| Glossary of Terms | ||
| T-Score | any score posted to the GHIN system as a "Tournament" type (vs. "Home" or "Away") | |
| Eligible T-Score (ETS) | any T-Score recorded in the last 12 months or within the player's last 20 score history, whichever is longer | |
| ETS Counter | The number of ETSs are counted on a rolling 12-month basis. Counters are kept per month in which the score was "processed". The T-Score Counter is the sum of the 12 monthly counters plus any T-Scores older than 12 months if they are within the player's last 20 scores. | |
| Best ETS File | The lowest 6 scores (or less if the players hasn't recorded 6 ETSs). "Differentials" are what is recorded here. | |
| Differential | A differential is the calculation of (Ajusted Gross Score - Course Rating) * (113 / Course Slope). | |
| T-Score Reduction Procedure | ||
| Step 1 | Add the differentials from the Best ETS File (rounded to .1). | |
| Step 2 | Subtract the second lowest differential in the Best ETS File from the player's Current Handicap Index [CI - 2nd best ETS]. If the result is less than 3.0 then STOP. No reduction is applied. | |
| Step 3 | Average the two lowest differentials from the Best ETS File [(lowest - 2nd lowest) / 2]. | |
| Step 4 | Subtract the result from Step 3 from the player's Currect Handicap Index [CI - step 3]. | |
| Step 5 | Use the result from Step 4, the ETS Counter, and the Handicap Index Reduction Table to arrive at a reduction amount. | |
| Step 6 | Subtract the result from step 5 from the player's Current Handicap Index to arrive at the new Current Handicap Index [CI - Step 5]. | |
| Best ETF File - Maintenance | ||
| Adding a Score | When a new ETS is recorded, if the number of ETSs on file is less than 6, then add this ETS to the file. If the number of ETs on file equals 6, then if the new ETS is less than the highest ETS on file, then replace the highest ETS on file with this ETS. | |
| Removing a Score | During GHIN handicap revision processing (monthly), if a Best ETS is older than 1 year, and it's not one of the last 20 scores, then remove it from the file. For each ETS in the player's last 20 scores, peform the Best ETF File "Adding a Score"check from above. | |
| Handicap Index Reduction Table | ||||||||
|
Step 4 \ ETS Counter --> | v |
2 | 3 | 4 | 5-9 | 10-19 | 20-29 | 30-39 | 40+ |
| 3.0 to 3.4 | * | * | * | * | * | * | * | * |
| 3.5 to 3.9 | * | * | * | * | * | * | * | * |
| 4.0 to 4.4 | 1 | * | * | * | * | * | * | * |
| 4.5 to 4.9 | 1.8 | 1 | * | * | * | * | * | * |
| 5.0 to 5.4 | 2.6 | 1.9 | 1 | * | * | * | * | * |
| 5.5 to 5.9 | 3.4 | 2.7 | 1.9 | 1 | * | * | * | * |
| 6.0 to 6.4 | 4.1 | 3.5 | 2.8 | 1.9 | 1 | * | * | * |
| 6.5 to 6.9 | 4.8 | 4.3 | 3.7 | 2.9 | 2 | 1 | * | * |
| 7.0 to 7.4 | 5.5 | 5.0 | 4.5 | 3.8 | 3 | 2.1 | 1 | * |
| 7.5 to 7.9 | 6.2 | 5.7 | 5.3 | 4.7 | 3.9 | 3.1 | 2.2 | 1 |
| 8.0 to 8.4 | 6.8 | 6.4 | 6 | 5.5 | 4.8 | 4.1 | 3.2 | 2.2 |
| 8.5 to 8.9 | 7.4 | 7.1 | 6.7 | 6.2 | 5.7 | 5 | 4.2 | 3.3 |
| 9.0 to 9.4 | 8.1 | 7.8 | 7.4 | 7 | 6.5 | 5.9 | 5.2 | 4.4 |
| 9.5 to 9.9 | 8.7 | 8.4 | 8.1 | 7.7 | 7.3 | 6.7 | 6.1 | 5.4 |
| 10.0 to 10.4 | 9.2 | 9 | 8.8 | 8.4 | 8 | 7.6 | 7 | 6.4 |
| 10.5 to 10.9 | 9.8 | 9.5 | 9.4 | 9.1 | 8.7 | 8.3 | 7.8 | 7.2 |
| 11.0 to 11.4 | 10.4 | 10.2 | 10 | 9.7 | 9.4 | 9.1 | 8.6 | 8.1 |
| 11.5 to 11.9 | 11 | 10.8 | 10.6 | 10.4 | 10.1 | 9.8 | 9.4 | 8.9 |
| 12.0 to 12.4 | 11.5 | 11.4 | 11.2 | 11 | 10.7 | 10.5 | 10.1 | 9.7 |
| 12.5 to 12.9 | 12.1 | 11.9 | 11.8 | 11.6 | 11.4 | 11.1 | 10.8 | 10.5 |
| 13.0 to 13.4 | 12.6 | 12.5 | 12.4 | 12.2 | 12 | 11.8 | 11.5 | 11.2 |
| 13.5 to 13.9 | 13.2 | 13.1 | 12.9 | 12.8 | 12.6 | 12.4 | 12.2 | 11.9 |
| 14.0 to 14.4 | 13.7 | 13.6 | 13.5 | 13.4 | 13.2 | 13 | 12.8 | 12.6 |