Official NHA Assessment

Race 8: TAB 4RACING APP MR 84 HANDICAP (Open)

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Line Horse
Rafa Bay
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
6 / 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    Vanakkam             2    59.0    1    0.00     3.5   89    90           89    +0
2    Rafa Bay             2    58.5    2    1.25     3.5   89    89           89    +0
3    Kwagga Blitz         2    58.0    3    1.35     3.5   80    88           88    +8
4    Caroline Island      2    58.5    4    3.15     3.5   88    89           89    +1
5    Halberdier           4    59.0    5    3.45     6.0   82    85           85    +3
6    Kia Kaha             3    53.5    6    3.70     5.0   76    76           76    +0
7    Plus Four            2    60.5    7    3.75     3.5   88    93           93    +5
8    Xenophon             3    59.5    8    4.75     5.0   83    88           88    +5
9    Dontshootthebarman   5    64.5    9    6.25     0.0   93    108          108   +15
10   Sergeant Soqrat      2    55.0    10   7.50     3.5   81    82           82    +1
99   Rock Of Bismantova   3    58.5    99   0.00     5.0   -     86           86    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Vanakkam 89 93 89 +4 3.5 -
2 Rafa Bay Line 89 96 89 +7 3.5
3 Kwagga Blitz 80 79 88 -9 3.5 -
4 Caroline Island 88 88 89 -1 3.5 -
5 Halberdier 82 83 85 -2 6.0 -
6 Kia Kaha 76 71 76 -5 5.0 -
7 Plus Four 88 87 93 -6 3.5 -
8 Xenophon 83 83 88 -5 5.0 -
9 Dontshootthebarman 93 93 108 -15 0.0 -
10 Sergeant Soqrat 81 71 82 -11 3.5 -
99 Rock Of Bismantova - 80 86 -6 5.0 -
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