Official NHA Assessment

Race 7: SA DERBY 4 APRIL FM 84 HANDICAP (F & M) (For Fillies and Mares)

Back to Race
Line Horse
Mystical Miss
Reference for assessment
Exact Matches
2 / 9
Calculated = Official
Close Matches
2 / 9
Within 2 points
Significant Diffs
3 / 9
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------
Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
------------------------------------------------------------------------------------------------------------------------
1    Precocious           2    58.0    1    0.00     3.0   94    86           94    +0
2    Mystical Miss        2    56.5    2    2.00     3.0   83    83           83    +0
3    Valieva              3    57.5    3    3.25     4.5   79    82           82    +3
4    Maverick Queen       3    56.5    4    3.55     4.5   77    80           80    +3
5    Jazz Pianist         2    56.0    5    3.75     3.0   82    82           82    +0
6    Plumbago Park        2    55.0    6    5.25     3.0   79    80           80    +1
7    Amazonian            2    55.5    7    7.25     3.0   81    81           81    +0
8    Bosum Buddy          3    61.0    8    7.55     4.5   86    89           89    +3
99   Gaslight Dancer      2    57.5    99   0.00     3.0   -     85           85    +0
------------------------------------------------------------------------------------------------------------------------

Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Precocious 94 106 94 +12 3.0 -
2 Mystical Miss Line 83 83 83 ✓ Match 3.0
3 Valieva 79 78 82 -4 4.5 -
4 Maverick Queen 77 76 80 -4 4.5 -
5 Jazz Pianist 82 79 82 -3 3.0 -
6 Plumbago Park 79 72 80 -8 3.0 -
7 Amazonian 81 73 81 -8 3.0 -
8 Bosum Buddy 86 85 89 -4 4.5 -
99 Gaslight Dancer - 85 85 ✓ Match 3.0 -
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