[j23185]

I played in a tournament yesterday and won 0.3 BBO points. An email from Live For Clubs showed 0.6 MPs for the same tournament. Is there a fixed correlation between the two scores? Or why are they different?

[mycroft]

They are different. Totally independent, in fact. Originally, BBO emulated their points award on ACBL values for club games (0.1 MP per pair in the field you're scoring in). But that doesn't mean they match, for a number of reasons:

• There are lots of BBO-rated games that aren't ACBL-sanctioned (the USA is not the world, despite many assumptions on these forums and elsewhere). Other NBOs like the English Bridge Union run BBO- (and EBU-) rated games). And BBO runs tournaments that are not sanctioned by any NBO. Therefore, you get BBO points and no ACBL points.
  
• BBO points don't take into account any of the special games allowed to ACBL clubs; a Club championship, NAP qualifying game, Junior fund game,... They are rated higher for ACBL Masterpoints.
  
• ACBL's masterpoint formula has changed since the emulation. The Masterpoint Formula is Convoluted for many many reasons (think of how any regulation is accreted to, but not removed from, over 30 years of committees and decisions and determinations. Now add politics. Now add "what we want to encourage". Now add...) There is likely exactly one person who understands all of it at any one time (and even he probably doesn't understand the club game, because (one of) his job(s) is to maintain the MP calculator for tournaments).

I'm sure I'm missing more reasons.

My bet (but I have no reason to know) is you were in a VACB (virtual ACBL club) game, and it was a special. If you follow that email from Live4Clubs and show the club page, It may say something (for instance, this game is an "online international fund" game, and paid 2.4 ACBL Black points for a 12-pair game, the same doubling you're looking at).