What are the 42 rules of Texas Hold 'em?

The "42 Rule" of Texas Hold 'em is a quick way to estimate the probability of the card you want. The probability of card completion calculated by the "four-two rule" is not absolutely accurate, but it is not bad on the whole. It can be described as simple and practical.

Rule 42 in Texas Hold 'em is a simple way to estimate probability. After the flop, suppose you have two cards 8 and 9 and turn out three A, 6 and 7. We have two chances to deal, and 5 or 10 will make a straight.

5 or 10 * * has eight cards you want, then the probability of you getting a straight in two rounds is:1-(47-8)/47 * (46-8)/46 = 0.3145, which is about 3/kloc-0.

So suppose we turn a Q, we also need 8 cards, 8*2= 16, which means you have a straight chance of winning, which is basically the same as the actual 17%, which is the "two" in the 42 law.