Tournament of RPS contest

RPS contest

def game(match)
  
  if match[0][1].upcase =="R" 
    if match[1][1].upcase == "P" 
      match[1]
    elsif match[1][1].upcase == "S" 
      match[0]
    else
     "It's a Tie!"
    end
     
  elsif match[0][1].upcase =="P" 
     if match[1][1].upcase == "S"
       match[1]
     elsif match[1][1].upcase == "R"
       match[0]
     else
      "It's a Tie!"
     end
   
  elsif match[0][1].upcase =="S" 
    if match[1][1].upcase == "R"
      match[1]
    elsif match[1][1].upcase == "P"
      match[0]
    else
     "It's a Tie!"
    end
  end 
     
end

def find_winner(tourney)

  if tourney[0][0].class == String
     game(tourney)
  else
      
         # a = find_winner(tourney[0])
         #          b = find_winner(tourney[-1])
         #          game([a,b])
         
         game([find_winner(tourney[0]), find_winner(tourney[-1])])
         
  end
end