Official NHA Assessment

Race 1: 4RACING WELCOMES YOU MAIDEN PLATE (For all Maidens)

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Line Horse
Royale Jacket
Reference for assessment
Exact Matches
1 / 12
Calculated = Official
Close Matches
3 / 12
Within 2 points
Significant Diffs
5 / 12
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    Master Spy           2    59.0    1    0.00     0.0   81    73           73    -8
2    Ubermensch           3    60.0    2    0.80     5.0   71    69           69    -2
3    Royale Jacket        2    59.0    3    4.40     0.0   73    73           73    +0
4    Emerald Forge        2    56.0    4    7.10     0.0   78    67           68    -10
5    Master Buddy         3    59.0    5    7.35     5.0   -     63           63    +63
6    Pompeii Shield       4    60.0    6    8.25     2.5   -     70           70    +70
7    Kambati              4    60.0    7    10.35    2.5   -     70           70    +70
8    Scott's Guard        2    59.0    8    26.35    0.0   63    73           73    +10
9    Russel Square        3    59.0    9    27.65    5.0   59    63           63    +4
10   Flower Road          3    55.0    10   27.90    5.0   -     55           55    +55
99   Gunboat              3    59.0    99   0.00     5.0   -     63           63    +0
99   Epidaurus            3    59.0    99   0.00     5.0   -     63           63    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Master Spy 81 88 73 +15 0.0 -
2 Ubermensch 71 74 69 +5 5.0 -
3 Royale Jacket Line 73 74 73 +1 0.0
4 Emerald Forge 78 72 68 +4 0.0 -
5 Master Buddy - 73 63 +10 5.0 -
6 Pompeii Shield - 69 70 -1 2.5 -
7 Kambati - 75 70 +5 2.5 -
8 Scott's Guard 63 63 73 -10 0.0 -
9 Russel Square 59 59 63 -4 5.0 -
10 Flower Road - - 55 -55 5.0 -
99 Gunboat - 74 63 +11 5.0 -
99 Epidaurus - 63 63 ✓ Match 5.0 -
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