Official NHA Assessment

Race 5: WWW.TAB4RACING.COM MR 66 HANDICAP (Open)

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Line Horse
Oyster King
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
0 / 10
Within 2 points
Significant Diffs
6 / 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    English Primrose     3    54.5    1    0.00     4.0   54    44           54    +0
2    Big City Girl        4    52.0    2    0.40     2.0   53    48           48    -5
3    Oyster King          5    60.0    3    1.50     0.0   66    66           66    +0
4    Barmaid              2    57.5    4    4.00     0.0   69    59           59    -10
5    Parker Getrix        4    56.0    5    4.50     2.0   58    51           51    -7
6    Tara Iti             4    55.0    6    17.00    2.0   56    49           49    -7
99   What Say You         2    1.0     99   0.00     0.0   -     -55          -55   +0
99   Gimme The Flame      5    58.5    99   0.00     0.0   -     60           60    +0
99   Wondering Star       3    1.5     99   0.00     4.0   -     -62          -62   +0
99   Timeforthat          4    57.5    99   0.00     2.0   -     54           54    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 English Primrose 54 58 54 +4 4.0 -
2 Big City Girl 53 59 48 +11 2.0 -
3 Oyster King Line 66 50 66 -16 0.0
4 Barmaid 69 55 59 -4 0.0 -
5 Parker Getrix 58 56 51 +5 2.0 -
6 Tara Iti 56 52 49 +3 2.0 -
99 What Say You - 72 -55 +127 0.0 -
99 Gimme The Flame - 50 60 -10 0.0 -
99 Wondering Star - 67 -62 +129 4.0 -
99 Timeforthat - 60 54 +6 2.0 -
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