Official NHA Assessment

Race 3: CELEBRATING CENTURION MEMBER MARSH SHIRTLIFF'S BIRTHDAY MAIDEN PLATE (For all Maidens)

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Line Horse
Iko Iko
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
1 / 10
Within 2 points
Significant Diffs
7 / 10
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    Three Tigers         2    57.0    1    0.00     1.5   -     72           6     +6
2    Iko Iko              2    60.0    2    2.50     1.5   78    78           78    +0
3    Red Wave             2    57.0    3    2.90     1.5   -     72           72    +72
4    African Memoir       3    60.0    4    3.10     2.5   -     76           76    +76
5    Mount Augustus       2    57.0    5    6.10     1.5   -     72           72    +72
6    Bird On A Wing       3    58.0    6    7.60     2.5   65    72           72    +7
7    Blue Steel           2    57.0    7    7.80     1.5   -     72           72    +72
8    Bitter Sweet         3    57.5    8    8.30     2.5   50    71           71    +21
9    Aya's Dream          2    57.0    9    16.80    1.5   -     72           72    +72
10   Sandhurst            2    57.0    10   21.30    1.5   -     72           72    +72
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Three Tigers - 96 6 +90 1.5 -
2 Iko Iko Line 78 76 78 -2 1.5
3 Red Wave - 76 72 +4 1.5 -
4 African Memoir - 68 76 -8 2.5 -
5 Mount Augustus - 82 72 +10 1.5 -
6 Bird On A Wing 65 57 72 -15 2.5 -
7 Blue Steel - 82 72 +10 1.5 -
8 Bitter Sweet 50 53 71 -18 2.5 -
9 Aya's Dream - 67 72 -5 1.5 -
10 Sandhurst - - 72 -72 1.5 -
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