Official NHA Assessment

Race 4: 4RACING.TV MAIDEN PLATE (F & M) (For Maiden F & M. R15 000 Win bonus ROA Members)

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Line Horse
Spirit Princess
Reference for assessment
Exact Matches
0 / 12
Calculated = Official
Close Matches
4 / 12
Within 2 points
Significant Diffs
7 / 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    Spirit Princess      2    60.0    1    0.00     0.0   69    69           69    +0
2    Impersonation        3    60.0    2    1.75     2.5   64    67           67    +3
3    Antananarivo         4    60.0    3    3.50     1.0   64    68           68    +4
4    Turnthebeataround    3    60.0    4    3.55     2.5   73    65           65    -8
5    Idabelle             2    60.0    5    5.25     0.0   67    69           69    +2
6    Raining Rubies       5    60.0    6    6.50     0.0   59    69           69    +10
7    Dusky Rose           3    60.0    7    10.50    2.5   60    64           64    +4
8    Perform              2    60.0    8    10.75    0.0   61    69           69    +8
9    Aunt Pittypat        3    60.0    9    11.50    2.5   58    64           64    +6
10   Ideal Heart          3    60.0    10   12.75    2.5   60    64           64    +4
11   Lady Dynamo          3    60.0    11   12.80    2.5   -     64           64    +64
12   Coffee In Brazil     3    60.0    12   25.00    2.5   56    64           64    +8
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Spirit Princess Line 69 51 69 -18 0.0
2 Impersonation 64 68 67 +1 2.5 -
3 Antananarivo 64 57 68 -11 1.0 -
4 Turnthebeataround 73 64 65 -1 2.5 -
5 Idabelle 67 70 69 +1 0.0 -
6 Raining Rubies 59 75 69 +6 0.0 -
7 Dusky Rose 60 58 64 -6 2.5 -
8 Perform 61 54 69 -15 0.0 -
9 Aunt Pittypat 58 65 64 +1 2.5 -
10 Ideal Heart 60 54 64 -10 2.5 -
11 Lady Dynamo - 61 64 -3 2.5 -
12 Coffee In Brazil 56 49 64 -15 2.5 -
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