Official NHA Assessment

Race 6: SWEET CHESTNUT STAKES (Listed) (For F&M 3-years & older (Leg 1 of the Winter Series))

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Line Horse
Kyalami Girl
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
5 / 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    Princess Izzy        2    60.0    1    0.00     0.0   91    91           91    +0
2    Enemy Territory (IR  3    60.0    2    1.50     2.0   98    90           90    -8
3    My Flower Fate       3    60.0    3    3.50     2.0   85    88           88    +3
4    Kyalami Girl         2    59.5    4    3.55     0.0   91    91           91    +0
5    Siddeley             2    60.0    5    3.60     0.0   95    92           92    -3
6    Montelena            4    60.0    6    6.10     1.0   93    89           89    -4
7    Lady Mistico         2    60.0    7    6.20     0.0   87    91           91    +4
8    Fun Zone             5    60.0    8    8.20     0.0   92    91           91    -1
9    Trip To Maputo       2    60.0    9    14.20    0.0   89    91           91    +2
99   Summer Lily          2    60.0    99   0.00     0.0   -     91           91    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Princess Izzy 91 104 91 +13 0.0 -
2 Enemy Territory (IRE) 98 99 90 +9 2.0 -
3 My Flower Fate 85 86 88 -2 2.0 -
4 Kyalami Girl Line 91 88 91 -3 0.0
5 Siddeley 95 105 92 +13 0.0 -
6 Montelena 93 90 89 +1 1.0 -
7 Lady Mistico 87 75 91 -16 0.0 -
8 Fun Zone 92 96 91 +5 0.0 -
9 Trip To Maputo 89 96 91 +5 0.0 -
99 Summer Lily - 99 91 +8 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