Official NHA Assessment

Race 6: BETWAY JOBURG SPRING CHALLENGE (Grade 2) (For all horses at Weight for age + Penalties)

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Line Horse
Thunderstruck
Reference for assessment
Exact Matches
0 / 16
Calculated = Official
Close Matches
1 / 16
Within 2 points
Significant Diffs
12 / 16
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    Main Defender        4    50.5    1    0.00     5.0   113   93           93    -20
2    Thunderstruck        2    58.0    2    6.50     0.0   118   118          118   +0
3    Ready To Charge      2    50.5    3    8.50     0.0   105   103          103   -2
4    William Robertson    6    59.5    4    9.50     0.0   121   121          121   +0
5    Anfields Rocket      5    60.0    5    9.90     0.0   120   122          122   +2
6    Bingwa               7    59.5    6    11.15    0.0   120   121          121   +1
7    Dave The King        2    58.0    7    13.25    0.0   126   118          118   -8
8    Miss Daisy           2    55.5    8    13.55    0.0   108   113          113   +5
9    Cabinet Shuffle      4    58.5    9    14.35    5.0   106   109          109   +3
10   Mk's Pride           4    58.5    10   14.75    5.0   120   109          110   -10
11   Quantum Theory       5    58.0    11   15.00    0.0   114   118          118   +4
12   Unzen                3    58.0    12   17.50    8.0   106   102          102   -4
13   Solar Power          3    58.5    13   21.75    8.0   98    103          103   +5
14   Forever Mine         4    58.5    14   26.50    5.0   109   109          109   +0
99   Star Coin            5    58.0    99   0.00     0.0   -     118          118   +0
99   Val d'Orcia          3    58.5    99   0.00     8.0   -     103          103   +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Main Defender 113 130 93 +37 5.0 -
2 Thunderstruck Line 118 128 118 +10 0.0
3 Ready To Charge 105 110 103 +7 0.0 -
4 William Robertson 121 124 121 +3 0.0 -
5 Anfields Rocket 120 106 122 -16 0.0 -
6 Bingwa 120 107 121 -14 0.0 -
7 Dave The King 126 128 118 +10 0.0 -
8 Miss Daisy 108 108 113 -5 0.0 -
9 Cabinet Shuffle 106 76 109 -33 5.0 -
10 Mk's Pride 120 116 110 +6 5.0 -
11 Quantum Theory 114 112 118 -6 0.0 -
12 Unzen 106 116 102 +14 8.0 -
13 Solar Power 98 88 103 -15 8.0 -
14 Forever Mine 109 105 109 -4 5.0 -
99 Star Coin - 78 118 -40 0.0 -
99 Val d'Orcia - 105 103 +2 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