Official NHA Assessment

Race 6: BOOK FOR GUINEAS DAY 1 FEBRUARY MR 80 HANDICAP (Open)

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Line Horse
Quatermain
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
6 / 11
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    On Target            3    56.0    1    0.00     6.0   84    58           84    +0
2    Quatermain           2    60.5    2    2.30     0.0   81    81           81    +0
3    Greenhouse           3    54.0    3    2.40     6.0   80    56           70    -10
4    Guy Alexander        3    56.0    4    3.40     6.0   72    59           62    -10
5    Supreme Dance        4    58.5    5    3.60     3.0   82    70           72    -10
6    Luthuli              5    60.5    6    4.60     0.0   81    79           79    -2
7    Eiger Sanction       3    61.0    7    5.90     6.0   83    68           73    -10
8    Circle Of Grace      4    55.0    8    8.60     3.0   74    62           64    -10
99   One More Star        3    57.0    99   0.00     6.0   -     60           60    +0
99   Kudzu                2    60.5    99   0.00     0.0   -     79           79    +0
99   Professor Snape      2    59.5    99   0.00     0.0   -     77           77    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 On Target 84 95 84 +11 6.0 -
2 Quatermain Line 81 79 81 -2 0.0
3 Greenhouse 80 73 70 +3 6.0 -
4 Guy Alexander 72 72 62 +10 6.0 -
5 Supreme Dance 82 76 72 +4 3.0 -
6 Luthuli 81 74 79 -5 0.0 -
7 Eiger Sanction 83 79 73 +6 6.0 -
8 Circle Of Grace 74 51 64 -13 3.0 -
99 One More Star - 87 60 +27 6.0 -
99 Kudzu - 80 79 +1 0.0 -
99 Professor Snape - 68 77 -9 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