Official NHA Assessment

Race 7: GUINEAS DAY 5 FEBRUARY WORK RIDERS MAIDEN PLATE (For all Maidens)

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Line Horse
Viceroy
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
6 / 8
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    Rule Book            6    58.0    1    0.00     0.0   -     53           6     +6
2    Harold The Duke      3    58.0    2    2.00     6.0   47    46           46    -1
3    Viceroy              4    60.0    3    3.00     3.0   54    54           54    +0
4    Royal Tiger          5    60.0    4    15.25    0.0   52    57           57    +5
5    Fort Alado           5    60.0    5    16.75    0.0   54    57           57    +3
6    Royal Siege          5    60.0    6    18.00    0.0   50    57           57    +7
7    Apache Gold          3    58.0    7    21.50    6.0   66    41           56    -10
8    Broadway             4    60.0    8    27.50    3.0   58    51           51    -7
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Rule Book - 92 6 +86 0.0 -
2 Harold The Duke 47 86 46 +40 6.0 -
3 Viceroy Line 54 55 54 +1 3.0
4 Royal Tiger 52 44 57 -13 0.0 -
5 Fort Alado 54 48 57 -9 0.0 -
6 Royal Siege 50 44 57 -13 0.0 -
7 Apache Gold 66 52 56 -4 6.0 -
8 Broadway 58 59 51 +8 3.0 -
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