Official NHA Assessment

Race 2: J R VAN DER LINDEN MAIDEN PLATE (For all Maidens)

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Line Horse
Midnight Flyer
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
0 / 8
Within 2 points
Significant Diffs
7 / 8
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    Banyan               3    58.0    1    0.00     10.5  -     -            -     +0
2    Miami Mountain       3    58.0    2    1.30     10.5  -     -            -     +0
3    Midnight Flyer       3    58.0    3    2.30     10.5  -     -            -     +0
4    Arizona Magic        4    60.0    4    4.00     12.0  -     1            1     +1
5    Miss Munroe          2    57.5    5    4.75     7.0   72    6            62    -10
6    Single Combat        3    54.0    6    9.00     10.5  -     -8           -     +0
7    Empress Wu           3    57.5    7    10.50    10.5  66    -1           56    -10
8    Jet Querari          3    60.0    8    17.50    10.5  68    4            58    -10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Banyan - 83 - +83 10.5 -
2 Miami Mountain - 103 - +103 10.5 -
3 Midnight Flyer Line - 85 - +85 10.5
4 Arizona Magic - 66 1 +65 12.0 -
5 Miss Munroe 72 75 62 +13 7.0 -
6 Single Combat - 79 - +79 10.5 -
7 Empress Wu 66 61 56 +5 10.5 -
8 Jet Querari 68 68 58 +10 10.5 -
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