Official NHA Assessment

Race 1: MARSHALLS WORLD OF SPORT DARLEY ARABIAN (Listed) (Handicap)

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Line Horse
Donald McDonald
Reference for assessment
Exact Matches
0 / 15
Calculated = Official
Close Matches
2 / 15
Within 2 points
Significant Diffs
11 / 15
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    Silvano's Timer      4    56.0    1    0.00     0.5   98    92           98    +0
2    Donald McDonald      5    57.5    2    0.40     0.0   101   101          101   +0
3    Indlamu              4    56.5    3    3.70     0.5   99    94           94    -5
4    Bowie                7    56.0    4    4.80     0.0   98    93           93    -5
5    Gentleman's Wager    7    60.0    5    5.05     0.0   106   101          101   -5
6    Reunion              4    59.5    6    5.45     0.5   105   99           99    -6
7    Cat Daddy            6    59.5    7    5.50     0.0   105   100          100   -5
8    Savannah Storm       5    53.5    8    5.70     0.0   93    88           88    -5
9    Priceless Ruler      6    56.0    9    7.50     0.0   98    93           93    -5
10   Willow Express       7    58.5    10   8.50     0.0   103   98           98    -5
11   Look For Hounds      4    59.0    11   10.90    0.5   104   98           98    -6
12   Juliet Tango         6    55.0    12   31.00    0.0   98    91           91    -7
99   Arctic Drift         5    54.0    99   0.00     0.0   -     89           89    +0
99   Bush Tracker         6    53.0    99   0.00     0.0   -     87           87    +0
99   Back To Black        4    53.0    99   0.00     0.5   -     86           86    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Silvano's Timer 98 106 98 +8 0.5 -
2 Donald McDonald Line 101 107 101 +6 0.0
3 Indlamu 99 86 94 -8 0.5 -
4 Bowie 98 82 93 -11 0.0 -
5 Gentleman's Wager 106 106 101 +5 0.0 -
6 Reunion 105 100 99 +1 0.5 -
7 Cat Daddy 105 98 100 -2 0.0 -
8 Savannah Storm 93 102 88 +14 0.0 -
9 Priceless Ruler 98 99 93 +6 0.0 -
10 Willow Express 103 82 98 -16 0.0 -
11 Look For Hounds 104 104 98 +6 0.5 -
12 Juliet Tango 98 81 91 -10 0.0 -
99 Arctic Drift - 97 89 +8 0.0 -
99 Bush Tracker - 100 87 +13 0.0 -
99 Back To Black - 89 86 +3 0.5 -
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