Official NHA Assessment

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

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Line Horse
Kentucky Lassie
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
0 / 10
Within 2 points
Significant Diffs
8 / 10
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    Desert Cloud         3    60.0    1    0.00     5.0   72    -            72    +0
2    Kentucky Lassie      3    60.0    2    0.25     5.0   -     -            -     +0
3    Laydelay             2    60.0    3    0.30     3.5   78    3            68    -10
4    Stone Of Scone       2    60.0    4    1.30     3.5   75    3            65    -10
5    Mediterraneanflame   3    60.0    5    2.30     5.0   60    -            56    -4
6    Ripsnorter           4    60.0    6    16.55    6.0   57    -2           47    -10
7    One Summer           2    60.0    7    17.55    3.5   67    3            57    -10
99   Night In Japan       3    56.0    99   0.00     5.0   -     -8           -8    +0
99   Miss Mackie          3    60.0    99   0.00     5.0   -     -            -     +0
99   Stormin Attack       3    56.0    99   0.00     5.0   -     -8           -8    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Desert Cloud 72 78 72 +6 5.0 -
2 Kentucky Lassie Line - 77 - +77 5.0
3 Laydelay 78 76 68 +8 3.5 -
4 Stone Of Scone 75 72 65 +7 3.5 -
5 Mediterraneanflame 60 60 56 +4 5.0 -
6 Ripsnorter 57 57 47 +10 6.0 -
7 One Summer 67 69 57 +12 3.5 -
99 Night In Japan - 49 -8 +57 5.0 -
99 Miss Mackie - 49 - - 5.0 -
99 Stormin Attack - 46 -8 +54 5.0 -
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