Official NHA Assessment

Race 6: East Coast Radio TIBOUCHINA STAKES (Grade 2) (Fillies and Mares at Weight For Age + Penalties)

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Line Horse
Marigold Hotel
Reference for assessment
Exact Matches
1 / 12
Calculated = Official
Close Matches
3 / 12
Within 2 points
Significant Diffs
7 / 12
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    Humdinger            3    60.0    1    0.00     1.0   108   110          110   +2
2    Marigold Hotel       3    58.5    2    0.20     1.0   107   107          107   +0
3    Tipsy Tarragon       2    57.0    3    0.95     0.0   109   110          110   +1
4    Miss Cool            2    58.5    4    2.05     0.0   102   112          112   +10
5    Mrs Browning         5    57.0    5    2.10     0.0   97    109          109   +12
6    Bon Vivant           3    58.5    6    2.35     1.0   112   109          109   -3
7    Macara               4    58.5    7    3.15     0.5   97    110          110   +13
8    Shantastic           2    57.0    8    4.55     0.0   101   106          106   +5
9    Maharanee            2    58.5    9    4.95     0.0   112   109          109   -3
10   Going Up             3    58.5    10   8.25     1.0   107   107          107   +0
11   Hollywoodbound       3    58.5    11   9.15     1.0   99    107          107   +8
12   Aisling              3    58.5    12   13.15    1.0   90    107          107   +17
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Humdinger 108 119 110 +9 1.0 -
2 Marigold Hotel Line 107 107 107 ✓ Match 1.0
3 Tipsy Tarragon 109 108 110 -2 0.0 -
4 Miss Cool 102 106 112 -6 0.0 -
5 Mrs Browning 97 115 109 +6 0.0 -
6 Bon Vivant 112 96 109 -13 1.0 -
7 Macara 97 101 110 -9 0.5 -
8 Shantastic 101 109 106 +3 0.0 -
9 Maharanee 112 110 109 +1 0.0 -
10 Going Up 107 110 107 +3 1.0 -
11 Hollywoodbound 99 101 107 -6 1.0 -
12 Aisling 90 66 107 -41 1.0 -
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