Official NHA Assessment

Race 6: BORROWDALE SPRINT (Open)

Back to Race
Line Horse
Brianna
Reference for assessment
Exact Matches
2 / 4
Calculated = Official
Close Matches
2 / 4
Within 2 points
Significant Diffs
2 / 4
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------
Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
------------------------------------------------------------------------------------------------------------------------
1    Jet Mirage           3    58.5    1    0.00     7.5   94    103          100   +6
2    Jubilee              7    56.5    2    0.50     0.0   89    114          114   +25
3    Brianna              4    60.0    3    2.00     9.0   103   103          103   +0
4    Emerald Floe         4    54.0    4    3.75     9.0   89    91           91    +2
------------------------------------------------------------------------------------------------------------------------

Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Jet Mirage 94 100 100 ✓ Match 7.5 -
2 Jubilee 89 72 114 -42 0.0 -
3 Brianna Line 103 103 103 ✓ Match 9.0
4 Emerald Floe 89 82 91 -9 9.0 -
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