Official NHA Assessment

Race 5: SA DERBY 4 APRIL MR 74 HANDICAP (Open)

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Line Horse
Crepuscolo
Reference for assessment
Exact Matches
2 / 11
Calculated = Official
Close Matches
2 / 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    Copper Cliff         2    56.5    1    0.00     0.0   71    68           71    +0
2    Full Go              6    52.0    2    1.00     0.0   52    65           65    +13
3    Repetition           3    60.0    3    1.20     6.0   75    69           69    -6
4    Crepuscolo           4    52.0    4    1.40     3.0   58    58           58    +0
5    Romeo's Magic        7    59.5    5    1.50     0.0   73    79           79    +6
6    Real Stunner         3    60.0    6    2.75     6.0   75    66           66    -9
7    Majalun              3    55.5    7    4.05     6.0   65    56           56    -9
8    Sky Pillar Rock      3    57.5    8    7.75     6.0   78    58           68    -10
9    Flag Bearer          3    52.5    9    11.00    6.0   64    48           54    -10
99   Bellerophon          3    58.0    99   0.00     6.0   -     59           59    +0
99   Equilateral          3    55.5    99   0.00     6.0   -     54           54    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Copper Cliff 71 75 71 +4 0.0 -
2 Full Go 52 59 65 -6 0.0 -
3 Repetition 75 74 69 +5 6.0 -
4 Crepuscolo Line 58 58 58 ✓ Match 3.0
5 Romeo's Magic 73 73 79 -6 0.0 -
6 Real Stunner 75 74 66 +8 6.0 -
7 Majalun 65 56 56 ✓ Match 6.0 -
8 Sky Pillar Rock 78 81 68 +13 6.0 -
9 Flag Bearer 64 60 54 +6 6.0 -
99 Bellerophon - 89 59 +30 6.0 -
99 Equilateral - 82 54 +28 6.0 -
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