Casino War

About Casino War

Casino War is a very simple coin flip type of a casino card game offered by almost all online casino softwares.

Casino War Rules and Gameplay

The player and dealer are dealt a single card. If player’s card is higher, player wins, if it is lower, player loses. Aces have the highest value and 2s the lowest. If the two cards are tied, player has two options: either surrender and lose half of his bet or go to war and double his bet. If player goes to war, both player and dealer are dealt another card and the winner is the one who has the higher card. However, if player loses at the war, he loses the whole doubled bet, but if he wins, he only wins the original bet and the remaining part of the bet is returned. Another tie during war is a player win. Both Microgaming and Boss Media softwares have additional payout for the second tie so that in this situation player wins 1:1 on the whole doubled bet.

House Edge and Optimal Strategy

The optimal strategy is to always go to war on ties. This reduces the house edge by ~1% compared to surrendering on ties. With the standard rules explained above the house edge is 2.68%. RTG and Chartwell softwares use a single deck which reduces the house edge to 2.28%. The reason for this is reduced occurrence of ties. The house edge under Microgaming and Boss Media softwares (increased payout on second tie) is 2.17%.

Casino War Introduction Video

Variance and Results Over Bonus Wagering Requirement

The standard deviation per round in Casino War is 1.01 which is almost equal to a coin flip. The following table shows Chance of Gain, Risk of Busting and the Bonus EV for different wagering requirements and bet sizes with the standard paytable. See the return and variance calculator for other bet sizes and WRs.

Chance of Gain / Risk of busting

  Bonus Wagering requirement
Bet size 20 x B 40 x B
1 85% / 0% 45% / 10%
2 75% / 1% 48% / 20%
5 67% / 12% 48% / 39%
20 53% / 42% 34% / 62%
Bonus EV 46.4 -7.2


Choose the correct wagering requirement and your preferred bet size. The bet sizes
are relative to 100€ bonus. (ie. for 200€ bonus, multiply the bet size by two).

The table lists Chance of Gain and Risk of busting. The numbers are derived
by simulating 1000 sessions so they are not absolutely accurate.
Chance of Gain = Probability to end up with profit after completing the bonus wagering requirement
Risk of bust = Probability to lose the whole bankroll (deposit and bonus) before completing
the bonus wagering requirement.

The "Bonus EV" lists the expected value of the bonus. The values are relative to 100€ bonus
(ie. For 200€ bonus, multiply the EV by two).