Official NHA Assessment

Race 1: 4RACING WELCOMES YOU WORK RIDERS MAIDEN PLATE (ROA) (F & M) (For Maiden F & M. R15 000 Win bonus ROA Members)

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Line Horse
Queen Britanna
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
0 / 7
Within 2 points
Significant Diffs
5 / 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    Maith An Cailin      2    60.0    1    0.00     0.0   68    63           63    -5
2    On The Guest List    2    60.0    2    0.50     0.0   65    70           70    +5
3    Queen Britanna       2    60.0    3    2.50     0.0   67    67           67    +0
4    Dame Colleen         3    60.0    4    12.50    4.5   48    54           54    +6
5    Dusky Rose           3    60.0    5    13.50    4.5   60    54           54    -6
6    Impression           3    60.0    6    14.50    4.5   67    54           57    -10
7    Priya's Treasure     4    60.0    7    19.00    2.0   -     59           59    +59
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Maith An Cailin 68 68 63 +5 0.0 -
2 On The Guest List 65 57 70 -13 0.0 -
3 Queen Britanna Line 67 57 67 -10 0.0
4 Dame Colleen 48 46 54 -8 4.5 -
5 Dusky Rose 60 58 54 +4 4.5 -
6 Impression 67 51 57 -6 4.5 -
7 Priya's Treasure - - 59 -59 2.0 -
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