Official NHA Assessment

Race 5: RACEHORSE OWNERS ASSOCIATION MAIDEN PLATE (For all Maidens. R15 000 Win bonus ROA Members)

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Line Horse
Desert Fox
Reference for assessment
Exact Matches
1 / 11
Calculated = Official
Close Matches
3 / 11
Within 2 points
Significant Diffs
7 / 11
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    Every Cloud          3    57.5    1    0.00     2.5   63    61           61    -2
2    Sword Of Mercy       3    60.0    2    5.25     2.5   75    66           66    -9
3    Desert Fox           3    60.0    3    6.00     2.5   66    66           66    +0
4    King's Express       3    60.0    4    9.50     2.5   -     66           66    +66
5    Williamson           2    60.0    5    10.00    0.0   68    71           71    +3
6    Atchison Topeka      3    56.5    6    10.10    2.5   55    59           59    +4
7    Volte Face           3    60.0    7    10.50    2.5   50    66           66    +16
8    I'm A Man            2    60.0    8    13.00    0.0   68    71           71    +3
9    Master Of Defense    3    60.0    9    17.00    2.5   63    66           66    +3
10   Raining Rubies       5    56.5    10   22.00    0.0   59    64           64    +5
11   Flight De Grace      5    56.5    11   33.00    0.0   45    64           64    +19
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Every Cloud 63 72 61 +11 2.5 -
2 Sword Of Mercy 75 65 66 -1 2.5 -
3 Desert Fox Line 66 57 66 -9 2.5
4 King's Express - 102 66 +36 2.5 -
5 Williamson 68 62 71 -9 0.0 -
6 Atchison Topeka 55 51 59 -8 2.5 -
7 Volte Face 50 66 66 ✓ Match 2.5 -
8 I'm A Man 68 69 71 -2 0.0 -
9 Master Of Defense 63 63 66 -3 2.5 -
10 Raining Rubies 59 75 64 +11 0.0 -
11 Flight De Grace 45 45 64 -19 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