Official NHA Assessment

Race 9: NEXT TURFFONTEIN RACEMEETING THURSDAY 10 NOVEMBER MAIDEN PLATE (3 year-olds) (For Maiden 3 year-olds)

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Line Horse
Stella Et Clavis
Reference for assessment
Exact Matches
0 / 12
Calculated = Official
Close Matches
2 / 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    Sylvan Theater       3    60.0    1    0.00     6.0   77    57           57    -20
2    Sharapova            5    57.0    2    1.25     0.0   -     67           67    +67
3    Billy Spellbound     2    60.0    3    1.75     0.0   -     72           72    +72
4    Stella Et Clavis     2    60.0    4    2.50     0.0   71    71           71    +0
5    Wonderworld          2    60.0    5    6.00     0.0   -     69           69    +69
6    Midnight Crystal     2    57.0    6    6.50     0.0   71    63           63    -8
7    Puerto Plata (ARG)   3    60.0    7    7.25     6.0   -     57           57    +57
8    Mon Choisy           3    60.0    8    8.75     6.0   -     57           57    +57
9    Queen Britanna       2    57.0    9    9.25     0.0   60    63           63    +3
10   Sword Of Mercy       3    60.0    10   16.00    6.0   -     57           57    +57
99   Rosslyne             2    55.5    99   0.00     0.0   -     60           60    +0
99   Black Egret          3    60.0    99   0.00     6.0   -     57           57    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Sylvan Theater 77 73 57 +16 6.0 -
2 Sharapova - 80 67 +13 0.0 -
3 Billy Spellbound - 73 72 +1 0.0 -
4 Stella Et Clavis Line 71 64 71 -7 0.0
5 Wonderworld - 64 69 -5 0.0 -
6 Midnight Crystal 71 66 63 +3 0.0 -
7 Puerto Plata (ARG) - 68 57 +11 6.0 -
8 Mon Choisy - - 57 -57 6.0 -
9 Queen Britanna 60 57 63 -6 0.0 -
10 Sword Of Mercy - 65 57 +8 6.0 -
99 Rosslyne - 58 60 -2 0.0 -
99 Black Egret - 90 57 +33 6.0 -
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