Official NHA Assessment

Race 8: GUINEAS DAY 5 FEBRUARY MR 96 HANDICAP (Open)

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Line Horse
Ivalo's Prince
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
2 / 9
Within 2 points
Significant Diffs
6 / 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    Goodtime Guy         4    58.0    1    0.00     2.5   92    84           92    +0
2    Irish Tractor        4    57.5    2    0.75     2.5   91    87           87    -4
3    Ivalo's Prince       5    53.0    3    1.50     0.0   82    82           82    +0
4    Kayla's Champ        5    59.0    4    2.20     0.0   94    94           94    +0
5    Theory Of Flight     4    60.0    5    3.90     2.5   96    89           89    -7
6    Say When             4    54.5    6    4.30     2.5   85    77           77    -8
7    Grappler             4    56.5    7    5.10     2.5   89    81           81    -8
8    Captain Hindsight    5    60.0    8    5.30     0.0   96    93           93    -3
9    Ballon D'or          5    55.5    9    7.60     0.0   87    84           84    -3
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Goodtime Guy 92 96 92 +4 2.5 -
2 Irish Tractor 91 102 87 +15 2.5 -
3 Ivalo's Prince Line 82 62 82 -20 0.0
4 Kayla's Champ 94 77 94 -17 0.0 -
5 Theory Of Flight 96 91 89 +2 2.5 -
6 Say When 85 84 77 +7 2.5 -
7 Grappler 89 79 81 -2 2.5 -
8 Captain Hindsight 96 112 93 +19 0.0 -
9 Ballon D'or 87 61 84 -23 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