Official NHA Assessment

Race 3: NIGHTINGALE MAIDEN PLATE (F & M) (For Maiden F&M. R15 000 Win bonus ROA Members)

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Line Horse
Mayenne
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
0 / 11
Within 2 points
Significant Diffs
9 / 11
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    Bonnaroo             3    60.0    1    0.00     3.5   -     -            -     +0
2    Risky Business       3    60.0    2    2.00     3.5   63    -            63    +0
3    Nazdarovya           3    60.0    3    3.00     3.5   57    -            56    -1
4    Mayenne              3    60.0    4    3.75     3.5   -     -            -     +0
5    Mercurial Jet        3    60.0    5    4.00     3.5   -     -            -     +0
6    Ebullience           3    60.0    6    5.00     3.5   -     -            -     +0
7    Love Bite            3    60.0    7    7.00     3.5   62    -            56    -6
8    Tracy's Princess     3    60.0    8    7.75     3.5   66    -            59    -7
9    Wolf Moon            3    60.0    9    15.25    3.5   20    -            12    -8
10   Lexi Lou             3    60.0    10   27.75    3.5   -     -            -     +0
99   Silk Garden          3    60.0    99   0.00     3.5   -     -            -     +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Bonnaroo - 84 - +84 3.5 -
2 Risky Business 63 75 63 +12 3.5 -
3 Nazdarovya 57 63 56 +7 3.5 -
4 Mayenne Line - 61 - +61 3.5
5 Mercurial Jet - 59 - +59 3.5 -
6 Ebullience - 49 - +49 3.5 -
7 Love Bite 62 65 56 +9 3.5 -
8 Tracy's Princess 66 64 59 +5 3.5 -
9 Wolf Moon 20 30 12 +18 3.5 -
10 Lexi Lou - 10 - +10 3.5 -
99 Silk Garden - 56 - - 3.5 -
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