Official NHA Assessment

Race 4: WWW.TAB.CO.ZA OPEN MAIDEN (For Maidens)

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Line Horse
Dutchess D'Orange
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
7 / 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    Global Reef          3    59.5    1    0.00     3.5   65    59           59    -6
2    Heemstede            3    60.0    2    0.25     3.5   73    60           63    -10
3    Dutchess D'Orange    2    52.0    3    2.00     0.0   56    56           56    +0
4    Lightningfork        3    60.0    4    3.25     3.5   73    63           63    -10
5    Hat Montera          3    53.5    5    3.35     3.5   65    50           55    -10
6    Prolific Star        3    57.0    6    3.85     3.5   67    56           57    -10
7    Take A Mulligan      4    53.5    7    9.10     1.5   52    51           51    -1
8    Cheap Thrills        4    52.5    8    10.35    1.5   51    49           49    -2
9    Welsh Starlet        3    52.5    9    14.10    3.5   58    45           48    -10
10   Top Dollar           5    53.5    10   33.60    0.0   47    54           54    +7
99   Lord Quinn           4    56.5    99   0.00     1.5   -     57           57    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Global Reef 65 68 59 +9 3.5 -
2 Heemstede 73 89 63 +26 3.5 -
3 Dutchess D'Orange Line 56 52 56 -4 0.0
4 Lightningfork 73 62 63 -1 3.5 -
5 Hat Montera 65 81 55 +26 3.5 -
6 Prolific Star 67 64 57 +7 3.5 -
7 Take A Mulligan 52 50 51 -1 1.5 -
8 Cheap Thrills 51 56 49 +7 1.5 -
9 Welsh Starlet 58 63 48 +15 3.5 -
10 Top Dollar 47 42 54 -12 0.0 -
99 Lord Quinn - 54 57 -3 1.5 -
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