Official NHA Assessment

Race 7: BETWAY SPRING SPREE STAKES (Listed) (Open)

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Line Horse
Night Bomber
Reference for assessment
Exact Matches
2 / 9
Calculated = Official
Close Matches
4 / 9
Within 2 points
Significant Diffs
3 / 9
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    Quantum Theory       5    60.5    1    0.00     0.0   111   135          117   +6
2    Kamensky             3    57.0    2    0.50     10.5  104   107          107   +3
3    Night Bomber         4    53.0    3    1.00     12.0  96    96           96    +0
4    Slinky Mapimpi       5    55.0    4    2.50     0.0   100   124          124   +24
5    Chyavana             3    58.5    5    5.10     10.5  107   110          110   +3
6    Cosmic Star          3    56.5    6    6.10     10.5  103   106          106   +3
7    Red Bomber           2    56.5    7    7.80     7.0   103   113          113   +10
8    Lead The Charge      2    54.5    8    9.30     7.0   99    109          109   +10
99   Espinoza             3    52.0    99   0.00     10.5  -     97           97    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Quantum Theory 111 112 117 -5 0.0 -
2 Kamensky 104 105 107 -2 10.5 -
3 Night Bomber Line 96 96 96 ✓ Match 12.0
4 Slinky Mapimpi 100 101 124 -23 0.0 -
5 Chyavana 107 106 110 -4 10.5 -
6 Cosmic Star 103 105 106 -1 10.5 -
7 Red Bomber 103 86 113 -27 7.0 -
8 Lead The Charge 99 89 109 -20 7.0 -
99 Espinoza - 97 97 ✓ Match 10.5 -
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