Game center both games

While it was not necessary for the project, I found that Peter/Abhi's handling of this was exceptional. That is, to have a hash that points from one result to the other: 
@@win_hash = { "paper" => "rock", "rock" => "scissors", "scissors" => "paper" }

Then the evaluation method:
if @@win_hash[player_1_choice] == player_2_choice
"Player 1 wins"
elsif @@win_hash[player_2_choice] == player_1_choice
"Player 2 wins"
else
"Draw"
end