Casino War rules and odds

What Casino War is and how a hand plays out

Casino War takes the children’s card game and turns it into a house-banked bet. You place a stake, the dealer turns over one card for you and one for themselves, and the higher card wins. Aces rank highest, twos lowest, and suits play no part. A win pays even money, so a £10 bet returns £20 including your stake.

It sits in our casino poker games hub because it uses a standard deck and poker card ranks, but there is no hand-building at all. Compared with Three Card Poker or Casino Hold’em, it is pure chance with a single decision that only appears when the two cards match.

Most versions deal from a shoe of six standard decks, 312 cards in all. That deck count matters, because it decides how often ties turn up, and ties are where the house collects its edge.

Casino War rules step by step

The flow of a round is short. Here is what happens from the moment you place a chip, based on the rules described by the Wizard of Odds Casino War page (opens in a new tab).

1. Place your main bet, and the optional tie bet if you want it.
2. The dealer gives you one card face up and takes one card face up.
3. If your card is higher, you win even money. If the dealer’s is higher, you lose the stake.
4. If the cards match, the tie bet (if placed) is paid, and you must choose: surrender or go to war.
5. Surrender: you give up half your main bet and the hand ends.
6. Go to war: you add a raise equal to your original bet, and you and the dealer each get one more card.
7. If your war card equals or beats the dealer’s, the raise wins even money and the original bet pushes. If it is lower, you lose both.

Casino War odds: how often ties happen

The whole game turns on one probability. Once the dealer’s card is out, 311 cards remain in a six-deck shoe. Of those, 23 share the dealer’s rank (24 of each rank in six decks, minus the one already dealt). So the chance of a tie is 23 ÷ 311, or about 7.40%, which is roughly 1 hand in 13.5.

The other 288 cards split evenly between higher and lower, so outside ties you and the dealer are level: each side wins 144 out of 311 times, about 46.30%. The house gets nothing from the ordinary hands; its whole advantage comes from how ties are settled.

This is the same counting method used across our casino probability basics guide: count the cards that produce an outcome, divide by the cards left.

Go to war or surrender? The cost of each choice

On a tie you face the only real decision in the game. Standard game maths makes the answer clear: going to war is cheaper. With six decks and no tie-after-tie bonus, always going to war gives a 2.88% house edge. Always surrendering gives 3.70%. If the casino pays a bonus when the war hand also ties, going to war drops to 2.33%.

Why does war cost the house less? When you surrender, you lock in a loss of half your bet. When you go to war, the extra raise is a near coin flip that leans your way, because a tie on the war card counts as a win for the raise. You still risk more money, but the expected result is better than throwing away half the stake.

The pound figures use the simple rule from our house edge guide: average loss equals stake multiplied by the edge. They are long-run averages. A single session of 100 hands can finish well ahead or well behind, because the swings in any short run dwarf a 2.88% edge.

Going to war means putting more money on the table at the moment you have already been dealt a tie. If that extra stake would take you past the budget you set, the better choice is to stop, not to surrender and carry on.

A worked example of a Casino War round

Say you bet £10. You are dealt the 8 of clubs and the dealer turns the 8 of hearts. It’s a tie, so you choose to go to war and add another £10, putting £20 at risk.

• You draw a queen and the dealer draws a 5: your raise wins £10 and your original £10 pushes. Net result: +£10.
• You draw a 9 and the dealer draws a 9: the raise still wins, because equal counts as a win in the war. Net result: +£10.
• You draw a 4 and the dealer draws a jack: you lose both stakes. Net result: −£20.

Had you surrendered instead, the round would have ended at −£5 every time. That certainty feels safe, but over many ties it costs more than going to war, which is why the surrender line carries the higher 3.70% edge.

The Casino War tie bet: payout and house edge

Many tables offer a side bet that the first two cards will tie. The usual payout is 10 to 1. With six decks the maths is easy to show: 23 times in 311 you win £100 on a £10 bet, and 288 times in 311 you lose £10. That works out to (230 − 288) ÷ 311, a loss of about 18.65p per £1 staked, matching the 18.65% house edge published for the bet.

