Official NHA Assessment

Race 5: WILGERBOSDRIFT ACACIA STAKES (Listed) (For Fillies and Mares)

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Line Horse
Perfect Witness
Reference for assessment
Exact Matches
1 / 11
Calculated = Official
Close Matches
3 / 11
Within 2 points
Significant Diffs
7 / 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    Silver Hills         3    56.0    1    0.00     3.0   102   100          100   -2
2    Humdinger            3    60.0    2    0.40     3.0   114   113          113   -1
3    Perfect Witness      3    58.0    3    4.00     3.0   105   105          105   +0
4    Terra Time           3    54.5    4    6.25     3.0   96    97           97    +1
5    Lady Of Power        2    58.0    5    6.50     0.0   105   110          110   +5
6    Good Queen Bess (GB  4    52.5    6    7.75     1.5   94    96           96    +2
7    Bonete               3    54.0    7    8.25     3.0   95    96           96    +1
8    Juliet Tango         6    54.0    8    14.75    0.0   98    102          102   +4
9    Reny                 2    56.0    9    15.25    0.0   101   106          106   +5
10   Peach Daiquiri       2    60.0    10   99.99    0.0   110   114          114   +4
99   Sign Of Fate         4    50.0    99   0.00     1.5   -     91           91    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Silver Hills 102 108 100 +8 3.0 -
2 Humdinger 114 119 113 +6 3.0 -
3 Perfect Witness Line 105 105 105 ✓ Match 3.0
4 Terra Time 96 96 97 -1 3.0 -
5 Lady Of Power 105 100 110 -10 0.0 -
6 Good Queen Bess (GB) 94 97 96 +1 1.5 -
7 Bonete 95 85 96 -11 3.0 -
8 Juliet Tango 98 81 102 -21 0.0 -
9 Reny 101 91 106 -15 0.0 -
10 Peach Daiquiri 110 110 114 -4 0.0 -
99 Sign Of Fate - 74 91 -17 1.5 -
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