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Last updated: January 15, 2024

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Oasis Poker

Introduction

Oasis

Poker 🧲 is a variation of Caribbean Stud Poker. The rules of Oasis Poker are the same as

Caribbean Stud, except the 🧲 player is allowed to exchange cards before the raise/fold

decision, for a price of course. The game can be found 🧲 mostly in eastern Europe,

northern Africa, and Internet casinos using Galewind Software. Following are the

complete rules.

Rules

The player makes an 🧲 ante wager plus optional side bonus side bet.

Player and the dealer get five cards each. All cards are dealt 🧲 face down, except one

dealer card is exposed. The player may examine his own cards but sharing of information

is 🧲 not allowed. The player has the option to switch one card of his choice for the next

card in the 🧲 deck. There is a fee to do this, equal to the ante wager. This fee is

non-refundable. The player may 🧲 switch one of more cards. The price for switching

depends on the number of cards switched, as follows: One card: 🧲 1x the Ante.

Two cards:

2x the Ante.

Three cards: 3x the Ante.

Four cards: 2x the Ante.

Five cards: 1x the

Ante.

If the 🧲 player switches all five cards, then he must raise. The player may either

fold or raise. If player folds, then 🧲 he forfeits his cards, ante bet, and side bet (if

made). If player raises, then he must make a raise 🧲 wager exactly equal to twice the

ante. The dealer will turn over his other four cards. The dealer must have 🧲 an ace/king

or higher to qualify. In other words, the lowest qualifying hand would be

ace,king,4,3,2. If the dealer does 🧲 not qualify then the player will win even money on

his ante wager and the raise will push. If the 🧲 dealer qualifies and beats the player

both ante and raise will lose. If the dealer qualifies and loses to the 🧲 player then the

ante will pay even money and the raise according to the Raise Pay Table below. Other

pay 🧲 tables have been known to exist. If the player and dealer tie then both the ante

and raise will push. 🧲 The bonus bet win will be entirely based on the poker value of the

player's original hand.

Standard Raise Pay Table 🧲 Hand Pays Royal flush 100 to 1

Straight flush 50 to 1 Four of a kind 20 to 1 Full 🧲 house 7 to 1 Flush 5 to 1 Straight 4

to 1 Three of a kind 3 to 1 Two 🧲 pair 2 to 1 All other 1 to 1

Strategy

I have never

quantified a perfect card switching strategy. My program makes 🧲 a perfect decision every

time by analyzing all possible combinations of the replacement card and all four dealer

cards. However, 🧲 from running through some test hands I believe the following strategy

is close to optimal.

The player should switch one card 🧲 with any of the following:

Four

to a straight flush and royal flush, even breaking up a pair Four to a 🧲 flush with no

pair. Four to an outside straight with no pair.

The player will sometimes switch with

any of the 🧲 following:

Four to a flush with a low pair (depends on the pair and dealer's

up card). Four to an inside 🧲 straight with no pair (depends on the inside straight and

dealer's up card).

My apologies for not being more specific. In 🧲 my view there, is not

enough demand for the information to warrant doing a more detailed strategy.

Do not

switch with 🧲 two pair or three of a kind.

If the casino allows switching two or more

cards that option should never be 🧲 taken.

Once the switch decision has been made the

player can follow Caribbean Stud Poker strategy when deciding to raise or

🧲 fold.

Odds

The following return table is based on the pay table above. Other pay tables

are known to exist, which would 🧲 change the odds.

