Official NHA Assessment

Race 9: NEXT VAAL RACEMEETING TUESDAY 28 NOVEMBER MR 75 HANDICAP (Open)

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Line Horse
Written In Stone
Reference for assessment
Exact Matches
0 / 15
Calculated = Official
Close Matches
4 / 15
Within 2 points
Significant Diffs
9 / 15
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    Whirlybird           2    57.5    1    0.00     5.0   83    57           83    +0
2    After Hours          7    59.5    2    1.00     0.0   74    71           71    -3
3    Jet Cat              9    53.0    3    1.75     0.0   61    58           58    -3
4    Ampersand            2    60.0    4    3.00     5.0   88    62           78    -10
5    Written In Stone     9    52.0    5    3.50     0.0   56    56           56    +0
6    Mescal               2    60.5    6    3.90     5.0   76    63           66    -10
7    Pendragon            5    60.0    7    4.00     0.0   75    72           72    -3
8    Duke Of Rock         3    58.5    8    4.20     7.5   72    54           62    -10
9    Halberdier           4    60.5    9    4.40     9.0   86    55           76    -10
10   Lulu's Boy           5    60.0    10   5.00     0.0   75    72           72    -3
11   Lang's Power         2    52.0    11   6.00     5.0   57    46           47    -10
12   Johnny Dogs          2    57.5    12   7.50     5.0   70    57           60    -10
13   Circle Of Grace      4    56.0    13   9.25     9.0   77    46           67    -10
14   Kill Shot            2    56.0    14   9.50     5.0   75    54           65    -10
99   Here With Me         2    58.0    99   0.00     5.0   -     58           58    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Whirlybird 83 73 83 -10 5.0 -
2 After Hours 74 79 71 +8 0.0 -
3 Jet Cat 61 60 58 +2 0.0 -
4 Ampersand 88 83 78 +5 5.0 -
5 Written In Stone Line 56 67 56 +11 0.0
6 Mescal 76 64 66 -2 5.0 -
7 Pendragon 75 73 72 +1 0.0 -
8 Duke Of Rock 72 76 62 +14 7.5 -
9 Halberdier 86 83 76 +7 9.0 -
10 Lulu's Boy 75 71 72 -1 0.0 -
11 Lang's Power 57 52 47 +5 5.0 -
12 Johnny Dogs 70 67 60 +7 5.0 -
13 Circle Of Grace 77 51 67 -16 9.0 -
14 Kill Shot 75 54 65 -11 5.0 -
99 Here With Me - 77 58 +19 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