When playing blackjack should know that in the event that the dealer receives an ace faced up has a duty to ask players if they want to secure their hands. Here comes the dilemma of the players, because no one knows whether to take precautions and prevent a blackjack of banking or not. In case of who is playing blackjack accepts insurance, puts half his original bet and if the dealer gets a blackjack does not lose the total of the bet.
In a concrete example perhaps we could see it better: if a player receives a figure and an ace and the dealer has discovered an ace, surely the player tends to protect his hand asking for the insurance.
But who plays blackjack should know that insurance is not synonymous of profits, because if in a deck of 52 cards 16 are valued with 10 and 36 with different values, we have a ratio of 2.25 to 1. As a player only pays 2:1, will be the player who has a disadvantage in that case.
Therefore if you have blackjack and the dealer has shown an ace the equation is this: 15 cards with a value of 10 and the remaining 34. Knowing that the dealer should get a 10 to achieve a blackjack, your chances of achieving this are of 30%. This means that you have a 70% chance of winning, so you will have a better chance if you do not accept insurance.
The situation becomes more complex when one takes into account the other players on the table, so when you play blackjack online do not despair, look at your cards and those of others and explore their chances well before deciding and have always in mind that you are playing for fun, so try to follow your instincts and have a good time.