Official NHA Assessment

Race 6: JONSSON WORKWEAR COMPUTAFORM SPRINT (Grade 1) (For all horses at Weight for Age)

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Line Horse
William Robertson
Reference for assessment
Exact Matches
0 / 12
Calculated = Official
Close Matches
3 / 12
Within 2 points
Significant Diffs
9 / 12
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    Isivunguvungu        3    60.0    1    0.00     3.0   119   119          119   +0
2    William Robertson    6    60.0    2    2.00     0.0   125   125          125   +0
3    Princess Calla       4    57.5    3    2.05     3.5   127   113          117   -10
4    Sheela               3    57.5    4    4.00     3.0   117   114          114   -3
5    Big Burn             3    57.5    5    4.30     3.0   115   114          114   -1
6    Taikonaut            2    58.0    6    4.75     2.0   111   117          117   +6
7    Bartholdi            4    60.0    7    7.00     3.5   119   118          118   -1
8    Danilo Danilovitch   3    60.0    8    10.00    3.0   103   119          119   +16
9    Gobsmacked           2    55.5    9    11.75    2.0   113   112          112   -1
10   Karangetang          2    58.0    10   13.00    2.0   110   117          117   +7
99   Master Archie        3    60.0    99   0.00     3.0   -     119          119   +0
99   Rollwiththepunches   6    60.0    99   0.00     0.0   -     125          125   +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Isivunguvungu 119 130 119 +11 3.0 -
2 William Robertson Line 125 124 125 -1 0.0
3 Princess Calla 127 127 117 +10 3.5 -
4 Sheela 117 121 114 +7 3.0 -
5 Big Burn 115 115 114 +1 3.0 -
6 Taikonaut 111 104 117 -13 2.0 -
7 Bartholdi 119 117 118 -1 3.5 -
8 Danilo Danilovitch 103 89 119 -30 3.0 -
9 Gobsmacked 113 106 112 -6 2.0 -
10 Karangetang 110 95 117 -22 2.0 -
99 Master Archie - 128 119 +9 3.0 -
99 Rollwiththepunches - 90 125 -35 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