Official NHA Assessment

Race 8: FOR HOSPITALITY BOOKINGS CALL 011 681 1796 MR 74 HANDICAP (Open)

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Line Horse
Jaffa
Reference for assessment
Exact Matches
1 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
5 / 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    Page Boy             3    61.5    1    0.00     6.0   77    83           77    +0
2    Prince Of Kildare    4    59.5    2    0.25     3.0   73    85           85    +12
3    Jaffa                3    59.0    3    1.25     6.0   82    82           82    +0
4    Trombolines          3    60.5    4    1.65     6.0   85    84           84    -1
5    Scarlett Heart       2    59.0    5    5.65     0.0   82    90           90    +8
6    Itsnowornever        5    51.5    6    5.75     0.0   62    75           75    +13
7    Brave Viking         5    60.5    7    7.15     0.0   75    93           93    +18
8    Thambi               5    52.0    8    9.95     0.0   58    76           76    +18
9    Six Of All           2    58.5    9    19.25    0.0   81    89           89    +8
99   Tommy Atkins         3    59.5    99   0.00     6.0   -     79           79    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Page Boy 77 79 77 +2 6.0 -
2 Prince Of Kildare 73 80 85 -5 3.0 -
3 Jaffa Line 82 82 82 ✓ Match 6.0
4 Trombolines 85 87 84 +3 6.0 -
5 Scarlett Heart 82 108 90 +18 0.0 -
6 Itsnowornever 62 64 75 -11 0.0 -
7 Brave Viking 75 72 93 -21 0.0 -
8 Thambi 58 55 76 -21 0.0 -
9 Six Of All 81 74 89 -15 0.0 -
99 Tommy Atkins - 83 79 +4 6.0 -
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