players can "go along" (deposit the minimum bet), "Increase"
(increase the bet) or "Adjust" (leave the round). The next section
is the "flop" - the dealer places three cards in this section open
on the table. This is followed by a second betting round and the
dealer places another card face up on the table. This is called the
"turn". Once the card is face-up, followed by the third round of
betting. Thereafter, the dealer deals a fifth card face up on the
table. This fifth card is called the "river". Each player can use
the community cards to complete his hand.
It follows finally a fourth round of betting. All players who did not fit over the betting rounds take part. The last section is the showdown, in which the winner of the round is determined. On the turn you have a flush draw, you hold two hearts and there are two hearts on the board. They calculated that there are 46 cards that you do not know (you know 4 on the flop and your two hole cards). Of which there are 9 cards that can give you the flush (the remaining 9 hearts). Under these circumstances, you would divide 37 by 9, what you are about 4.1-1 odds, the flush draw on the river. Ensure that decisions at this point make sense, the size of the pot would have four times as large as the bet to be, before you are (eg, means $ 50 bet $ 200 pot), so you could justify the call.
They are hoping for an inside straight draw on the turn and count out that there are only 4 cards that can help you with 42 other cards which do not improve your hand. By using the formula and divide 42 by 4, you come to the conclusion that the chances of beating this hand, 10.5-1 are, and that there should be a pot size of $ 1,500 for a $ 100 bet that the would call sense. This is a fundamental mistake that many players, and it can have serious effects on your bankroll.