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Oasis Poker (Belgium Rules)


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, for a price of course. Under the version addressed in this page the player may not fold if he chooses to switch cards. I call this the "Belgium Variant", because that is how I understand the game is played in that country. For the more liberal, and more common, version, where the player may still fold after switching please see my main page on Oasis Poker.


  1. The player makes an ante wager plus optional side bonus side bet.
  2. 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.
  3. 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.
  4. The player may switch one or more cards. The fee for switching one card equals the ante, the fee for switching two cards is two times the ante, three cards for three times the ante, four cards for two times the ante, and five cards for one times the ante.
  5. If the player did not switch, then the player may either fold or raise. Under the Belgium rules addressed here, the player may not fold after switching, and must raise.
  6. If player folds he forfeits his cards, ante bet, and side bet (if made).
  7. If player raises then he must make a raise wager exactly equal to twice the ante.
  8. The dealer will turn over his other four cards.
  9. 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.
  10. If the dealer does not qualify then the player will win even money on his ante wager and the raise will push.
  11. If the dealer qualifies and beats the player both ante and raise will lose.
  12. 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.
  13. If the player and dealer tie then both the ante and raise will push.
  14. 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


Sorry, I have not quantified the strategy for the Belgium rules yet. I do indicate strategy when the player can fold after switching in my main page on Oasis Poker. It could be said, if you shouldn't switch there, you shouldn't switch under the Belgium rules. I can also say that the player should never switch more than one card.


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 less than pair No 3 519918649992 0.000621 0.001863
Player wins with pair No 3 97251001148448 0.116163 0.348488
Player wins with two pair No 5 20496509853120 0.024482 0.122412
Player wins with three of a kind No 7 9838202149440 0.011751 0.08226
Player wins with straight No 9 1839831676200 0.002198 0.019779
Player wins with flush No 11 917993591760 0.001097 0.012062
Player wins with full house No 15 698227961760 0.000834 0.01251
Player wins with four of a kind No 41 118962303600 0.000142 0.005826
Player wins with straight flush No 101 6591048240 0.000008 0.000795
Player wins with royal flush No 201 703909080 0.000001 0.000169
Player folds No -1 350199573958080 0.418301 -0.418301
Dealer wins No -3 110160790094376 0.131583 -0.394749
Tie No 0 12245244480 0.000015 0
Dealer doesn't qualify No 1 186276735354024 0.222501 0.222501
Player wins with less than pair Yes 2 231168296652 0.000276 0.000552
Player wins with pair Yes 2 4552545523776 0.005438 0.010876
Player wins with two pair Yes 4 0 0 0
Player wins with three of a kind Yes 6 0 0 0
Player wins with straight Yes 8 2425354400484 0.002897 0.023176
Player wins with flush Yes 10 2941258372836 0.003513 0.035132
Player wins with full house Yes 14 0 0 0
Player wins with four of a kind Yes 40 0 0 0
Player wins with straight flush Yes 100 23986089120 0.000029 0.002865
Player wins with royal flush Yes 200 2650657380 0.000003 0.000633
Player loses Yes -4 22671717526860 0.027081 -0.108322
Tie Yes -1 1909031844 0.000002 -0.000002
Dealer doesn't qualify Yes 0 26007804880848 0.031065 0
Total 837195681722400 1 -0.019476

The lower right cell shows a house edge of 1.95%.

After possibly switching and raising, the average final bet, including the switching fee, will be 2.34 units. The element of risk is thus 1.95%/2.34 = 0.87%. On average, the player will switch 7.03% of the time.

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.


I have an unconfirmed report from a reader that in Belgium the player may not switch one card only. The above analysis is not based on this alleged correction.