Official NHA Assessment

Race 7: GUINEAS TRIAL (3 year olds)

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Line Horse
Cutback
Reference for assessment
Exact Matches
2 / 5
Calculated = Official
Close Matches
3 / 5
Within 2 points
Significant Diffs
2 / 5
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    Cutback              6    60.0    1    0.00     0.0   62    62           62    +0
2    Keen Spirit          3    60.0    2    1.50     5.0   61    55           55    -6
3    Ian's Ferrari        3    57.5    3    1.55     5.0   60    50           50    -10
4    Days Gone By         3    59.5    4    4.55     5.0   57    51           51    -6
5    Sweet Opportunity    3    60.0    5    13.55    5.0   60    52           52    -8
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Cutback Line 62 63 62 +1 0.0
2 Keen Spirit 61 71 55 +16 5.0 -
3 Ian's Ferrari 60 63 50 +13 5.0 -
4 Days Gone By 57 51 51 ✓ Match 5.0 -
5 Sweet Opportunity 60 52 52 ✓ Match 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