Official NHA Assessment

Race 6: GREYVILLE CONVENTION CENTRE MIDDLE STAKES (F & M) (For F&M with nett rating of 102 and below)

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Line Horse
Lock And Key
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    Ice Rain             4    57.0    1    0.00     0.5   87    91           91    +4
2    Lock And Key         2    58.5    2    1.90     0.0   98    98           98    +0
3    Goodnessgraciousme   2    57.0    3    3.50     0.0   91    93           93    +2
4    Royal Invitation     5    55.5    4    5.00     0.0   86    89           89    +3
5    Zinikele             5    58.5    5    5.70     0.0   91    95           95    +4
6    Ginger Delight       3    52.5    6    8.50     2.0   82    79           79    -3
7    Jeanne Darc          3    60.0    7    8.55     2.0   99    94           94    -5
8    Your Ladyship        3    51.0    8    9.35     2.0   76    76           76    +0
9    Littleblackvelvet    4    51.5    9    10.25    0.5   85    80           80    -5
10   Fireburst            3    52.5    10   16.75    2.0   81    79           79    -2
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Ice Rain 87 101 91 +10 0.5 -
2 Lock And Key Line 98 94 98 -4 0.0
3 Goodnessgraciousme 91 86 93 -7 0.0 -
4 Royal Invitation 86 99 89 +10 0.0 -
5 Zinikele 91 89 95 -6 0.0 -
6 Ginger Delight 82 85 79 +6 2.0 -
7 Jeanne Darc 99 83 94 -11 2.0 -
8 Your Ladyship 76 66 76 -10 2.0 -
9 Littleblackvelvet 85 77 80 -3 0.5 -
10 Fireburst 81 80 79 +1 2.0 -
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