Official NHA Assessment

Race 9: NEXT TURFFONTEIN RACE MEETING SATURDAY 16 SEPTEMBER CLASSIFIED STAKES (For horses with nett rating of 75 and below)

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Line Horse
Inventrix
Reference for assessment
Exact Matches
1 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
6 / 11
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    Micke's Bomb         4    55.0    1    0.00     11.0  79    59           59    -20
2    Kalahari Blue        2    60.0    2    0.80     6.5   75    78           78    +3
3    Inventrix            2    54.5    3    1.00     6.5   67    67           67    +0
4    Rock On Captain      3    50.5    4    4.25     9.5   52    53           53    +1
5    Tuscan Gold          2    60.0    5    4.65     6.5   73    78           78    +5
6    Galla Vanting        2    58.5    6    5.40     6.5   74    75           75    +1
7    Var Park             5    58.0    7    6.40     0.0   71    87           87    +16
8    Kit Kat Katie        2    52.5    8    7.80     6.5   61    63           63    +2
99   Nettleton            3    54.5    99   0.00     9.5   -     61           61    +0
99   Try Me               4    56.5    99   0.00     11.0  -     62           62    +0
99   Ambrym               2    58.5    99   0.00     6.5   -     75           75    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Micke's Bomb 79 60 59 +1 11.0 -
2 Kalahari Blue 75 75 78 -3 6.5 -
3 Inventrix Line 67 73 67 +6 6.5
4 Rock On Captain 52 57 53 +4 9.5 -
5 Tuscan Gold 73 84 78 +6 6.5 -
6 Galla Vanting 74 54 75 -21 6.5 -
7 Var Park 71 87 87 ✓ Match 0.0 -
8 Kit Kat Katie 61 60 63 -3 6.5 -
99 Nettleton - 100 61 +39 9.5 -
99 Try Me - 52 62 -10 11.0 -
99 Ambrym - 82 75 +7 6.5 -
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