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Draw (poker) : ウィキペディア英語版
Draw (poker)

A poker player is drawing if they have a hand that is incomplete and needs further cards to become valuable. The hand itself is called a draw or drawing hand. For example, in seven-card stud, if four of a player's first five cards are all spades, but the hand is otherwise weak, they are ''drawing to'' a flush. In contrast, a made hand already has value and does not necessarily need to draw to win. A made starting hand with no help can lose to an inferior starting hand with a favorable draw. If an opponent has a made hand that will beat the player's draw, then the player is ''drawing dead''; even if they make their desired hand, they will lose. Not only draws benefit from additional cards; many made hands can be improved by catching an out — and may have to in order to win.
==Outs==
An unseen card that would improve a drawing hand to a likely winner is an out. ''Playing a drawing hand has a positive expectation if the probability of catching an out is greater than the pot odds offered by the pot.''
The probability P_1 of catching an out with one card to come is:
:P_1 = \frac\,\,\mathrm}
The probability P_2 of catching at least one out with two cards to come is:
:P_2 = 1 - \frac}} \times \frac - 1} - 1}
:non outs = } -\mathrm

A dead out is a card that would normally be considered an out for a particular drawing hand, but should be excluded when calculating the probability of catching an out. Outs can be dead for two reasons:
* A dead out may work to improve an opponent's hand to a superior hand. For example, if Ted has a spade flush draw and Alice has an outside straight draw, any spades that complete Alice's straight are dead outs because they would also give Ted a flush.
* A dead out may have already been seen. In some game variations such as stud poker, some of the cards held by each player are seen by all players.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Draw (poker)」の詳細全文を読む



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