Official NHA Assessment

Race 1: 4RACING WELCOMES YOU WORK RIDERS MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Empress Wu
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
3 / 9
Within 2 points
Significant Diffs
4 / 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    Varachino's Champ    3    60.0    1    0.00     5.0   73    63           63    -10
2    El Zani              3    60.0    2    2.60     5.0   -     63           63    +63
3    Empress Wu           3    60.0    3    3.30     5.0   63    63           63    +0
4    Wispinthewillow      3    60.0    4    5.70     5.0   -     63           63    +63
5    Power Of Tiger       3    60.0    5    6.00     5.0   68    63           63    -5
6    Amaze Me             2    60.0    6    6.70     3.5   69    66           66    -3
7    Hurricane Power      2    60.0    7    6.75     3.5   64    66           66    +2
8    Seven Times Red      3    60.0    8    7.35     5.0   -     63           63    +63
9    Speedwell Queen      5    60.0    9    16.75    0.0   -     73           73    +73
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Varachino's Champ 73 75 63 +12 5.0 -
2 El Zani - 82 63 +19 5.0 -
3 Empress Wu Line 63 61 63 -2 5.0
4 Wispinthewillow - 71 63 +8 5.0 -
5 Power Of Tiger 68 61 63 -2 5.0 -
6 Amaze Me 69 64 66 -2 3.5 -
7 Hurricane Power 64 63 66 -3 3.5 -
8 Seven Times Red - 59 63 -4 5.0 -
9 Speedwell Queen - - 73 -73 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