Official NHA Assessment

Race 5: CLASSIFIED STAKES (For horses with nett rating of 71 and below)

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Line Horse
Differentiate
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
0 / 7
Within 2 points
Significant Diffs
6 / 7
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    Obscure              4    58.5    1    0.00     2.5   64    54           54    -10
2    Differentiate        5    56.5    2    1.25     0.0   61    61           61    +0
3    Viscountess Vivien   6    56.5    3    3.25     0.0   62    58           58    -4
4    Deposition           6    60.0    4    5.00     0.0   60    62           62    +2
5    Days Gone By         3    48.5    5    11.00    5.0   57    29           47    -10
6    Seattle Frost        5    56.0    6    11.25    0.0   52    54           54    +2
99   Moxie                6    56.5    99   0.00     0.0   -     55           55    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Obscure 64 87 54 +33 2.5 -
2 Differentiate Line 61 72 61 +11 0.0
3 Viscountess Vivien 62 72 58 +14 0.0 -
4 Deposition 60 68 62 +6 0.0 -
5 Days Gone By 57 51 47 +4 5.0 -
6 Seattle Frost 52 48 54 -6 0.0 -
99 Moxie - 62 55 +7 0.0 -
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