Official NHA Assessment

Race 1: BP CHATSWORTH MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Blowin In The Wind
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
0 / 11
Within 2 points
Significant Diffs
10 / 11
More than 5 points
Detailed Assessment
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Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
------------------------------------------------------------------------------------------------------------------------
1    Hot Lava             3    59.0    1    0.00     8.5   79    76           76    -3
2    Blowin In The Wind   3    59.0    2    0.80     8.5   76    76           76    +0
3    Princess Goldie      3    59.0    3    1.85     8.5   -     76           76    +76
4    Greenlight Queen     3    59.0    4    3.55     8.5   -     76           76    +76
5    Are You Sure         2    59.0    5    3.85     5.5   -     82           82    +82
6    Fantasy League       3    59.0    6    5.45     8.5   -     76           76    +76
7    Seattle Rain         3    59.0    7    8.15     8.5   -     76           76    +76
8    Silver Quill         3    56.5    8    10.25    8.5   -     71           71    +71
9    Roy's Grace          4    60.0    9    10.85    10.0  -     75           75    +75
10   Isiphithiphithi      3    59.0    10   13.35    8.5   -     76           76    +76
11   Musical Chord        3    59.0    11   14.85    8.5   -     76           76    +76
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Hot Lava 79 69 76 -7 8.5 -
2 Blowin In The Wind Line 76 63 76 -13 8.5
3 Princess Goldie - 73 76 -3 8.5 -
4 Greenlight Queen - 64 76 -12 8.5 -
5 Are You Sure - 64 82 -18 5.5 -
6 Fantasy League - 54 76 -22 8.5 -
7 Seattle Rain - 55 76 -21 8.5 -
8 Silver Quill - - 71 -71 8.5 -
9 Roy's Grace - 63 75 -12 10.0 -
10 Isiphithiphithi - - 76 -76 8.5 -
11 Musical Chord - - 76 -76 8.5 -
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