Official NHA Assessment

Race 6: TAB 4RACING APP MAIDEN PLATE (For all Maidens)

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Line Horse
Twilight Bay
Reference for assessment
Exact Matches
1 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
9 / 11
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    Heemstede            3    60.0    1    0.00     2.5   75    74           74    -1
2    Twilight Bay         2    56.5    2    6.50     0.0   72    72           72    +0
3    Henry's Hedge        3    60.0    3    11.00    2.5   72    74           74    +2
4    Hat Montera          3    56.5    4    12.25    2.5   62    67           67    +5
5    Donny's Boy          3    60.0    5    15.50    2.5   65    74           74    +9
6    Cliffie Clavin       3    60.0    6    16.75    2.5   70    74           74    +4
7    Pardon Me            5    60.0    7    27.25    0.0   50    79           79    +29
8    Whatthebutlersaw     3    60.0    8    32.00    2.5   -     74           74    +74
9    War Lover            3    60.0    9    40.75    2.5   55    74           74    +19
10   Pyro Prince          3    60.0    10   44.25    2.5   50    74           74    +24
11   Lord Quinn           4    60.0    11   99.99    1.0   59    77           77    +18
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Heemstede 75 89 74 +15 2.5 -
2 Twilight Bay Line 72 72 72 ✓ Match 0.0
3 Henry's Hedge 72 75 74 +1 2.5 -
4 Hat Montera 62 81 67 +14 2.5 -
5 Donny's Boy 65 68 74 -6 2.5 -
6 Cliffie Clavin 70 57 74 -17 2.5 -
7 Pardon Me 50 53 79 -26 0.0 -
8 Whatthebutlersaw - 52 74 -22 2.5 -
9 War Lover 55 55 74 -19 2.5 -
10 Pyro Prince 50 50 74 -24 2.5 -
11 Lord Quinn 59 54 77 -23 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