new.html.erb

<%= form_for [@game, @result], html: {id: "form-results"} do |f| %>
  <%= f.error_messages %>

  <% @result.teams.each.with_index do |team, index| %>
    <%= select "result[teams][#{index}]", "players", player_options, {include_blank: ''}, class: "players", multiple: @game.max_number_of_players_per_team != 1, "data-placeholder" => "Team #{index + 1}" %>

    <% if index != @result.teams.size - 1 %>
      <br/>
      <%= select "result[teams][#{index}]", :relation, ["defeats", "ties"], {} %>
    <% end %>
  <% end %>

  <div class='form-actions'>
    <%= f.submit class: "btn btn-primary", value: 'Save Result' %>
  </div>
  
<% end %>

<%= javascript_tag do %>
  $(".players").chosen();
<% end %>