Official NHA Assessment

Race 9: BET WITH TAB CLASS 4 (Open. Benchmark at 60.0kg = 78)

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Line Horse
Bonanza
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
8 / 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    Night Tiger          5    58.5    1    0.00     0.0   78    80           80    +2
2    Bonanza              3    53.0    2    0.10     2.5   64    64           64    +0
3    Swift Action         3    56.5    3    0.15     2.5   71    71           71    +0
4    Dance Variety        2    61.0    4    0.35     1.5   83    82           82    -1
5    Lunch Money          3    59.5    5    0.55     2.5   80    77           77    -3
6    Kimball O'Hara       2    56.0    6    2.80     1.5   73    72           72    -1
7    Kelp Forest          5    58.0    7    4.30     0.0   77    79           79    +2
8    Mighty Mac           5    58.0    8    4.80     0.0   77    79           79    +2
9    Ntabazondi           3    55.0    9    9.55     2.5   67    68           68    +1
10   Superior Leader      4    53.0    10   11.80    0.0   64    69           69    +5
11   Bullitt              2    56.5    11   17.55    1.5   74    73           73    -1
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Night Tiger 78 67 80 -13 0.0 -
2 Bonanza Line 64 57 64 -7 2.5
3 Swift Action 71 77 71 +6 2.5 -
4 Dance Variety 83 114 82 +32 1.5 -
5 Lunch Money 80 70 77 -7 2.5 -
6 Kimball O'Hara 73 61 72 -11 1.5 -
7 Kelp Forest 77 81 79 +2 0.0 -
8 Mighty Mac 77 52 79 -27 0.0 -
9 Ntabazondi 67 70 68 +2 2.5 -
10 Superior Leader 64 64 69 -5 0.0 -
11 Bullitt 74 65 73 -8 1.5 -
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