Official NHA Assessment

Race 7: BETWAY JOBURG SPRING CHALLENGE (Grade 2) (For all horses at Weight for age + Penalties)

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Line Horse
Choisaanada
Reference for assessment
Exact Matches
0 / 14
Calculated = Official
Close Matches
1 / 14
Within 2 points
Significant Diffs
10 / 14
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    Tin Pan Alley        2    50.0    1    0.00     0.0   113   93           93    -20
2    Atticus Finch        5    60.0    2    0.70     0.0   121   118          118   -3
3    Busstopinhounslow    3    57.5    3    0.80     8.0   109   96           99    -10
4    Choisaanada          2    57.5    4    1.00     0.0   112   112          112   +0
5    Nyaka Nyaka          2    50.0    5    3.10     0.0   97    95           95    -2
6    Texas Red            5    58.0    6    3.50     0.0   120   110          110   -10
7    Slinky Mapimpi       5    58.0    7    4.25     0.0   100   110          110   +10
8    Lucky Lad            4    58.0    8    4.75     5.0   124   99           114   -10
9    Thunee Playa         4    58.0    9    5.00     5.0   103   99           99    -4
10   Musical Score        3    57.5    10   6.25     8.0   112   92           102   -10
11   Quantum Theory       5    58.0    11   8.75     0.0   113   109          109   -4
12   Tommy Shelby         2    50.0    12   11.75    0.0   97    93           93    -4
13   Greeting My Master   2    58.0    13   14.15    0.0   110   109          109   -1
14   Royal Force          3    57.5    14   16.90    8.0   104   92           94    -10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tin Pan Alley 113 128 93 +35 0.0 -
2 Atticus Finch 121 127 118 +9 0.0 -
3 Busstopinhounslow 109 110 99 +11 8.0 -
4 Choisaanada Line 112 121 112 +9 0.0
5 Nyaka Nyaka 97 101 95 +6 0.0 -
6 Texas Red 120 119 110 +9 0.0 -
7 Slinky Mapimpi 100 101 110 -9 0.0 -
8 Lucky Lad 124 118 114 +4 5.0 -
9 Thunee Playa 103 107 99 +8 5.0 -
10 Musical Score 112 107 102 +5 8.0 -
11 Quantum Theory 113 112 109 +3 0.0 -
12 Tommy Shelby 97 101 93 +8 0.0 -
13 Greeting My Master 110 110 109 +1 0.0 -
14 Royal Force 104 104 94 +10 8.0 -
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