Official NHA Assessment

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

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Line Horse
Zinovi
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
7 / 11
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    Back In Business     3    53.0    1    0.00     10.5  96    89           89    -7
2    Cliff Hanger         2    58.0    2    1.80     7.0   106   106          106   +0
3    Zinovi               2    62.0    3    4.00     7.0   114   114          114   +0
4    Silent War           3    56.5    4    4.75     10.5  103   96           96    -7
5    Guy Gibson           2    57.5    5    5.00     7.0   105   105          105   +0
6    Quantum Theory       5    61.0    6    6.10     0.0   112   126          126   +14
7    Halberdier           4    52.0    7    6.70     12.0  89    84           84    -5
8    Chyavana             3    55.0    8    7.80     10.5  100   93           93    -7
9    Ready To Charge      2    59.0    9    9.00     7.0   108   108          108   +0
10   Fire 'N Flames       4    54.0    10   9.25     12.0  98    88           88    -10
11   Thunderstone         2    52.0    11   13.25    7.0   92    94           94    +2
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Back In Business 96 114 89 +25 10.5 -
2 Cliff Hanger 106 111 106 +5 7.0 -
3 Zinovi Line 114 120 114 +6 7.0
4 Silent War 103 91 96 -5 10.5 -
5 Guy Gibson 105 99 105 -6 7.0 -
6 Quantum Theory 112 112 126 -14 0.0 -
7 Halberdier 89 83 84 -1 12.0 -
8 Chyavana 100 106 93 +13 10.5 -
9 Ready To Charge 108 110 108 +2 7.0 -
10 Fire 'N Flames 98 103 88 +15 12.0 -
11 Thunderstone 92 86 94 -8 7.0 -
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