Official NHA Assessment

Race 5: YORK RACECOURSE OPEN MAIDEN (For all Maidens)

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Line Horse
Black Platina
Reference for assessment
Exact Matches
2 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
7 / 11
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    Past And Present     3    61.0    1    0.00     5.0   68    61           61    -7
2    Black Platina        2    55.5    2    0.50     0.0   65    65           65    +0
3    Wander Skitt         2    54.5    3    4.10     0.0   65    59           59    -6
4    Peggy Sue Shake      3    52.0    4    4.90     5.0   59    43           49    -10
5    Dee Dee's Delight    3    57.5    5    5.50     5.0   76    54           66    -10
6    Dungeon Master       2    55.0    6    6.00     0.0   66    59           59    -7
7    Happy Hooves         3    57.0    7    7.70     5.0   -     53           53    +53
8    Ada Lovelace         2    49.5    8    7.95     0.0   65    48           55    -10
9    Star Fall            2    50.0    9    9.85     0.0   60    49           50    -10
10   A M C Voter          3    59.5    10   15.35    5.0   -     58           58    +58
99   Strutting            3    59.0    99   0.00     5.0   -     57           57    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Past And Present 68 68 61 +7 5.0 -
2 Black Platina Line 65 65 65 ✓ Match 0.0
3 Wander Skitt 65 72 59 +13 0.0 -
4 Peggy Sue Shake 59 76 49 +27 5.0 -
5 Dee Dee's Delight 76 66 66 ✓ Match 5.0 -
6 Dungeon Master 66 63 59 +4 0.0 -
7 Happy Hooves - 62 53 +9 5.0 -
8 Ada Lovelace 65 72 55 +17 0.0 -
9 Star Fall 60 55 50 +5 0.0 -
10 A M C Voter - - 58 -58 5.0 -
99 Strutting - 79 57 +22 5.0 -
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