Official NHA Assessment
Race 8: GUINEAS DAY 5 FEBRUARY MR 96 HANDICAP (Open)
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
------------------------------------------------------------------------------------------------------------------------ Pos Horse Age Weight Fin Lengths WFA Pre Race Rating New Adj ------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------
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:
- Identify Line Horse - consistent performer used as reference
- Calculate WFA Allowance based on age, distance, and month
- Apply Drag Adjustment for beaten margin
- Calculate Actual Weight Performance:
Weight - Drag - WFA - Compare to Line Horse to determine race rating
- 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