Official NHA Assessment

Race 5: BOOK FOR CLASSIC DAY 1 MARCH MAIDEN PLATE (For all Maidens. R15 000 Win bonus ROA Members)

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Line Horse
Prolific Star
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
6 / 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    Page Boy             3    60.0    1    0.00     4.0   66    67           67    +1
2    Chieftain's Shield   4    60.0    2    6.00     2.0   66    71           71    +5
3    Sovereign Crown      3    60.0    3    6.50     4.0   70    67           67    -3
4    Prolific Star        3    60.0    4    7.00     4.0   67    67           67    +0
5    Brigham              3    60.0    5    8.00     4.0   68    67           67    -1
6    Mystic Vision        3    60.0    6    18.25    4.0   74    67           67    -7
7    Kissing Master       3    60.0    7    18.50    4.0   -     67           67    +67
8    Knight's Fire        3    60.0    8    20.75    4.0   60    67           67    +7
9    Eratosthenes         3    60.0    9    32.00    4.0   -     67           67    +67
10   Ragamuffin           2    60.0    10   99.99    0.0   46    75           75    +29
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Page Boy 66 79 67 +12 4.0 -
2 Chieftain's Shield 66 80 71 +9 2.0 -
3 Sovereign Crown 70 68 67 +1 4.0 -
4 Prolific Star Line 67 64 67 -3 4.0
5 Brigham 68 74 67 +7 4.0 -
6 Mystic Vision 74 66 67 -1 4.0 -
7 Kissing Master - 39 67 -28 4.0 -
8 Knight's Fire 60 60 67 -7 4.0 -
9 Eratosthenes - 63 67 -4 4.0 -
10 Ragamuffin 46 45 75 -30 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