Official NHA Assessment

Race 4: PROGRESS PLATE (For Maidens & 1,2 & 3 time winners)

Back to Race
Line Horse
River Power
Reference for assessment
Exact Matches
0 / 4
Calculated = Official
Close Matches
0 / 4
Within 2 points
Significant Diffs
3 / 4
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------
Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
------------------------------------------------------------------------------------------------------------------------
1    Jet Green            4    52.0    1    0.00     2.5   57    65           63    +6
2    River Power          3    59.0    2    2.50     5.0   76    76           76    +0
3    Cosmic Event         5    57.5    3    6.00     0.0   86    81           81    -5
4    Guerra               4    60.0    4    7.75     2.5   84    81           81    -3
------------------------------------------------------------------------------------------------------------------------

Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Jet Green 57 54 63 -9 2.5 -
2 River Power Line 76 97 76 +21 5.0
3 Cosmic Event 86 70 81 -11 0.0 -
4 Guerra 84 86 81 +5 2.5 -
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