Official NHA Assessment

Race 4: RACEHORSE OWNERS ASSOCIATION MAIDEN PLATE (For all Maidens. R15 000 Win bonus ROA Members)

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Line Horse
Spy Story
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
8 / 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    Spy Story            3    60.0    1    0.00     4.0   75    75           75    +0
2    Apache Chief         4    60.0    2    0.80     2.0   71    83           83    +12
3    Huehuetenango        3    60.0    3    1.10     4.0   -     79           79    +79
4    Snow Moon            3    60.0    4    1.20     4.0   75    79           79    +4
5    Chieftain's Shield   4    60.0    5    1.70     2.0   68    82           82    +14
6    Spirito Selvaggio    2    60.0    6    4.20     0.0   77    84           84    +7
7    Tibbott Bourke       4    60.0    7    4.80     2.0   66    79           79    +13
8    Peak Predator        4    60.0    8    5.10     2.0   61    79           79    +18
9    Brigham              3    60.0    9    6.35     4.0   -     75           75    +75
10   Lord Of The North    3    58.5    10   12.60    4.0   -     72           72    +72
11   Sovereign Crown      3    60.0    11   14.40    4.0   70    75           75    +5
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Spy Story Line 75 66 75 -9 4.0
2 Apache Chief 71 74 83 -9 2.0 -
3 Huehuetenango - 84 79 +5 4.0 -
4 Snow Moon 75 68 79 -11 4.0 -
5 Chieftain's Shield 68 80 82 -2 2.0 -
6 Spirito Selvaggio 77 77 84 -7 0.0 -
7 Tibbott Bourke 66 51 79 -28 2.0 -
8 Peak Predator 61 57 79 -22 2.0 -
9 Brigham - 74 75 -1 4.0 -
10 Lord Of The North - 48 72 -24 4.0 -
11 Sovereign Crown 70 68 75 -7 4.0 -
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