Official NHA Assessment

Race 6: BETWAY MR 81 DIVIDEND HANDICAP (Open)

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Line Horse
Royal Edition
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
0 / 8
Within 2 points
Significant Diffs
8 / 8
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    Willow Express       7    57.5    1    0.00     0.0   76    86           76    +0
2    Quatermain           2    59.5    2    0.75     0.0   80    94           94    +14
3    Royal Edition        4    60.0    3    2.00     6.0   82    82           82    +0
4    Black Lightning      2    55.0    4    7.00     0.0   71    81           81    +10
5    Circle Of Grace      4    57.0    5    16.50    6.0   76    73           73    -3
99   Gimmeachoice         3    58.5    99   0.00     8.5   -     71           71    +0
99   Chestnut Bomber      3    57.0    99   0.00     8.5   -     68           68    +0
99   Archimides           3    54.5    99   0.00     8.5   -     63           63    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Willow Express 76 82 76 +6 0.0 -
2 Quatermain 80 79 94 -15 0.0 -
3 Royal Edition Line 82 92 82 +10 6.0
4 Black Lightning 71 64 81 -17 0.0 -
5 Circle Of Grace 76 51 73 -22 6.0 -
99 Gimmeachoice - 87 71 +16 8.5 -
99 Chestnut Bomber - 90 68 +22 8.5 -
99 Archimides - 70 63 +7 8.5 -
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