Official NHA Assessment

Race 6: MERCURY SPRINT (Grade 1) (Horses at Weight-For-Age)

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Line Horse
I Am Giant
Reference for assessment
Exact Matches
0 / 13
Calculated = Official
Close Matches
6 / 13
Within 2 points
Significant Diffs
3 / 13
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    Surjay               3    60.0    1    0.00     1.5   119   116          116   -3
2    Lucky Lad            4    59.5    2    0.70     2.0   125   114          115   -10
3    Royal Aussie         2    60.0    3    0.75     0.5   124   118          118   -6
4    Sun Blushed          2    60.0    4    1.05     0.5   116   118          118   +2
5    At My Command        2    60.0    5    1.35     0.5   119   118          118   -1
6    I Am Giant           2    60.0    6    2.05     0.5   118   118          118   +0
7    Mrs Browning         5    57.5    7    2.20     0.0   118   114          114   -4
8    Gladatorian          5    60.0    8    2.30     0.0   120   119          119   -1
9    Snow Pilot           2    59.5    9    4.20     0.5   120   117          117   -3
10   Cruise Control       5    60.0    10   4.90     0.0   118   119          119   +1
11   Quasiforsure         4    60.0    11   7.10     2.0   115   115          115   +0
12   Golden Sickle        4    57.0    12   9.60     2.0   122   109          112   -10
99   Just Be Lekker       4    57.0    99   0.00     2.0   -     109          109   +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Surjay 119 121 116 +5 1.5 -
2 Lucky Lad 125 118 115 +3 2.0 -
3 Royal Aussie 124 120 118 +2 0.5 -
4 Sun Blushed 116 120 118 +2 0.5 -
5 At My Command 119 116 118 -2 0.5 -
6 I Am Giant Line 118 124 118 +6 0.5
7 Mrs Browning 118 115 114 +1 0.0 -
8 Gladatorian 120 127 119 +8 0.0 -
9 Snow Pilot 120 122 117 +5 0.5 -
10 Cruise Control 118 117 119 -2 0.0 -
11 Quasiforsure 115 116 115 +1 2.0 -
12 Golden Sickle 122 121 112 +9 2.0 -
99 Just Be Lekker - 113 109 +4 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