Official NHA Assessment

Race 2: GTH 50/50 DASH MR 64 HANDICAP (Open)

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Line Horse
Grey Ocean
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
6 / 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    Giambattista         3    55.5    1    0.00     9.5   55    58           55    +0
2    Grey Ocean           4    60.0    2    1.20     11.0  64    64           64    +0
3    Master Keeku         3    60.0    3    2.00     9.5   64    67           67    +3
4    Woodstock Festival   6    61.0    4    2.30     0.0   66    88           88    +22
5    Blue Eyes            4    61.0    5    4.10     11.0  66    66           66    +0
6    Sleek As Silk        2    57.5    6    6.50     6.5   77    68           68    -9
7    Hallerbos            3    60.0    7    7.00     9.5   64    67           67    +3
8    Pacific Winter       5    59.5    8    9.90     0.0   63    85           85    +22
99   Kalahari Blue        2    60.0    99   0.00     6.5   -     73           73    +0
99   Phaka Imali          3    58.0    99   0.00     9.5   -     63           63    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Giambattista 55 87 55 +32 9.5 -
2 Grey Ocean Line 64 61 64 -3 11.0
3 Master Keeku 64 62 67 -5 9.5 -
4 Woodstock Festival 66 57 88 -31 0.0 -
5 Blue Eyes 66 56 66 -10 11.0 -
6 Sleek As Silk 77 87 68 +19 6.5 -
7 Hallerbos 64 57 67 -10 9.5 -
8 Pacific Winter 63 60 85 -25 0.0 -
99 Kalahari Blue - 75 73 +2 6.5 -
99 Phaka Imali - 62 63 -1 9.5 -
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