Just to try to make you more comfortable with accepting doubled, or tripled or quadrupled pawns in your own games :)
Solve this puzzle first :
http://chesstempo.com/chess-tactics/73599
Then check the whole game :
en.lichess.org/0C7cJFVD#68
Solve this puzzle first :
http://chesstempo.com/chess-tactics/73599
Then check the whole game :
en.lichess.org/0C7cJFVD#68