General speaking,when you only want to win,you will lose the fun of playing a game.

Generally speaking,you will lose the fun of playing a game if you just want to win it.
注：原文不能说错,但我觉得原文中when you only want to win有点中式英语的味道,换成if从句要自然一点.win后加个it指代the game,意思更加清楚.