Official NHA Assessment

Race 6: PAARL DIAMANT CLASS 4 (F & M) (For Fillies & Mares. Benchmark at 60.0kg = 80)

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Line Horse
Hampstead Heath
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
6 / 8
More than 5 points
Detailed Assessment
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Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
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1    Tokyo Princess       2    55.5    1    0.00     0.0   71    82           77    +6
2    Hampstead Heath      4    60.5    2    1.25     7.0   82    82           82    +0
3    Protect The Dream    3    54.0    3    1.65     9.0   86    64           76    -10
4    Eternal Optimist     2    52.0    4    2.05     0.0   65    78           78    +13
5    Saint Brigid         3    57.5    5    2.80     9.0   76    70           70    -6
6    Kamakazi             4    60.5    6    3.20     7.0   82    80           80    -2
7    Ice Rain             4    61.0    7    3.40     7.0   83    80           80    -3
8    Eureka Diamond       2    54.5    8    15.65    0.0   87    80           80    -7
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tokyo Princess 71 67 77 -10 0.0 -
2 Hampstead Heath Line 82 75 82 -7 7.0
3 Protect The Dream 86 81 76 +5 9.0 -
4 Eternal Optimist 65 62 78 -16 0.0 -
5 Saint Brigid 76 80 70 +10 9.0 -
6 Kamakazi 82 73 80 -7 7.0 -
7 Ice Rain 83 101 80 +21 7.0 -
8 Eureka Diamond 87 81 80 +1 0.0 -
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