Official NHA Assessment

Race 4: FOR HOSPITALITY BOOKINGS CALL 011 681 1796 MIDDLE STAKES (For horses with nett rating of 105 and below)

Back to Race
Line Horse
Birthright
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
7 / 10
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------
Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
------------------------------------------------------------------------------------------------------------------------
1    Tamarisk Tree        5    56.0    1    0.00     0.0   92    94           94    +2
2    Whafeef              6    58.0    2    0.90     0.0   94    104          104   +10
3    Birthright           4    52.0    3    1.50     3.0   85    85           85    +0
4    King's Express       3    56.0    4    3.75     6.0   90    84           84    -6
5    Quatermain           2    52.0    5    4.85     0.0   83    86           86    +3
6    Twenty Drachma's     4    54.0    6    6.35     3.0   90    84           84    -6
7    Home Of The Brave    2    58.5    7    6.75     0.0   101   99           99    -2
8    Hawkbill             4    56.0    8    7.05     3.0   94    88           88    -6
9    Rule Book            6    58.0    9    12.25    0.0   96    98           98    +2
99   Vesuvio              5    54.0    99   0.00     0.0   -     90           90    +0
------------------------------------------------------------------------------------------------------------------------

Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tamarisk Tree 92 105 94 +11 0.0 -
2 Whafeef 94 91 104 -13 0.0 -
3 Birthright Line 85 95 85 +10 3.0
4 King's Express 90 102 84 +18 6.0 -
5 Quatermain 83 79 86 -7 0.0 -
6 Twenty Drachma's 90 83 84 -1 3.0 -
7 Home Of The Brave 101 97 99 -2 0.0 -
8 Hawkbill 94 100 88 +12 3.0 -
9 Rule Book 96 92 98 -6 0.0 -
99 Vesuvio - 85 90 -5 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