Official NHA Assessment

Race 1: OKAPI LADIES INTERNATIONAL (For 3yo & older F&M rated nett 91 and below (NBT))

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Line Horse
Distinction
Reference for assessment
Exact Matches
0 / 12
Calculated = Official
Close Matches
2 / 12
Within 2 points
Significant Diffs
10 / 12
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    Pacific Green        2    59.0    1    0.00     3.5   89    90           90    +1
2    Distinction          2    59.0    2    3.25     3.5   90    90           90    +0
3    Certainly            2    59.0    3    3.65     3.5   87    90           90    +3
4    Miss Greenlight      3    61.0    4    5.65     5.0   84    91           91    +7
5    Betty Boop           2    59.0    5    6.90     3.5   87    90           90    +3
6    Bonika               2    63.0    6    7.65     3.5   98    98           98    +0
7    Butterfly Beauty     2    61.0    7    7.70     3.5   93    94           94    +1
8    Country Time         5    57.0    8    8.00     0.0   83    93           93    +10
9    Ancient Epic         3    63.0    9    9.75     5.0   91    95           95    +4
10   Vivacious Spirit     2    61.0    10   9.80     3.5   92    94           94    +2
11   Say Yes              2    56.0    11   20.05    3.5   81    84           84    +3
12   Island Treasure      3    57.0    12   99.99    5.0   77    83           83    +6
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Pacific Green 89 91 90 +1 3.5 -
2 Distinction Line 90 97 90 +7 3.5
3 Certainly 87 80 90 -10 3.5 -
4 Miss Greenlight 84 100 91 +9 5.0 -
5 Betty Boop 87 88 90 -2 3.5 -
6 Bonika 98 80 98 -18 3.5 -
7 Butterfly Beauty 93 80 94 -14 3.5 -
8 Country Time 83 62 93 -31 0.0 -
9 Ancient Epic 91 88 95 -7 5.0 -
10 Vivacious Spirit 92 78 94 -16 3.5 -
11 Say Yes 81 90 84 +6 3.5 -
12 Island Treasure 77 73 83 -10 5.0 -
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