Some online versions pay more. The Wizard of Odds notes that Habanero’s game pays 11 to 1, which cuts the edge to 11.25%: (253 − 288) ÷ 311. Better, but still about four times the cost of the main bet. Our list of the worst bets in the casino covers more side bets in this range.

Common Casino War mistakes and myths

• Surrendering to save money. It feels thrifty, but it raises the house edge from 2.88% to 3.70%.
• Backing the tie bet because a tie is ‘due’. Online, every hand comes from a freshly shuffled deck, so earlier ties tell you nothing; see our gambler’s fallacy page. The bet’s 18.65% edge stays the same.
• Raising stakes after losses. Doubling up after a losing hand is a Martingale-style plan. It doesn’t change the edge and can burn through a budget quickly once a losing run meets the table limit.
• Thinking card counting helps. Online RNG versions reshuffle every hand, and the edge comes from tie rules rather than the cards left, so tracking cards gives no practical help.
• Treating a simple game as a cheap one. Fast, simple rounds mean more hands per hour, and more hands means more total cost even at a modest edge.

Playing Casino War online in the UK

Casino War appears in some UK casino lobbies as an RNG table game, where software deals the cards. Each round counts as a casino game under the Gambling Commission’s technical standards, so it must allow at least 5 seconds per game cycle, autoplay is not allowed, and the site must show your net spend and time played in real time. At 5 seconds a round, that is a ceiling of 720 rounds an hour, so a £10 player who kept going at full speed could, on average, lose £207 an hour at a 2.88% edge. Real play is normally slower, but the arithmetic shows why speed matters; our cost per hour guide explains the method.

The online slot stake limits of £5 and £2 apply to reel-based slots only, so a Casino War table sets its own minimum and maximum. Check them in the game’s information panel. Our game speed rules page covers the timing rules in full.

Availability varies, so check each casino’s game lobby rather than assuming a particular version is offered.

If play stops feeling like entertainment, free and confidential help is available from the National Gambling Helpline on 0808 8020 133 and from GamCare’s support services (opens in a new tab), and our safer gambling hub lists the tools every UK casino offers.

Casino War against other simple table games

Casino War is often compared with baccarat, another quick game where you mostly just back a side. Baccarat’s main bets are cheaper, and blackjack played with good strategy usually costs less again. Against the house-banked poker family, the war line at 2.88% sits close to Ultimate Texas Hold’em when that game’s edge is measured against the Ante, though the poker games ask far more decisions of you.

For a broader ranking, our casino poker house edge page puts every game in this family side by side. The Wizard of Odds house edge table (opens in a new tab) is a handy cross-check.

Where to play Casino War online

Our partner welcome offers are aimed at slots, not at card tables like Casino War. Table games are often excluded from bonus wagering or count for less, so read the terms before you assume a bonus can be used here. All offers are 18+ and terms apply.

• Casumo: opt in and deposit at least £20 for a 50% first-deposit bonus up to £100; wager the bonus 10x within 7 days, with a £5 maximum bet while it is active. Game, play and payment restrictions apply.
• 10bet: choose the casino welcome bonus at sign-up and make your first deposit within 7 days for a 100% match up to £25; wager it 10x on slots within 3 days. Bonus winnings are capped at £1,000 and Skrill and Neteller deposits are excluded.
• Coral: between 1 October 2026 and 1 February 2027, deposit (some methods excluded) and bet £10 or more on slots to get 100 free spins worth 10p each on selected games. Accept them within 48 hours and use them within 7 days; spin winnings carry no wagering.

For card games, look at each site’s table lobby. Our Casumo review and 10bet review explain what each casino publishes about its games.

18+. Every casino game has a built-in house edge, so over time you should expect to lose what you stake. Set a budget before you play and stop when it’s gone: safer gambling tools and support. Free, confidential help: National Gambling Helpline 0808 8020 133.