Official NHA Assessment

Race 5: CLASSIC DAY 2 MARCH MAIDEN PLATE (F & M) (For Maiden F&M. R15 000 Win bonus ROA Members)

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Line Horse
Darling Harbour
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
0 / 7
Within 2 points
Significant Diffs
6 / 7
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    Donna Mo             2    60.0    1    0.00     0.0   77    75           75    -2
2    Volare E Mambo       4    60.0    2    2.25     2.5   -     73           73    +73
3    Darling Harbour      4    60.0    3    4.25     2.5   71    71           71    +0
4    Arctic Vixen         2    60.0    4    13.50    0.0   72    75           75    +3
5    City Lights          4    60.0    5    23.25    2.5   69    70           70    +1
6    Hartenbos            2    60.0    6    99.99    0.0   -     75           75    +75
99   Dynamic Lass         6    60.0    99   0.00     0.0   -     75           75    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Donna Mo 77 89 75 +14 0.0 -
2 Volare E Mambo - 76 73 +3 2.5 -
3 Darling Harbour Line 71 60 71 -11 2.5
4 Arctic Vixen 72 66 75 -9 0.0 -
5 City Lights 69 52 70 -18 2.5 -
6 Hartenbos - 47 75 -28 0.0 -
99 Dynamic Lass - 67 75 -8 0.0 -
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