Official NHA Assessment

Race 1: MAIDEN PLATE (Maiden Plate Colts & Geldings to carry)

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Line Horse
Ginjamatinja
Reference for assessment
Exact Matches
1 / 6
Calculated = Official
Close Matches
1 / 6
Within 2 points
Significant Diffs
5 / 6
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    Karoo Winter         4    56.5    1    0.00     1.0   40    40           40    +0
2    Windsor Lane (ZIM)   4    56.5    2    4.00     1.0   30    41           41    +11
3    Bruce's Spirit       6    60.0    3    9.00     0.0   55    49           49    -6
4    Ginjamatinja         3    60.0    4    12.00    2.0   45    45           45    +0
5    Royal Obsession      3    60.0    5    16.00    2.0   -     45           45    +45
6    Apache Gold          3    60.0    6    24.00    2.0   53    45           45    -8
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Karoo Winter 40 56 40 +16 1.0 -
2 Windsor Lane (ZIM) 30 49 41 +8 1.0 -
3 Bruce's Spirit 55 55 49 +6 0.0 -
4 Ginjamatinja Line 45 45 45 ✓ Match 2.0
5 Royal Obsession - 37 45 -8 2.0 -
6 Apache Gold 53 52 45 +7 2.0 -
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