Official NHA Assessment

Race 8: NEXT VAAL RACEMEETING THURSDAY 04 SEPTEMBER MIDDLE STAKES (For horses with nett rating of 105 and below)

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Line Horse
Vesuvio
Reference for assessment
Exact Matches
0 / 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    Royal Edition        4    54.0    1    0.00     6.0   88    71           71    -17
2    Vesuvio              5    54.0    2    0.90     0.0   89    89           89    +0
3    Hawkbill             4    58.0    3    1.60     6.0   95    84           85    -10
4    Mount Darwin         3    54.0    4    3.00     9.5   89    67           79    -10
5    Street Art           3    54.0    5    4.25     9.5   87    66           77    -10
6    Eiger Sanction       3    50.0    6    4.45     9.5   81    57           71    -10
7    Teo Torriatte        4    54.0    7    6.05     6.0   90    71           80    -10
8    King's Express       3    60.0    8    6.55     9.5   100   76           90    -10
9    Silent War           3    58.0    9    7.35     9.5   95    72           85    -10
10   Arumugam             6    54.0    10   8.75     0.0   87    83           83    -4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Royal Edition 88 92 71 +21 6.0 -
2 Vesuvio Line 89 85 89 -4 0.0
3 Hawkbill 95 100 85 +15 6.0 -
4 Mount Darwin 89 81 79 +2 9.5 -
5 Street Art 87 78 77 +1 9.5 -
6 Eiger Sanction 81 79 71 +8 9.5 -
7 Teo Torriatte 90 94 80 +14 6.0 -
8 King's Express 100 102 90 +12 9.5 -
9 Silent War 95 91 85 +6 9.5 -
10 Arumugam 87 74 83 -9 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