Official NHA Assessment

Race 3: GAUTENG GUINEAS DAY 4 FEBRUARY MAIDEN PLATE (For all Maidens. R15 000 Win bonus ROA Members)

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Line Horse
Fast Duty
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
0 / 11
Within 2 points
Significant Diffs
11 / 11
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    Slinky Mapimpi       5    60.0    1    0.00     0.0   83    77           70    -13
2    Fast Duty            3    60.0    2    1.00     4.0   73    73           73    +0
3    Efficient Trader     2    57.0    3    2.00     0.0   65    74           74    +9
4    Air Fusion           3    60.0    4    6.50     4.0   -     69           69    +69
5    Williamson           2    60.0    5    7.75     0.0   -     77           77    +77
6    Cash Slip            2    60.0    6    9.75     0.0   71    77           77    +6
7    Moon Valley          4    58.5    7    10.75    2.0   38    70           70    +32
8    Grace De Silver      3    60.0    8    11.00    4.0   -     69           69    +69
99   Broadway             4    60.0    99   0.00     2.0   -     73           73    +0
99   Chateau Futura       2    57.0    99   0.00     0.0   -     71           71    +0
99   Count Your Chances   5    57.0    99   0.00     0.0   -     71           71    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Slinky Mapimpi 83 101 70 +31 0.0 -
2 Fast Duty Line 73 67 73 -6 4.0
3 Efficient Trader 65 57 74 -17 0.0 -
4 Air Fusion - 55 69 -14 4.0 -
5 Williamson - 62 77 -15 0.0 -
6 Cash Slip 71 58 77 -19 0.0 -
7 Moon Valley 38 48 70 -22 2.0 -
8 Grace De Silver - - 69 -69 4.0 -
99 Broadway - 59 73 -14 2.0 -
99 Chateau Futura - 59 71 -12 0.0 -
99 Count Your Chances - 51 71 -20 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