Official NHA Assessment

Race 6: TOPBET JOBURG SPRING F & M CHALLENGE (Grade 2) (For Fillies and Mares at Weight for age + Penalties)

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Line Horse
Mercury Rising
Reference for assessment
Exact Matches
1 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
7 / 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    Humdinger            3    59.0    1    0.00     8.0   95    104          101   +6
2    Desert Miracle       3    59.0    2    0.20     8.0   115   104          105   -10
3    Gimme A Shot         2    51.5    3    1.70     0.0   102   108          108   +6
4    Mercury Rising       3    59.0    4    2.45     8.0   106   106          106   +0
5    Homely Girl          3    60.0    5    3.95     8.0   108   107          107   -1
6    Queen Of Shadows     3    59.0    6    5.45     8.0   92    104          104   +12
7    Big Burn             3    60.0    7    6.15     8.0   122   106          112   -10
8    Supreme Quest        3    59.0    8    6.20     8.0   108   104          104   -4
9    May Queen            5    59.5    9    8.95     0.0   93    121          121   +28
10   Lucy In The Sky      4    59.5    10   11.20    5.0   96    111          111   +15
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Humdinger 95 119 101 +18 8.0 -
2 Desert Miracle 115 124 105 +19 8.0 -
3 Gimme A Shot 102 110 108 +2 0.0 -
4 Mercury Rising Line 106 106 106 ✓ Match 8.0
5 Homely Girl 108 99 107 -8 8.0 -
6 Queen Of Shadows 92 95 104 -9 8.0 -
7 Big Burn 122 115 112 +3 8.0 -
8 Supreme Quest 108 92 104 -12 8.0 -
9 May Queen 93 90 121 -31 0.0 -
10 Lucy In The Sky 96 74 111 -37 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