Official NHA Assessment

Race 4: 4RACING.TV MR 86 HANDICAP (Open)

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Line Horse
Atkinson Grimshaw
Reference for assessment
Exact Matches
1 / 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    Definitely Maybe     3    59.5    1    0.00     10.0  85    73           85    +0
2    Irish Rain           4    54.5    2    0.50     7.0   74    76           76    +2
3    Atkinson Grimshaw    4    55.0    3    1.25     7.0   76    76           76    +0
4    Waiting For Summer   3    57.0    4    2.50     10.0  80    72           72    -8
5    Zig Zag              5    61.0    5    4.50     0.0   88    97           97    +9
6    Heartsease           3    55.0    6    8.25     10.0  76    64           66    -10
7    You Know Who         3    61.0    7    9.50     10.0  88    76           78    -10
8    Double Destiny       2    58.5    8    17.50    0.0   85    91           91    +6
99   Mister Monocle       4    55.5    99   0.00     7.0   -     71           71    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Definitely Maybe 85 97 85 +12 10.0 -
2 Irish Rain 74 71 76 -5 7.0 -
3 Atkinson Grimshaw Line 76 75 76 -1 7.0
4 Waiting For Summer 80 79 72 +7 10.0 -
5 Zig Zag 88 87 97 -10 0.0 -
6 Heartsease 76 73 66 +7 10.0 -
7 You Know Who 88 91 78 +13 10.0 -
8 Double Destiny 85 77 91 -14 0.0 -
99 Mister Monocle - 71 71 ✓ Match 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