Official NHA Assessment

Race 8: WILGERBOSDRIFT H F OPPENHEIMER HORSE CHESTNUT STAKES (Grade 1) (Weight for Age)

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Line Horse
Cousin Casey
Reference for assessment
Exact Matches
0 / 14
Calculated = Official
Close Matches
3 / 14
Within 2 points
Significant Diffs
6 / 14
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    Main Defender        4    57.0    1    0.00     1.5   121   114          114   -7
2    Dave The King        2    60.0    2    2.75     0.0   122   125          125   +3
3    Princess Calla       4    57.5    3    4.75     1.5   127   115          117   -10
4    Cousin Casey         2    60.0    4    5.25     0.0   123   123          123   +0
5    Son Of Raj           5    60.0    5    5.50     0.0   115   123          123   +8
6    At My Command        2    60.0    6    8.50     0.0   126   123          123   -3
7    Puerto Manzano (ARG  4    60.0    7    14.75    1.5   125   120          120   -5
8    Sugar Mountain       3    60.0    8    20.25    3.0   115   117          117   +2
9    Safe Passage         3    60.0    9    20.50    3.0   116   117          117   +1
10   Melech               5    60.0    10   21.50    0.0   117   123          123   +6
11   Mk's Pride           4    60.0    11   22.50    1.5   116   120          120   +4
12   Back In Business     3    60.0    12   23.50    3.0   90    117          117   +27
13   Cosmic Highway       3    60.0    13   25.00    3.0   117   117          117   +0
99   Winchester Mansion   3    60.0    99   0.00     3.0   -     117          117   +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Main Defender 121 130 114 +16 1.5 -
2 Dave The King 122 128 125 +3 0.0 -
3 Princess Calla 127 127 117 +10 1.5 -
4 Cousin Casey Line 123 125 123 +2 0.0
5 Son Of Raj 115 116 123 -7 0.0 -
6 At My Command 126 116 123 -7 0.0 -
7 Puerto Manzano (ARG) 125 119 120 -1 1.5 -
8 Sugar Mountain 115 122 117 +5 3.0 -
9 Safe Passage 116 108 117 -9 3.0 -
10 Melech 117 118 123 -5 0.0 -
11 Mk's Pride 116 116 120 -4 1.5 -
12 Back In Business 90 114 117 -3 3.0 -
13 Cosmic Highway 117 115 117 -2 3.0 -
99 Winchester Mansion - 129 117 +12 3.0 -
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