Official NHA Assessment

Race 7: SOUTH AFRICAN FILLIES SPRINT (Grade 1) brought to you by The Witness (For Fillies and Mares at Weight-For-Age)

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Line Horse
Princess Calla
Reference for assessment
Exact Matches
1 / 10
Calculated = Official
Close Matches
1 / 10
Within 2 points
Significant Diffs
8 / 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    Princess Calla       4    60.0    1    0.00     2.5   127   127          127   +0
2    Desert Miracle       3    60.0    2    3.20     2.0   124   128          128   +4
3    Golden Hostess       2    59.0    3    4.40     1.0   119   128          128   +9
4    Cold Fact            3    60.0    4    5.20     2.0   112   128          128   +16
5    Gimme A Shot         2    59.0    5    5.90     1.0   113   128          128   +15
6    Iphiko               3    60.0    6    6.40     2.0   107   128          128   +21
7    Ameena               2    59.0    7    7.10     1.0   112   128          128   +16
8    Whoa Whoa Whoa (AUS  3    60.0    8    7.80     2.0   108   128          128   +20
9    Stiptelik (AUS)      3    60.0    9    9.10     2.0   108   128          128   +20
10   Aunty Lizzy          3    60.0    10   11.60    2.0   102   128          128   +26
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Princess Calla Line 127 127 127 ✓ Match 2.5
2 Desert Miracle 124 124 128 -4 2.0 -
3 Golden Hostess 119 112 128 -16 1.0 -
4 Cold Fact 112 109 128 -19 2.0 -
5 Gimme A Shot 113 110 128 -18 1.0 -
6 Iphiko 107 111 128 -17 2.0 -
7 Ameena 112 103 128 -25 1.0 -
8 Whoa Whoa Whoa (AUS) 108 108 128 -20 2.0 -
9 Stiptelik (AUS) 108 104 128 -24 2.0 -
10 Aunty Lizzy 102 84 128 -44 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