Official NHA Assessment

Race 3: NEW TURF CARRIERS WESTERN CAPE STAYERS (Grade 3) (Open to horses aged 3 years or older)

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Line Horse
Navajo Nation
Reference for assessment
Exact Matches
2 / 8
Calculated = Official
Close Matches
2 / 8
Within 2 points
Significant Diffs
4 / 8
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    Ahead Of The Facts   3    57.5    1    0.00     8.0   97    91           91    -6
2    Navajo Nation        4    59.0    2    3.00     4.5   104   104          104   +0
3    Holding Thumbs       4    60.0    3    3.75     4.5   119   105          109   -10
4    Master Redoute       3    59.0    4    4.05     8.0   114   96           104   -10
5    Magic Verse          3    59.0    5    5.55     8.0   116   94           106   -10
6    Triple Time          5    59.0    6    13.05    0.0   107   110          110   +3
7    Bournemouth          5    59.0    7    14.55    0.0   111   110          110   -1
8    Zatara Magic         5    59.0    8    16.55    0.0   114   110          110   -4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Ahead Of The Facts 97 110 91 +19 8.0 -
2 Navajo Nation Line 104 104 104 ✓ Match 4.5
3 Holding Thumbs 119 119 109 +10 4.5 -
4 Master Redoute 114 113 104 +9 8.0 -
5 Magic Verse 116 115 106 +9 8.0 -
6 Triple Time 107 105 110 -5 0.0 -
7 Bournemouth 111 110 110 ✓ Match 0.0 -
8 Zatara Magic 114 114 110 +4 0.0 -
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