Judo is a striking skill

[malloyd]

Originally Posted by MrFix

Please find us the skill that defaults to DX to punch and DX-2 to kick.

It's Brawling. Except that DX rolls for unarmed combat predate the rules for defaults (and quite possibly for any unarmed combat skills at all).
Since Brawling covers stuff not actually available at DX defaults - particularly that damage bonus - which is actually true of *all* defaults, but so many people refuse to understand that, I suppose it was felt that explicitly wording it as a default would hurt more than it would help, especially in these post Martial Arts 1e days when Brawling picked up more stuff that would need to be exempted from the default and people would argue about when it was.

That historical issue also hits this Judo = DX issue too, remember when that rule was written Judo was the only grappling skill in GURPS, and grappling has those DX defaults too - this substitution is actually a version of the same thing, saying you can use Judo anywhere the grappling rules that call for DX. Later written rules will usually call for "DX or grappling skill" in places the oldest rules would call for DX and slightly later rules might possibly have used "DX or Judo" but mostly didn't, depending on this substitution written into the Judo skill.