Official NHA Assessment

Race 6: ZIMBABWE CHALLENGE (Open)

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Line Horse
Action Zone
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
3 / 7
Within 2 points
Significant Diffs
4 / 7
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    Tom's Diner          4    56.0    1    0.00     2.5   90    93           93    +3
2    Guerra               4    54.0    2    0.75     2.5   86    93           93    +7
3    Action Zone          3    56.0    3    0.85     5.0   92    92           92    +0
4    Jaeger Moon          7    58.0    4    1.85     0.0   97    105          105   +8
5    Jet Mirage           3    60.0    5    2.10     5.0   100   99           99    -1
6    Ideal View           6    56.0    6    3.10     0.0   91    100          100   +9
7    The Octagon          2    50.0    7    3.60     0.0   77    87           87    +10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tom's Diner 90 94 93 +1 2.5 -
2 Guerra 86 86 93 -7 2.5 -
3 Action Zone Line 92 90 92 -2 5.0
4 Jaeger Moon 97 97 105 -8 0.0 -
5 Jet Mirage 100 100 99 +1 5.0 -
6 Ideal View 91 90 100 -10 0.0 -
7 The Octagon 77 76 87 -11 0.0 -
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