Official NHA Assessment

Race 1: WSB SPINA WINA MIDDLE STAKES (For horses with nett rating of 101 and below)

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Line Horse
Vegas Hi Rise
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
3 / 7
Within 2 points
Significant Diffs
4 / 7
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    Sheldon              6    60.0    1    0.00     0.0   95    93           93    -2
2    Mini Coop            3    54.5    2    2.10     3.5   81    75           75    -6
3    Vegas Hi Rise        6    60.0    3    2.20     0.0   93    93           93    +0
4    Lucy English         3    57.5    4    2.30     3.5   92    81           82    -10
5    Expeditioner         3    54.5    5    2.80     3.5   82    75           75    -7
6    Rozara               3    51.0    6    3.50     3.5   84    68           74    -10
7    Godswood             4    62.0    7    4.25     4.0   101   89           91    -10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Sheldon 95 106 93 +13 0.0 -
2 Mini Coop 81 76 75 +1 3.5 -
3 Vegas Hi Rise Line 93 71 93 -22 0.0
4 Lucy English 92 90 82 +8 3.5 -
5 Expeditioner 82 76 75 +1 3.5 -
6 Rozara 84 73 74 -1 3.5 -
7 Godswood 101 106 91 +15 4.0 -
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