Official NHA Assessment

Race 8: REN-FORM MR 80 HANDICAP (Open)

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Line Horse
Ampersand
Reference for assessment
Exact Matches
0 / 13
Calculated = Official
Close Matches
3 / 13
Within 2 points
Significant Diffs
7 / 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    Passage Of Power     6    61.5    1    0.00     0.0   86    101          86    +0
2    Coming In Hot        3    59.5    2    0.75     7.5   79    82           82    +3
3    Ampersand            2    56.0    3    1.25     5.0   80    80           80    +0
4    Peace Treaty         3    58.0    4    2.00     7.5   86    79           79    -7
5    Secret Chord         4    55.5    5    2.50     9.0   76    71           71    -5
6    Cornwall             3    62.0    6    3.25     7.5   84    87           87    +3
7    Prince Of Kildare    4    57.5    7    3.50     9.0   75    75           75    +0
8    King Of Numbers      4    56.5    8    5.25     9.0   73    73           73    +0
9    Vegas Hi Rise        6    58.5    9    5.75     0.0   77    95           95    +18
10   Zafar                3    56.5    10   12.25    7.5   83    76           76    -7
11   Copper John          4    55.0    11   15.75    9.0   70    70           70    +0
99   Bridge Of Spies      6    52.0    99   0.00     0.0   -     82           82    +0
99   Fastnet Filly (IRE)  5    57.0    99   0.00     0.0   -     92           92    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Passage Of Power 86 76 86 -10 0.0 -
2 Coming In Hot 79 76 82 -6 7.5 -
3 Ampersand Line 80 83 80 +3 5.0
4 Peace Treaty 86 69 79 -10 7.5 -
5 Secret Chord 76 92 71 +21 9.0 -
6 Cornwall 84 84 87 -3 7.5 -
7 Prince Of Kildare 75 80 75 +5 9.0 -
8 King Of Numbers 73 75 73 +2 9.0 -
9 Vegas Hi Rise 77 71 95 -24 0.0 -
10 Zafar 83 78 76 +2 7.5 -
11 Copper John 70 61 70 -9 9.0 -
99 Bridge Of Spies - 48 82 -34 0.0 -
99 Fastnet Filly (IRE) - 94 92 +2 0.0 -
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