Official NHA Assessment

Race 4: OPEN A tabGOLD ACCOUNT - 031 314 1874 MR 84 HANDICAP (Open)

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Line Horse
Electric Surge
Reference for assessment
Exact Matches
0 / 12
Calculated = Official
Close Matches
3 / 12
Within 2 points
Significant Diffs
7 / 12
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    Chewbaca             5    55.5    1    0.00     0.0   75    71           75    +0
2    Great Affair         7    58.5    2    1.40     0.0   82    82           82    +0
3    Electric Surge       5    55.0    3    2.40     0.0   74    74           74    +0
4    Space News           4    52.0    4    4.30     1.5   72    62           62    -10
5    Billy Bazooka        3    48.0    5    4.70     4.5   75    48           65    -10
6    Querari's Cowboy     5    50.5    6    8.20     0.0   73    61           63    -10
7    Twice Golden         5    48.0    7    9.30     0.0   60    56           56    -4
8    A Whole New World    4    53.0    8    15.20    1.5   71    63           63    -8
9    Extract              3    52.0    9    17.70    4.5   65    55           55    -10
10   The Kop              4    60.0    10   30.00    1.5   85    77           77    -8
11   Mystery Boy          4    57.5    11   34.30    1.5   80    72           72    -8
99   Rex Union            4    57.5    99   0.00     1.5   -     72           72    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Chewbaca 75 87 75 +12 0.0 -
2 Great Affair 82 63 82 -19 0.0 -
3 Electric Surge Line 74 83 74 +9 0.0
4 Space News 72 52 62 -10 1.5 -
5 Billy Bazooka 75 62 65 -3 4.5 -
6 Querari's Cowboy 73 62 63 -1 0.0 -
7 Twice Golden 60 84 56 +28 0.0 -
8 A Whole New World 71 65 63 +2 1.5 -
9 Extract 65 60 55 +5 4.5 -
10 The Kop 85 78 77 +1 1.5 -
11 Mystery Boy 80 80 72 +8 1.5 -
99 Rex Union - 97 72 +25 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