Official NHA Assessment

Race 1: MERRY MZANSI MAIDEN PLATE (For all Maidens)

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Line Horse
That's All Brother
Reference for assessment
Exact Matches
1 / 11
Calculated = Official
Close Matches
5 / 11
Within 2 points
Significant Diffs
5 / 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    Double Causeway      3    59.0    1    0.00     5.0   -     69           6     +6
2    Good Omen            2    57.5    2    0.70     0.0   74    81           81    +7
3    Hammerhead           3    59.0    3    1.10     5.0   -     73           73    +73
4    That's All Brother   3    56.0    4    2.20     5.0   66    66           66    +0
5    Owner Of Creation    3    57.5    5    2.50     5.0   57    68           68    +11
6    Vencedor             2    60.0    6    2.80     0.0   66    83           83    +17
7    Full Monty           3    59.0    7    3.00     5.0   -     71           71    +71
8    Stampede Ahead       2    56.0    8    3.25     0.0   77    75           75    -2
9    William Of Orange    2    59.0    9    4.65     0.0   71    79           79    +8
10   Bell Of Angelus      2    56.0    10   11.25    0.0   72    73           73    +1
11   Mr Pleasure          3    56.0    11   14.15    5.0   48    63           63    +15
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Double Causeway - 81 6 +75 5.0 -
2 Good Omen 74 74 81 -7 0.0 -
3 Hammerhead - 74 73 +1 5.0 -
4 That's All Brother Line 66 66 66 ✓ Match 5.0
5 Owner Of Creation 57 65 68 -3 5.0 -
6 Vencedor 66 67 83 -16 0.0 -
7 Full Monty - 70 71 -1 5.0 -
8 Stampede Ahead 77 76 75 +1 0.0 -
9 William Of Orange 71 63 79 -16 0.0 -
10 Bell Of Angelus 72 71 73 -2 0.0 -
11 Mr Pleasure 48 45 63 -18 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