Official NHA Assessment

Race 1: WELCOME TO NELSON MANDELA BAY RACING WORK RIDERS MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Back To Formentera
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
0 / 9
Within 2 points
Significant Diffs
8 / 9
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    Princess Deb's       3    60.0    1    0.00     3.5   -     63           6     +6
2    Angel Deb's          3    60.0    2    0.10     3.5   -     63           63    +63
3    Klaserie             3    60.0    3    0.15     3.5   50    63           63    +13
4    Back To Formentera   3    60.0    4    4.15     3.5   63    63           63    +0
5    European Summer      3    60.0    5    6.90     3.5   59    63           63    +4
6    Rio Supremo          3    60.0    6    7.65     3.5   67    63           63    -4
7    A Foreign Affair     3    60.0    7    8.15     3.5   58    63           63    +5
8    Miss United States   3    60.0    8    9.40     3.5   58    63           63    +5
9    Hola Chiquita        5    60.0    9    10.90    0.0   47    70           70    +23
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Princess Deb's - 80 6 +74 3.5 -
2 Angel Deb's - 78 63 +15 3.5 -
3 Klaserie 50 57 63 -6 3.5 -
4 Back To Formentera Line 63 60 63 -3 3.5
5 European Summer 59 77 63 +14 3.5 -
6 Rio Supremo 67 52 63 -11 3.5 -
7 A Foreign Affair 58 49 63 -14 3.5 -
8 Miss United States 58 52 63 -11 3.5 -
9 Hola Chiquita 47 38 70 -32 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