The USGA and R&A define Stableford points in this manner:
More than 1 over fixed score (or no score returned) - 0 points
One over fixed score - 1 point
Fixed score - 2 points
One under fixed score - 3 points
Two under fixed score - 4 points
Three under fixed score - 5 points
Four under fixed score - 6 points
Rules related to Stableford competitions can be found in the official rules under Rule 32.
Stableford competitions are usually played with full handicaps, but might be played at scratch with handicaps used to determine higher point rewards for higher handicappers. For example, golfers might be flighted as A, B, C and D players, with points adjusted so that a par gets an A player 0 points, a B player 1 point, a C player 2 points and a D player 3 points.
Golfers might be more familiar with the term Modified Stableford, which refers to a Stableford competition in which the points or exact format differs from the Stableford system described in the rulebook. See Modified Stableford.
For further explanation, please see: How to Play Stableford or Modified Stableford Competitions

