Official NHA Assessment

Race 5: SA DERBY 4 APRIL FM 93 DIVIDED HANDICAP (F & M) (For Fillies and Mares)

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Line Horse
Bosum Buddy
Reference for assessment
Exact Matches
1 / 6
Calculated = Official
Close Matches
3 / 6
Within 2 points
Significant Diffs
1 / 6
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    Poblano              3    60.5    1    0.00     5.0   94    94           94    +0
2    Caroline Island      2    54.0    2    1.80     3.5   88    84           84    -4
3    Bosum Buddy          3    56.5    3    2.80     5.0   86    86           86    +0
4    Miss Lia             3    61.0    4    3.40     5.0   95    95           95    +0
5    Roaming Spirit       3    58.0    5    4.40     5.0   89    89           89    +0
99   Let's Go Lola        2    55.5    99   0.00     3.5   -     87           87    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Poblano 94 100 94 +6 5.0 -
2 Caroline Island 88 88 84 +4 3.5 -
3 Bosum Buddy Line 86 85 86 -1 5.0
4 Miss Lia 95 95 95 ✓ Match 5.0 -
5 Roaming Spirit 89 87 89 -2 5.0 -
99 Let's Go Lola - 91 87 +4 3.5 -
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