Official NHA Assessment

Race 3: Greyville Convention Centre MAIDEN PLATE (For all Maidens)

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Line Horse
That's All Brother
Reference for assessment
Exact Matches
3 / 10
Calculated = Official
Close Matches
5 / 10
Within 2 points
Significant Diffs
4 / 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    Vencedor             2    58.5    1    0.00     0.0   64    73           70    +6
2    That's All Brother   3    60.0    2    0.25     5.0   66    66           66    +0
3    Psyche               3    56.0    3    1.05     5.0   -     62           62    +62
4    Good Omen            2    57.5    4    2.15     0.0   77    74           74    -3
5    Owner Of Creation    3    60.0    5    3.45     5.0   64    67           67    +3
6    Donmagoo             3    59.0    6    3.70     5.0   72    65           65    -7
7    Light The Fire       2    59.0    7    9.70     0.0   74    74           74    +0
8    Star Fall            2    59.0    8    18.60    0.0   60    74           74    +14
99   Oxford Road          3    60.0    99   0.00     5.0   -     66           66    +0
99   Naval Officer        4    60.0    99   0.00     3.0   -     70           70    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Vencedor 64 67 70 -3 0.0 -
2 That's All Brother Line 66 66 66 ✓ Match 5.0
3 Psyche - 78 62 +16 5.0 -
4 Good Omen 77 74 74 ✓ Match 0.0 -
5 Owner Of Creation 64 65 67 -2 5.0 -
6 Donmagoo 72 63 65 -2 5.0 -
7 Light The Fire 74 74 74 ✓ Match 0.0 -
8 Star Fall 60 55 74 -19 0.0 -
99 Oxford Road - 46 66 -20 5.0 -
99 Naval Officer - - 70 -70 3.0 -
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