Official NHA Assessment

Race 6: GREYVILLE CONVENTION CENTRE FM 66 HANDICAP (F & M) (For Fillies and Mares)

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Line Horse
Sleek As Silk
Reference for assessment
Exact Matches
1 / 12
Calculated = Official
Close Matches
1 / 12
Within 2 points
Significant Diffs
8 / 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    Zinikele             5    59.5    1    0.00     0.0   77    75           77    +0
2    Sleek As Silk        2    56.0    2    2.40     0.0   70    70           70    +0
3    Royal Kitty          5    59.0    3    3.30     0.0   64    75           75    +11
4    Venturous            3    61.0    4    4.40     6.0   68    66           66    -2
5    Maid In France       4    57.0    5    4.80     3.5   60    63           63    +3
6    Birdwatcher          5    57.0    6    5.05     0.0   60    70           70    +10
7    Top Honours          4    53.0    7    6.55     3.5   52    55           55    +3
8    Casa Rosada          4    52.0    8    7.05     3.5   58    53           53    -5
9    Lollapalooza         3    59.0    9    7.25     6.0   69    62           62    -7
10   Leopard Lady         4    55.0    10   7.35     3.5   56    59           59    +3
11   Spirit Of Dacha      4    56.0    11   14.35    3.5   58    61           61    +3
12   Umhlali              2    58.0    12   23.15    0.0   77    72           72    -5
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Zinikele 77 89 77 +12 0.0 -
2 Sleek As Silk Line 70 87 70 +17 0.0
3 Royal Kitty 64 66 75 -9 0.0 -
4 Venturous 68 66 66 ✓ Match 6.0 -
5 Maid In France 60 57 63 -6 3.5 -
6 Birdwatcher 60 53 70 -17 0.0 -
7 Top Honours 52 45 55 -10 3.5 -
8 Casa Rosada 58 57 53 +4 3.5 -
9 Lollapalooza 69 74 62 +12 6.0 -
10 Leopard Lady 56 55 59 -4 3.5 -
11 Spirit Of Dacha 58 53 61 -8 3.5 -
12 Umhlali 77 67 72 -5 0.0 -
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