Official NHA Assessment

Race 1: WELCOME TO NELSON MANDELA BAY OPEN MAIDEN (F & M) (For all Maiden F&M. R15 000 Win bonus ROA Members)

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Line Horse
Opera Verse
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
4 / 10
Within 2 points
Significant Diffs
4 / 10
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    Tune Again           6    58.0    1    0.00     0.0   60    68           66    +6
2    Opera Verse          4    53.5    2    2.50     4.0   51    51           51    +0
3    Midwicket            3    59.5    3    3.25     3.5   68    64           64    -4
4    Ruby Claire          3    60.0    4    3.50     3.5   69    65           65    -4
5    Duchess Of Seville   4    60.0    5    5.00     4.0   64    64           64    +0
6    Trillion Dreams      5    52.0    6    7.00     0.0   43    56           56    +13
7    Cosmic Cliffs        3    59.5    7    8.50     3.5   68    64           64    -4
8    Summer Heat          3    51.5    8    14.00    3.5   50    48           48    -2
9    Oh Yoko              3    55.5    9    16.00    3.5   60    56           56    -4
99   Time In Paris        4    58.0    99   0.00     4.0   -     60           60    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tune Again 60 50 66 -16 0.0 -
2 Opera Verse Line 51 50 51 -1 4.0
3 Midwicket 68 67 64 +3 3.5 -
4 Ruby Claire 69 52 65 -13 3.5 -
5 Duchess Of Seville 64 53 64 -11 4.0 -
6 Trillion Dreams 43 45 56 -11 0.0 -
7 Cosmic Cliffs 68 67 64 +3 3.5 -
8 Summer Heat 50 47 48 -1 3.5 -
9 Oh Yoko 60 54 56 -2 3.5 -
99 Time In Paris - 61 60 +1 4.0 -
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