Official NHA Assessment

Race 4: 2000 GUINEAS: MYSTIKO (1991) FM 88 HANDICAP (F & M) (For Fillies and Mares)

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Line Horse
Nikiya
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
0 / 9
Within 2 points
Significant Diffs
7 / 9
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    Social Butterfly     4    59.0    1    0.00     6.0   86    79           86    +0
2    Star Act             4    55.0    2    0.60     6.0   78    71           71    -7
3    Nikiya               6    55.0    3    1.60     0.0   83    83           83    +0
4    Calulo               4    58.5    4    2.30     6.0   85    78           78    -7
5    Aunty Lizzy          3    54.0    5    4.30     5.0   83    71           73    -10
6    Pelargonium          3    54.5    6    4.55     5.0   84    72           74    -10
7    Maquette             3    57.5    7    5.85     5.0   90    78           80    -10
8    Travelling Light     5    58.0    8    14.95    0.0   84    89           89    +5
99   Vivid Jet            4    60.5    99   0.00     6.0   -     82           82    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Social Butterfly 86 90 86 +4 6.0 -
2 Star Act 78 81 71 +10 6.0 -
3 Nikiya Line 83 75 83 -8 0.0
4 Calulo 85 88 78 +10 6.0 -
5 Aunty Lizzy 83 84 73 +11 5.0 -
6 Pelargonium 84 84 74 +10 5.0 -
7 Maquette 90 91 80 +11 5.0 -
8 Travelling Light 84 80 89 -9 0.0 -
99 Vivid Jet - 87 82 +5 6.0 -
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