Official NHA Assessment

Race 1: 4RACING WELCOMES YOU MAIDEN PLATE (For all Maidens. R15 000 Win bonus ROA Members)

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Line Horse
Busstopinhounslow
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
1 / 10
Within 2 points
Significant Diffs
8 / 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    Busstopinhounslow    3    59.0    1    0.00     7.5   83    83           83    +0
2    Kwagga Blitz         2    59.0    2    0.75     5.0   79    88           88    +9
3    Chieftain's Shield   4    60.0    3    4.00     9.0   69    82           82    +13
4    Lets Play Poker      3    60.0    4    4.60     7.5   74    85           85    +11
5    Sky On Fire          4    60.0    5    7.10     9.0   57    82           82    +25
5    Dwight Eisenhower    2    56.5    5    7.10     5.0   82    83           83    +1
7    Duchess Of Seville   4    57.5    7    7.80     9.0   67    77           77    +10
8    Peak Predator        4    60.0    8    12.80    9.0   61    82           82    +21
9    Chicago Lass         6    57.5    9    13.00    0.0   55    95           95    +40
99   Sommersilber         4    60.0    99   0.00     9.0   -     82           82    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Busstopinhounslow Line 83 110 83 +27 7.5
2 Kwagga Blitz 79 79 88 -9 5.0 -
3 Chieftain's Shield 69 80 82 -2 9.0 -
4 Lets Play Poker 74 78 85 -7 7.5 -
5 Sky On Fire 57 60 82 -22 9.0 -
5 Dwight Eisenhower 82 80 83 -3 5.0 -
7 Duchess Of Seville 67 53 77 -24 9.0 -
8 Peak Predator 61 57 82 -25 9.0 -
9 Chicago Lass 55 43 95 -52 0.0 -
99 Sommersilber - 56 82 -26 9.0 -
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