Official NHA Assessment

Race 8: NEXT FAIRVIEW RACEMEETING FRIDAY 19 SEPTEMBER MR 76 HANDICAP (Open)

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Line Horse
Big Boy Bruce
Reference for assessment
Exact Matches
2 / 11
Calculated = Official
Close Matches
3 / 11
Within 2 points
Significant Diffs
7 / 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    Tintamarre           3    62.0    1    0.00     9.5   80    74           80    +0
2    Notorix              6    55.5    2    1.25     0.0   67    80           80    +13
3    Big Boy Bruce        2    60.5    3    1.75     6.5   77    77           77    +0
4    Swiss Walt           4    57.5    4    1.85     11.0  76    62           66    -10
5    Cruzador             6    54.0    5    2.10     0.0   64    77           77    +13
6    Russian Empire       5    52.0    6    4.10     0.0   55    73           73    +18
7    Silver Tycoon        7    60.0    7    4.35     0.0   76    89           89    +13
8    Mighty Mac           5    52.5    8    6.35     0.0   61    74           74    +13
9    Green Okra           2    57.0    9    9.10     6.5   70    70           70    +0
10   Montana Lights       2    61.0    10   11.85    6.5   78    78           78    +0
11   Chief Runner         3    52.5    11   12.10    9.5   69    55           59    -10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tintamarre 80 88 80 +8 9.5 -
2 Notorix 67 68 80 -12 0.0 -
3 Big Boy Bruce Line 77 76 77 -1 6.5
4 Swiss Walt 76 74 66 +8 11.0 -
5 Cruzador 64 61 77 -16 0.0 -
6 Russian Empire 55 53 73 -20 0.0 -
7 Silver Tycoon 76 74 89 -15 0.0 -
8 Mighty Mac 61 52 74 -22 0.0 -
9 Green Okra 70 66 70 -4 6.5 -
10 Montana Lights 78 78 78 ✓ Match 6.5 -
11 Chief Runner 69 59 59 ✓ Match 9.5 -
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