Return Table Event Switch Pays

Combinations Probability Return Player wins with royal flush No 201 703909080 0.000001

0.000169 🧲 Player wins with straight flush No 101 6591048240 0.000008 0.000795 Player

wins with four of a kind No 41 118962303600 🧲 0.000142 0.005826 Player wins with full

house No 15 698227961760 0.000834 0.01251 Player wins with flush No 11 917993591760

0.001097 🧲 0.012062 Player wins with straight No 9 1839831676200 0.002198 0.019779 Player

wins with three of a kind No 7 9838202449440 🧲 0.011751 0.08226 Player wins with two pair

No 5 20496509853120 0.024482 0.122412 Player wins with pair or less No 3 🧲 97623586047960

0.116608 0.349824 Dealer doesn't qualify No 1 185955255229464 0.222117 0.222117 Tie No

0 12240105192 0.000015 0 Player folds No 🧲 -1 339591911883840 0.40563 -0.40563 Player

loses No -3 109793339508384 0.131144 -0.393433 Player wins with royal flush Yes 200

2650657380 0.000003 🧲 0.000633 Player wins with straight flush Yes 100 24129845136

0.000029 0.002882 Player wins with four of a kind Yes 40 🧲 0 0 0 Player wins with full

house Yes 14 0 0 0 Player wins with flush Yes 10 3022953154968 🧲 0.003611 0.036108 Player

wins with straight Yes 8 3012064741860 0.003598 0.028782 Player wins with three of a

kind Yes 6 🧲 0 0 0 Player wins with two pair Yes 4 0 0 0 Player wins with pair or less

Yes 🧲 2 5747378958780 0.006865 0.01373 Dealer doesn't qualify Yes 0 14509998995172

0.017332 0 Tie Yes -1 1981751652 0.000002 -0.000002 Player folds 🧲 Yes -2 37230605388900

0.044471 -0.088941 Player loses Yes -4 6750562960512 0.008063 -0.032253 Total

837195681722400 1 -0.010372

The lower right cell shows 🧲 a house edge of 1.04%.

After

possibly switching and raising, the average final bet, including the switching fee,

will be 2.183772 🧲 units. The element of risk is thus 0.475%. On average the player will

switch 8.4% of the time.

At Internet casinos 🧲 using Galewind Software there are some

rule changes. There the player may switch one to five cards, for the price 🧲 of one ante

per card, and a full house pays 6 instead of 7. Under those rules the house edge 🧲 is

1.204%, the average final wager is 2.184 units, and the element of risk is 0.55%.

Side

Bet

I indicate the odds 🧲 of the side bet in my Caribbean Stud Poker section. Some

casinos have been known to base the side bet 🧲 on the hand after switching. This can be a

very good rule for the player. However, if you see it, 🧲 you're on your own.

Belgium

Variant

In Belgium the player is allowed to switch a card, but if he does, he forfeits

🧲 his option to fold. That version of the rules is addressed in my section on Belgium

Variant of Oasis Poker.

Nicaragua 🧲 Variant

Oasis Poker is very popular in Nicaragua. It

seems to have more placements than any other game. However, they call 🧲 it Caribbean Stud

Poker. The pay table is the standard one for the original hand. However, it is

depressed if 🧲 the player switches a card, which still costs the price of the Ante

bet.

This variant has never been analyzed, as 🧲 far as I know.

Nicaragua Variant Pay

Table Hand Original

Hand After

Discard Royal flush 100 50 Straight flush 50 20 Four of

🧲 a kind 20 10 Full house 7 5 Flush 5 4 Straight 4 3 Three of a kind 3 3 🧲 Two pair 2 2 All

other 1 1

As a variant of the Nicaragua variant, the Palms casino in Managua lets 🧲 the

player buy a sixth card for the price of the Ante, as opposed to discarding. This, too,

has not 🧲 been analyzed (sorry).

Finland Variant

At the Casino Helsinki the following

rule changes are followed:

The player may exchange only one card from 🧲 his hand with

cost of 1 x ante.

If the dealer doesn't qualify player may exchange one card from the

dealers 🧲 hand (see Russian Poker above) to make the dealer to qualify.

Jackpot Bonus

side bet available.

Jackpot Bonus payout

Royal Flush: Jackpot (minimum 🧲 amount

€20,000)

Straight Flush: 20% of the jackpot

Four of a kind: 250 for 1

Full House: 150

for 1

Flush: 100 for 1

Straight: 🧲 50 for 1

Written by: Michael Shackleford

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