Official NHA Assessment

Race 1: WELCOME TO THE TOPBET SPRING CHALLENGE RACEDAY MAIDEN PLATE (For all Maidens)

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Line Horse
Gregor Macgregor
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
1 / 9
Within 2 points
Significant Diffs
7 / 9
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    Ignatius             2    58.0    1    0.00     0.0   -     64           6     +6
2    Run For Cover        5    58.0    2    0.50     0.0   -     69           69    +69
3    Gregor Macgregor     4    60.0    3    9.75     5.0   58    58           58    +0
4    King Of Venus        4    60.0    4    11.50    5.0   -     58           58    +58
5    What Say You         2    58.0    5    12.10    0.0   74    64           64    -10
6    Gimme A Diamond      2    58.0    6    12.50    0.0   75    64           65    -10
7    The Longest Time     2    58.0    7    23.25    0.0   60    64           64    +4
8    Great Scott          3    58.0    8    28.75    8.0   -     48           48    +48
9    Super World          3    58.0    9    29.00    8.0   -     48           48    +48
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Ignatius - 70 6 +64 0.0 -
2 Run For Cover - 70 69 +1 0.0 -
3 Gregor Macgregor Line 58 63 58 +5 5.0
4 King Of Venus - 87 58 +29 5.0 -
5 What Say You 74 72 64 +8 0.0 -
6 Gimme A Diamond 75 54 65 -11 0.0 -
7 The Longest Time 60 57 64 -7 0.0 -
8 Great Scott - - 48 -48 8.0 -
9 Super World - - 48 -48 8.0 -
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