Official NHA Assessment

Race 7: WILGERBOSDRIFT SA OAKS (Grade 2) (For 3 year-old Fillies (3rd Leg of SA Triple Tiara))

Back to Race
Line Horse
Evening Primrose
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
6 / 10
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------
Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
------------------------------------------------------------------------------------------------------------------------
1    Rain In Holland      3    60.0    1    0.00     5.5   118   81           81    -37
2    Light Of The Moon    3    60.0    2    0.75     5.5   76    86           86    +10
3    Evening Primrose     3    60.0    3    7.25     5.5   81    81           81    +0
4    Ontheverge           3    60.0    4    10.50    5.5   72    81           81    +9
5    Greengrowthelilacs   3    60.0    5    11.00    5.5   76    81           81    +5
6    Princess Kesh        3    60.0    6    13.50    5.5   83    81           81    -2
7    Go Dream Machine     3    60.0    7    14.25    5.5   75    81           81    +6
8    Eternity Ring        3    60.0    8    15.25    5.5   103   81           93    -10
9    Clafoutis            3    60.0    9    19.75    5.5   105   81           95    -10
99   Quiet Rebellion      3    60.0    99   0.00     5.5   -     81           81    +0
------------------------------------------------------------------------------------------------------------------------

Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Rain In Holland 118 120 81 +39 5.5 -
2 Light Of The Moon 76 107 86 +21 5.5 -
3 Evening Primrose Line 81 77 81 -4 5.5
4 Ontheverge 72 73 81 -8 5.5 -
5 Greengrowthelilacs 76 79 81 -2 5.5 -
6 Princess Kesh 83 77 81 -4 5.5 -
7 Go Dream Machine 75 52 81 -29 5.5 -
8 Eternity Ring 103 80 93 -13 5.5 -
9 Clafoutis 105 96 95 +1 5.5 -
99 Quiet Rebellion - 74 81 -7 5.5 -
Assessment Methodology
Calculation Steps:
  1. Identify Line Horse - consistent performer used as reference
  2. Calculate WFA Allowance based on age, distance, and month
  3. Apply Drag Adjustment for beaten margin
  4. Calculate Actual Weight Performance:
    Weight - Drag - WFA
  5. Compare to Line Horse to determine race rating
  6. Apply special rules (maiden caps, layoff allowance)
Key Formulas:
  • Drag Effect: Varies by distance (see Benchmarks page)
  • 1 length ≈ 1kg at 1 mile (1600m)
  • WFA Scale: Based on Admiral Rous's 1855 table
  • Rating Points: 1kg = 2 rating points