Official NHA Assessment

Race 4: MIDDLE STAKES (For horses with nett rating of 92 and below)

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Line Horse
Emerald Floe
Reference for assessment
Exact Matches
0 / 4
Calculated = Official
Close Matches
0 / 4
Within 2 points
Significant Diffs
3 / 4
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    Emerald Floe         4    51.5    1    0.00     5.0   77    77           77    +0
2    Oden                 6    56.0    2    1.00     0.0   75    96           96    +21
3    Armstrong            6    60.0    3    1.75     0.0   90    104          104   +14
4    Magnus Maximus       4    52.0    4    7.75     5.0   78    78           78    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Emerald Floe Line 77 82 77 +5 5.0
2 Oden 75 88 96 -8 0.0 -
3 Armstrong 90 89 104 -15 0.0 -
4 Magnus Maximus 78 71 78 -7 5.0 -
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