Official NHA Assessment

Race 9: NEXT VAAL RACEMEETING SATURDAY 10 DECEMBER MR 80 HANDICAP (Open)

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Line Horse
Duke Of Rain
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
1 / 10
Within 2 points
Significant Diffs
7 / 10
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    Eye Of The Prophet   2    55.5    1    0.00     0.0   86    79           86    +0
2    Southern Blaze       3    55.5    2    0.25     6.0   71    67           67    -4
3    Billy Spellbound     2    53.0    3    0.75     0.0   78    78           78    +0
4    Duke Of Rain         3    56.0    4    1.25     6.0   72    72           72    +0
5    Mcebisi              4    55.5    5    1.75     3.0   71    76           76    +5
6    Twin Turbo           4    58.0    6    2.00     3.0   76    81           81    +5
7    Indus Knight         3    58.5    7    3.25     6.0   77    75           75    -2
8    Foreign Field        4    58.0    8    3.75     3.0   76    79           79    +3
9    Definitely Maybe     3    60.0    9    6.00     6.0   80    76           76    -4
10   Brenden James        6    57.0    10   8.00     0.0   74    82           82    +8
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Eye Of The Prophet 86 108 86 +22 0.0 -
2 Southern Blaze 71 89 67 +22 6.0 -
3 Billy Spellbound 78 73 78 -5 0.0 -
4 Duke Of Rain Line 72 70 72 -2 6.0
5 Mcebisi 71 70 76 -6 3.0 -
6 Twin Turbo 76 88 81 +7 3.0 -
7 Indus Knight 77 70 75 -5 6.0 -
8 Foreign Field 76 73 79 -6 3.0 -
9 Definitely Maybe 80 97 76 +21 6.0 -
10 Brenden James 74 98 82 +16 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