Pogonina, is it so that if someone makes an illegal move by accident, for example in blitz, like not getting the king out of check, he/she loses?
I know I'm not Pogonina, but I'll answer it anyway, yes, that would be a case in blitz if there is "inadequate supervision":
ok thanks
"Check" has fallen out of disfavor. More modern is "gotchya," and "I don't think so, buddy" (or "Je ne crois pas, garcon!" - another generally accepted french phrase in addition to j'adoube)