You can have a strategy about slowing down the losses you face while gambling. If you lose your bankroll slowly then you can have higher chance to win in the meantime. If you play all in for the first round you can lose all in the beginning, meanwile if you just risk a predefined percentage in every round you can have time to have luck and win. This can be a so called strategy but it's not a strategy of how to win but the strategy of how to lose slower.