It's advisable to only do this when you have a sturdy hand compared to the dealer, otherwise it really is a losing play. https://www.avenue-x.com/cgi-bin/gforum.cgi?url=https://outofthepublicsquare.com/%EC%B5%9C%EA%B3%A0%EC%9D%98-%EC%98%A8%EB%9D%BC%EC%9D%B8-%EC%B9%B4%EC%A7%80%EB%85%B8-%EC%8B%A0%EA%B7%9C-%EA%B0%80%EC%9E%85-%EB%B3%B4%EB%84%88%EC%8A%A4-%ED%98%9C%ED%83%9D-%EC%95%8C%EC%95%84%EB%B3%B4/