Official NHA Assessment

Race 1: WELCOME TO NELSON MANDELA BAY RACING MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Bold Leah
Reference for assessment
Exact Matches
0 / 12
Calculated = Official
Close Matches
4 / 12
Within 2 points
Significant Diffs
6 / 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    Royal Welcome        3    60.0    1    0.00     3.5   55    54           54    -1
2    Ladonna Mia          3    60.0    2    1.25     3.5   63    54           54    -9
3    Gailiea              3    58.5    3    1.75     3.5   43    51           51    +8
4    Bold Leah            4    60.0    4    2.00     4.0   53    53           53    +0
5    Social Spirit        3    60.0    5    4.25     3.5   58    54           54    -4
6    Magic To The Fore    3    60.0    6    4.30     3.5   63    54           54    -9
7    Twice The Secret     3    60.0    7    6.30     3.5   59    54           54    -5
8    Mezzyoona            4    60.0    8    6.55     4.0   39    53           53    +14
9    Helencanucope        3    60.0    9    7.80     3.5   54    54           54    +0
10   Rare                 3    60.0    10   14.30    3.5   60    54           54    -6
11   Jaytara              3    60.0    11   14.35    3.5   -     54           54    +54
12   Temple Bar           3    60.0    12   18.10    3.5   62    54           54    -8
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Royal Welcome 55 53 54 -1 3.5 -
2 Ladonna Mia 63 59 54 +5 3.5 -
3 Gailiea 43 50 51 -1 3.5 -
4 Bold Leah Line 53 40 53 -13 4.0
5 Social Spirit 58 52 54 -2 3.5 -
6 Magic To The Fore 63 58 54 +4 3.5 -
7 Twice The Secret 59 60 54 +6 3.5 -
8 Mezzyoona 39 39 53 -14 4.0 -
9 Helencanucope 54 45 54 -9 3.5 -
10 Rare 60 53 54 -1 3.5 -
11 Jaytara - 47 54 -7 3.5 -
12 Temple Bar 62 60 54 +6 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