Official NHA Assessment

Race 6: SA DERBY 4 APRIL MR 70 HANDICAP (Open)

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Line Horse
Unsolved Riddle
Reference for assessment
Exact Matches
0 / 14
Calculated = Official
Close Matches
0 / 14
Within 2 points
Significant Diffs
12 / 14
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    Diogenes             2    60.0    1    0.00     0.0   78    81           78    +0
2    Unsolved Riddle      3    57.5    2    0.40     4.0   73    73           73    +0
3    Itsnowornever        5    55.0    3    0.45     0.0   60    76           76    +16
4    Circle Of Grace      4    49.5    4    1.25     2.0   51    60           60    +9
5    Vava Vegas           5    55.0    5    3.25     0.0   60    73           73    +13
6    Golden Aspen         6    57.0    6    3.75     0.0   64    76           76    +12
7    Zoombomber           2    55.0    7    5.75     0.0   60    71           71    +11
8    Libeccio             5    56.5    8    6.50     0.0   63    74           74    +11
9    Pretty Analia        5    57.5    9    7.20     0.0   65    76           76    +11
10   Mattiazo             4    59.5    10   7.30     2.0   69    76           76    +7
11   Fifth Of July        5    58.0    11   7.50     0.0   66    77           77    +11
12   Concordia            2    55.5    12   24.25    0.0   69    72           72    +3
99   Celtic Rush          5    59.5    99   0.00     0.0   -     80           80    +0
99   Sail The Sky         4    56.0    99   0.00     2.0   -     69           69    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Diogenes 78 86 78 +8 0.0 -
2 Unsolved Riddle Line 73 77 73 +4 4.0
3 Itsnowornever 60 64 76 -12 0.0 -
4 Circle Of Grace 51 51 60 -9 2.0 -
5 Vava Vegas 60 58 73 -15 0.0 -
6 Golden Aspen 64 66 76 -10 0.0 -
7 Zoombomber 60 60 71 -11 0.0 -
8 Libeccio 63 62 74 -12 0.0 -
9 Pretty Analia 65 61 76 -15 0.0 -
10 Mattiazo 69 69 76 -7 2.0 -
11 Fifth Of July 66 63 77 -14 0.0 -
12 Concordia 69 69 72 -3 0.0 -
99 Celtic Rush - 69 80 -11 0.0 -
99 Sail The Sky - 62 69 -7 2.0 -
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