Official NHA Assessment

Race 6: WWW.RACINGTODAY.CO.ZA MR 66 HANDICAP (Open)

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Line Horse
Viva De Janeiro
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
0 / 10
Within 2 points
Significant Diffs
7 / 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    Unsolved Riddle      3    61.5    1    0.00     2.0   69    61           69    +0
2    Viva De Janeiro      5    57.5    2    1.00     0.0   61    61           61    +0
3    Silent Trigger       6    59.5    3    2.75     0.0   65    63           63    -2
4    Northern Kitten      3    55.0    4    5.75     2.0   56    48           48    -8
5    Sneak Preview        3    60.5    5    6.45     2.0   67    59           59    -8
6    Circle Of Grace      4    60.5    6    7.20     0.5   67    62           62    -5
7    After Hours          7    61.5    7    8.40     0.0   69    65           65    -4
8    Sail The Sky         4    62.0    8    8.65     0.5   70    65           65    -5
9    Arctic Vixen         2    56.0    9    12.05    0.0   66    54           56    -10
99   Perini Palace        4    54.5    99   0.00     0.5   -     50           50    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Unsolved Riddle 69 77 69 +8 2.0 -
2 Viva De Janeiro Line 61 50 61 -11 0.0
3 Silent Trigger 65 60 63 -3 0.0 -
4 Northern Kitten 56 67 48 +19 2.0 -
5 Sneak Preview 67 63 59 +4 2.0 -
6 Circle Of Grace 67 51 62 -11 0.5 -
7 After Hours 69 79 65 +14 0.0 -
8 Sail The Sky 70 62 65 -3 0.5 -
9 Arctic Vixen 66 66 56 +10 0.0 -
99 Perini Palace - 56 50 +6 0.5 -
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