Official NHA Assessment

Race 8: OK GRAND CHALLENGE (Grade 1) (Open/6th leg Open Series)

Back to Race
Line Horse
Only Him
Reference for assessment
Exact Matches
1 / 16
Calculated = Official
Close Matches
5 / 16
Within 2 points
Significant Diffs
6 / 16
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------
Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
------------------------------------------------------------------------------------------------------------------------
1    Down To Business     2    54.5    1    0.00     0.0   92    87           87    -5
2    Holy Land            6    58.5    2    0.10     0.0   96    95           95    -1
3    Only Him             4    60.0    3    1.35     1.0   99    99           99    +0
4    Tulip Way            5    52.0    4    1.45     0.0   83    85           85    +2
5    Lily Blue            5    56.0    5    2.20     0.0   91    93           93    +2
6    Ideal View           6    55.0    6    2.25     0.0   89    91           91    +2
7    Jacky Sparrow        3    52.0    7    2.50     2.0   82    80           80    -2
8    Raining Again        6    55.5    8    4.00     0.0   90    90           90    +0
9    Zavannahgold         2    52.0    9    4.10     0.0   81    83           83    +2
10   Wantage              8    58.5    10   5.60     0.0   96    95           95    -1
11   Jubilee              7    53.5    11   7.35     0.0   86    85           85    -1
12   True Beauty          4    60.0    12   7.60     1.0   99    96           96    -3
13   Mr Greenlight        6    60.0    13   7.85     0.0   99    98           98    -1
14   Varnica              5    56.5    14   13.85    0.0   92    91           91    -1
99   Dindingwe            4    57.0    99   0.00     1.0   -     90           90    +0
99   Mind Master          4    54.0    99   0.00     1.0   -     84           84    +0
------------------------------------------------------------------------------------------------------------------------

Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Down To Business 92 100 87 +13 0.0 -
2 Holy Land 96 97 95 +2 0.0 -
3 Only Him Line 99 87 99 -12 1.0
4 Tulip Way 83 80 85 -5 0.0 -
5 Lily Blue 91 86 93 -7 0.0 -
6 Ideal View 89 90 91 -1 0.0 -
7 Jacky Sparrow 82 80 80 ✓ Match 2.0 -
8 Raining Again 90 73 90 -17 0.0 -
9 Zavannahgold 81 78 83 -5 0.0 -
10 Wantage 96 78 95 -17 0.0 -
11 Jubilee 86 72 85 -13 0.0 -
12 True Beauty 99 99 96 +3 1.0 -
13 Mr Greenlight 99 97 98 -1 0.0 -
14 Varnica 92 90 91 -1 0.0 -
99 Dindingwe - 95 90 +5 1.0 -
99 Mind Master - 87 84 +3 1.0 -
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