Official NHA Assessment

Race 8: TAB SA DERBY (Grade 1) (3 year olds (3rd Leg SA Triple Crown))

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Line Horse
Pure Predator
Reference for assessment
Exact Matches
0 / 13
Calculated = Official
Close Matches
3 / 13
Within 2 points
Significant Diffs
7 / 13
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    Purple Pitcher       4    60.0    1    0.00     2.0   120   112          112   -8
2    Pure Predator        2    60.0    2    0.25     0.0   116   116          116   +0
3    Mondial              3    60.0    3    0.40     5.5   105   111          111   +6
4    Hotarubi             4    60.0    4    2.50     2.0   116   116          116   +0
5    Taxhaven             4    60.0    5    3.00     2.0   78    115          115   +37
6    Marauding Horde      4    60.0    6    3.50     2.0   96    114          114   +18
7    Viva Brazil          3    60.0    7    3.60     5.5   94    107          107   +13
8    Shoot The Rapids     4    60.0    8    4.25     2.0   89    114          114   +25
9    Presley              4    60.0    9    6.75     2.0   98    112          112   +14
10   Atarime              3    60.0    10   7.75     5.5   83    105          105   +22
11   Twenty Drachma's     4    60.0    11   9.15     2.0   92    112          112   +20
12   Thunee Playa         4    60.0    12   9.25     2.0   80    112          112   +32
13   George Handel        4    60.0    13   36.25    2.0   93    112          112   +19
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Purple Pitcher 120 121 112 +9 2.0 -
2 Pure Predator Line 116 118 116 +2 0.0
3 Mondial 105 115 111 +4 5.5 -
4 Hotarubi 116 98 116 -18 2.0 -
5 Taxhaven 78 96 115 -19 2.0 -
6 Marauding Horde 96 112 114 -2 2.0 -
7 Viva Brazil 94 94 107 -13 5.5 -
8 Shoot The Rapids 89 117 114 +3 2.0 -
9 Presley 98 90 112 -22 2.0 -
10 Atarime 83 103 105 -2 5.5 -
11 Twenty Drachma's 92 83 112 -29 2.0 -
12 Thunee Playa 80 107 112 -5 2.0 -
13 George Handel 93 85 112 -27 2.0 -
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