Official NHA Assessment

Race 11: PRIME TREES MR 84 HANDICAP (Open)

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Line Horse
Night Ruler
Reference for assessment
Exact Matches
0 / 12
Calculated = Official
Close Matches
1 / 12
Within 2 points
Significant Diffs
9 / 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    Han Solo             5    59.5    1    0.00     0.0   83    97           83    +0
2    Solar Power          3    55.0    2    1.50     4.0   83    83           83    +0
3    Night Ruler          3    57.5    3    1.80     4.0   88    88           88    +0
4    Sun Dazed            6    55.5    4    1.90     0.0   84    92           92    +8
5    Surjay               3    57.0    5    2.10     4.0   87    87           87    +0
6    Tout A Fait          3    53.5    6    2.35     4.0   83    79           79    -4
7    You Know Who         3    57.5    7    3.60     4.0   88    86           86    -2
8    Poltergeist          3    53.0    8    3.80     4.0   79    77           77    -2
9    Path Of Choice       5    57.5    9    5.30     0.0   79    93           93    +14
10   Paper Trail          4    59.5    10   6.55     2.5   83    92           92    +9
11   Izapha               4    60.0    11   7.30     2.5   84    93           93    +9
12   Alingalonga          4    58.0    12   14.80    2.5   80    89           89    +9
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Han Solo 83 102 83 +19 0.0 -
2 Solar Power 83 88 83 +5 4.0 -
3 Night Ruler Line 88 75 88 -13 4.0
4 Sun Dazed 84 64 92 -28 0.0 -
5 Surjay 87 121 87 +34 4.0 -
6 Tout A Fait 83 80 79 +1 4.0 -
7 You Know Who 88 91 86 +5 4.0 -
8 Poltergeist 79 71 77 -6 4.0 -
9 Path Of Choice 79 68 93 -25 0.0 -
10 Paper Trail 83 60 92 -32 2.5 -
11 Izapha 84 74 93 -19 2.5 -
12 Alingalonga 80 82 89 -7 2.5 -
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