Official NHA Assessment

Race 1: ROSS ROBERTSON MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Onceinabluemoon
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
1 / 7
Within 2 points
Significant Diffs
3 / 7
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    Shivering Light      3    60.0    1    0.00     4.5   -     70           6     +6
2    Onceinabluemoon      2    58.5    2    1.10     3.0   70    70           70    +0
3    Wings Of Kildra      3    60.0    3    7.10     4.5   74    70           70    -4
4    Ada Lovelace         2    60.0    4    8.85     3.0   60    73           73    +13
5    Sand Script          3    60.0    5    16.45    4.5   -     70           70    +70
99   Gathering Winter     2    60.0    99   0.00     3.0   -     73           73    +0
99   Maddy's Mary         3    60.0    99   0.00     4.5   -     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 Shivering Light - 78 6 +72 4.5 -
2 Onceinabluemoon Line 70 75 70 +5 3.0
3 Wings Of Kildra 74 74 70 +4 4.5 -
4 Ada Lovelace 60 72 73 -1 3.0 -
5 Sand Script - 78 70 +8 4.5 -
99 Gathering Winter - 68 73 -5 3.0 -
99 Maddy's Mary - - 70 -70 4.5 -
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