or classify it as a variant. A variant chess game, like Doubles or Take is far different than a kid or senior not knowing en passant and castling.
My contention is that @Maxperson's comment of
does not relegate the kid's or senior's game to a chess variant because they did know those moves. They still adhered to all the chess rules exactly therefore your comparison is not a fair comment.(snip) you must adhere to all of the rules exactly. If you don't, you are not playing chess, but are instead playing a chess variant.
There is a level of similarity between not knowing the advanced moves and not seeing your opponent setting you up for a fall - in both instances you are still adhering to all the rules. You not playing the advanced move or not countering your opponent does not make it a chess variant.
EDIT: To be clear, I'm not saying you think kids' games are chess variants, but your example was not a fair counter to [MENTION=23751]Maxperson[/MENTION]'s claim.
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