1. e4 c5 2. Nc3 e6 3. d4 d5 is a French, #225
                
     Merged
            
            
          
      
        
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and not a Sicilian.
See also the discussion here: https://chess.stackexchange.com/questions/46857/sicilian-defense-marshall-gambit-does-lichess-classify-this-correctly Or chess.com's categorization here: https://www.chess.com/openings/French-Defense-Marshall-Variation
fixes #224