title: Pandas DataFrame, merging two DF together with awkward data
body: <p>I'm trying to merge data from dataframe A onto dataframe B with limited knowledge of panda.</p>
  <p><strong>DF A:</strong></p>
  <pre><code>      game_id  team_id      score
  0  2000020001       21  39.703125
  1  2000020001       25  38.386148
  2  2000020002        6  35.527686
  3  2000020002        9  45.862678
  4  2000020003        7  35.376138
  5  2000020003        7  32.786932
  
  </code></pre>
  <p><strong>DF B:</strong></p>
  <pre><code>            away_team_id home_team_id  away_score  home_score
  game_id
  2000020001            21           25
  2000020002             6            9
  2000020003             7            4
  </code></pre>
  <p><strong>Final Result Wanted:</strong></p>
  <pre><code>            away_team_id home_team_id   away_score  home_score
  game_id
  2000020001            21           25    39.703125   38.386148
  2000020002             6            9    35.527686   45.862678
  2000020003             7            4    35.376138   32.786932
  </code></pre>
  <p>How would one go about doing so? Any help would be appreciated.</p>