Official NHA Assessment

Race 5: FOR HOSPITALITY BOOKINGS CALL 011 681 1796 MIDDLE STAKES (For horses with nett rating of 101 and below)

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Line Horse
Arlington Action
Reference for assessment
Exact Matches
3 / 14
Calculated = Official
Close Matches
5 / 14
Within 2 points
Significant Diffs
5 / 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    Afraad               8    54.5    1    0.00     0.0   79    82           82    +3
2    Leeson               3    52.5    2    2.25     5.0   75    72           72    -3
3    Jet Dynasty          3    55.0    3    2.45     5.0   86    77           77    -9
4    Namaqua Blossom      3    50.0    4    2.70     5.0   76    67           67    -9
5    Arlington Action     6    51.5    5    4.45     0.0   77    77           77    +0
6    Banha Bridge         5    56.5    6    4.70     0.0   82    87           87    +5
7    Professor Snape      2    58.5    7    4.90     0.0   87    90           90    +3
8    Opera Glass          4    56.0    8    7.90     2.0   86    81           81    -5
9    United Council       5    60.0    9    8.40     0.0   95    93           93    -2
10   Reny                 2    60.0    10   11.15    0.0   96    93           93    -3
11   Slinky Mapimpi       5    58.5    11   12.65    0.0   88    90           90    +2
99   Twenty Drachma's     4    56.5    99   0.00     2.0   -     82           82    +0
99   Positive Attitude    6    58.5    99   0.00     0.0   -     90           90    +0
99   Mambo Come Tesio     3    56.5    99   0.00     5.0   -     76           76    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Afraad 79 79 82 -3 0.0 -
2 Leeson 75 72 72 ✓ Match 5.0 -
3 Jet Dynasty 86 82 77 +5 5.0 -
4 Namaqua Blossom 76 75 67 +8 5.0 -
5 Arlington Action Line 77 73 77 -4 0.0
6 Banha Bridge 82 70 87 -17 0.0 -
7 Professor Snape 87 68 90 -22 0.0 -
8 Opera Glass 86 81 81 ✓ Match 2.0 -
9 United Council 95 100 93 +7 0.0 -
10 Reny 96 91 93 -2 0.0 -
11 Slinky Mapimpi 88 101 90 +11 0.0 -
99 Twenty Drachma's - 83 82 +1 2.0 -
99 Positive Attitude - 90 90 ✓ Match 0.0 -
99 Mambo Come Tesio - 80 76 +4 5.0 -
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