Official NHA Assessment

Race 6: CLASSIC DAY 7 MARCH MIDDLE STAKES (For All Horses)

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Line Horse
Dark Silver
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
6 / 10
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    Open Highway         4    54.0    1    0.00     1.5   88    92           92    +4
2    The Playboy Bomber   4    54.0    2    2.00     1.5   88    95           95    +7
3    Dark Silver          4    49.5    3    2.50     1.5   85    85           85    +0
4    Birthright           4    58.0    4    3.70     1.5   95    101          101   +6
5    Bob's Your Uncle     5    60.0    5    4.50     0.0   100   107          107   +7
6    Hotarubi             4    60.0    6    4.75     1.5   100   104          104   +4
7    Tommy Shelby         2    54.0    7    6.55     0.0   101   95           95    -6
8    Master Christmas     4    58.0    8    6.75     1.5   95    100          100   +5
9    The Africa House     4    58.0    9    9.25     1.5   94    100          100   +6
10   Taxhaven             4    58.0    10   11.50    1.5   96    100          100   +4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Open Highway 88 94 92 +2 1.5 -
2 The Playboy Bomber 88 88 95 -7 1.5 -
3 Dark Silver Line 85 84 85 -1 1.5
4 Birthright 95 95 101 -6 1.5 -
5 Bob's Your Uncle 100 103 107 -4 0.0 -
6 Hotarubi 100 98 104 -6 1.5 -
7 Tommy Shelby 101 101 95 +6 0.0 -
8 Master Christmas 95 94 100 -6 1.5 -
9 The Africa House 94 93 100 -7 1.5 -
10 Taxhaven 96 96 100 -4 1.5 -
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