Mark,
Section 9 of the USGA handicap manual will tell you how. Look at the allocation for foursomes, either stroke or match play.
Bill,
We play the same 9 point game, although we don't bother to give points when all three tie a hole. If every hole went 4-4-1 you could lose $1.50 per hole (playing terribly) for a total of $27.00, not $18.00.
We sometimes make it six points per hole at $.50 per point and the scores could be 3-3-0, 4-2-0, 4-1-1, or 0-0-0 if all tie. Same max. potential loss as the 9 pt. game($1.50/hole) at $.25 per point