Official NHA Assessment

Race 3: BACKCHAT CLASS 3 (F & M) (For Fillies & Mares. Benchmark at 60.0kg = 98)

Back to Race
Line Horse
Perilla
Reference for assessment
Exact Matches
2 / 9
Calculated = Official
Close Matches
5 / 9
Within 2 points
Significant Diffs
3 / 9
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    De Vlugge            2    55.5    1    0.00     0.0   89    87           87    -2
2    Sovereign Grant      4    56.5    2    1.50     0.5   91    91           91    +0
3    Perilla              5    57.0    3    3.10     0.0   92    92           92    +0
4    Miss Ladyaterix      3    53.5    4    3.60     1.5   90    81           81    -9
5    One Smart Cookie     4    58.5    5    3.90     0.5   95    93           93    -2
6    Juliet Tango         6    54.0    6    5.00     0.0   86    84           84    -2
7    Forward Motion       3    60.0    7    5.30     1.5   98    93           93    -5
8    Limitless Sky        2    58.0    8    10.80    0.0   98    92           92    -6
99   Bright And Brazen    2    56.0    99   0.00     0.0   -     88           88    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 De Vlugge 89 89 87 +2 0.0 -
2 Sovereign Grant 91 91 91 ✓ Match 0.5 -
3 Perilla Line 92 92 92 ✓ Match 0.0
4 Miss Ladyaterix 90 90 81 +9 1.5 -
5 One Smart Cookie 95 95 93 +2 0.5 -
6 Juliet Tango 86 86 84 +2 0.0 -
7 Forward Motion 98 98 93 +5 1.5 -
8 Limitless Sky 98 98 92 +6 0.0 -
99 Bright And Brazen - 97 88 +9 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