Official NHA Assessment

Race 7: GREYVILLE CONVENTION CENTRE MR 70 HANDICAP (Open)

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Line Horse
Brass Bell
Reference for assessment
Exact Matches
0 / 12
Calculated = Official
Close Matches
5 / 12
Within 2 points
Significant Diffs
2 / 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    Rafiki               2    57.5    1    0.00     0.0   65    62           65    +0
2    Sweeper Keeper       4    60.5    2    0.05     6.0   72    56           62    -10
3    Bom Bom              4    61.0    3    0.45     6.0   73    62           63    -10
4    Mister Nibbles       3    59.5    4    1.45     8.5   86    52           76    -10
5    Brass Bell           8    53.5    5    1.95     0.0   57    57           57    +0
6    Stevie Gee           5    55.5    6    2.45     0.0   61    60           60    -1
7    Copper John          4    61.0    7    2.65     6.0   73    59           63    -10
8    Nightjar             3    60.5    8    3.45     8.5   72    52           62    -10
9    Lake Como            3    58.0    9    4.65     8.5   66    46           56    -10
10   Drogarati            4    48.0    10   4.70     6.0   52    31           42    -10
99   Pongola              5    59.0    99   0.00     0.0   -     65           65    +0
99   Forest Jump          8    54.5    99   0.00     0.0   -     56           56    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Rafiki 65 67 65 +2 0.0 -
2 Sweeper Keeper 72 67 62 +5 6.0 -
3 Bom Bom 73 64 63 +1 6.0 -
4 Mister Nibbles 86 81 76 +5 8.5 -
5 Brass Bell Line 57 55 57 -2 0.0
6 Stevie Gee 61 65 60 +5 0.0 -
7 Copper John 73 61 63 -2 6.0 -
8 Nightjar 72 67 62 +5 8.5 -
9 Lake Como 66 61 56 +5 8.5 -
10 Drogarati 52 52 42 +10 6.0 -
99 Pongola - 66 65 +1 0.0 -
99 Forest Jump - 62 56 +6 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