Official NHA Assessment

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

Back to Race
Line Horse
Spy Story
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
------------------------------------------------------------------------------------------------------------------------
Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
------------------------------------------------------------------------------------------------------------------------
1    Under The Rainbow    3    60.0    1    0.00     7.0   54    80           60    +6
2    Khichdi              3    56.5    2    1.60     7.0   -     76           76    +76
3    Gift Of Royal        3    58.0    3    3.20     7.0   66    78           78    +12
4    Spy Story            3    58.0    4    4.50     7.0   76    76           76    +0
5    Devilishlygorgeous   4    57.0    5    4.90     4.0   63    80           80    +17
6    Prairie Spring       3    55.0    6    12.90    7.0   -     70           70    +70
7    Beverly Baby         3    55.0    7    13.90    7.0   51    70           70    +19
8    Kivuli               3    56.0    8    15.40    7.0   -     72           72    +72
9    Mist In Ireland      3    55.0    9    16.25    7.0   -     70           70    +70
99   Scarlet              3    57.0    99   0.00     7.0   -     74           74    +0
------------------------------------------------------------------------------------------------------------------------

Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Under The Rainbow 54 64 60 +4 7.0 -
2 Khichdi - 62 76 -14 7.0 -
3 Gift Of Royal 66 58 78 -20 7.0 -
4 Spy Story Line 76 66 76 -10 7.0
5 Devilishlygorgeous 63 64 80 -16 4.0 -
6 Prairie Spring - - 70 -70 7.0 -
7 Beverly Baby 51 53 70 -17 7.0 -
8 Kivuli - 41 72 -31 7.0 -
9 Mist In Ireland - 72 70 +2 7.0 -
99 Scarlet - 47 74 -27 7.0 -
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