Official NHA Assessment

Race 2: OPEN A tabGOLD ACCOUNT 031 314 1874 MAIDEN PLATE (For all Maidens)

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Line Horse
Aerial Display
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
7 / 8
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    Aerial Display       5    59.0    1    0.00     0.0   -     -            -     +0
2    Arverni King         5    59.0    2    0.40     0.0   75    5            65    -10
3    Dontstopmenow        3    59.0    3    3.20     5.0   -     -8           -     +0
4    Giants Castle        4    60.0    4    8.00     2.5   58    -3           48    -10
5    Master Of Defense    3    56.5    5    8.50     5.0   62    -15          52    -10
6    Tommy The Kidd       4    60.0    6    9.30     2.5   57    -3           47    -10
7    Red Piano            2    59.0    7    10.40    0.0   71    -            65    -6
8    Tigkita              3    59.0    8    13.20    5.0   -     -10          -     +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Aerial Display Line - 68 - +68 0.0
2 Arverni King 75 86 65 +21 0.0 -
3 Dontstopmenow - 62 - +62 5.0 -
4 Giants Castle 58 64 48 +16 2.5 -
5 Master Of Defense 62 63 52 +11 5.0 -
6 Tommy The Kidd 57 53 47 +6 2.5 -
7 Red Piano 71 63 65 -2 0.0 -
8 Tigkita - 48 - +48 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