Casino War Odds & Strategy: The Simplest Edge in the House

Casino War is the simplest game on the casino floor: high card wins. There’s exactly one decision — what to do on a tie — and the answer is always the same. Going to war carries a 2.88% house edge (6 decks), surrendering is worse at 3.70%, and the 10:1 Tie side bet is a brutal 18.65% trap. Here’s why.

How the game works

You bet the ante. You and the dealer each get one card; aces are high and suits are ignored. Higher card wins even money, lower card loses. On its own, that’s a coin flip with no edge either way.

The edge lives entirely in the tie — which happens about 7.4% of the time (23 in 311, with 6 decks).

The one decision: surrender or war

When your card matches the dealer’s rank, you choose:

• Go to war — raise a second bet equal to your ante. The dealer burns three cards and deals one more card to each of you. Your card higher or equal wins; lower loses.
• Surrender — forfeit half your ante and end the hand.

Always go to war. It’s the entire strategy, and it’s provable: warring costs 2.88% of your ante over time; surrendering every tie costs 3.70%. There is no situation, no “read,” no card that changes this — Casino War has no other decisions to make.

Why war still favors the house

Here’s the trick that turns a coin flip into a house game. When you go to war you risk two units (ante + raise), but winning only pays one: the raise pays even money while your original ante simply pushes. Ties in the war go to the player, so you win a bit more than half of wars — but not nearly enough to justify risking two to win one. That asymmetry is the whole 2.88%.

Surrendering feels safer, but giving back half your bet on every tie adds up to more than warring does. The lesser evil wins.

The Tie side bet is a trap

Most tables dangle a side bet that the opening two cards will tie, paying 10 to 1. A tie hits only 7.4% of the time — about 1 in 13.5 — so a fair payout would be roughly 12.5 to 1. That gap is a 18.65% house edge, around six times the main game and one of the worst bets you’ll find anywhere. Never take it.

Is Casino War worth playing?

As casino games go, 2.88% is genuinely low — better than roulette, in the neighborhood of a soft blackjack game — if you always go to war and skip the side bet. It won’t make you a winner (nothing at −EV does), but it’s a cheap, brainless way to sit at a table. Just know that “low edge” still means the house wins over time, and the doubled war bets make your bankroll swing a little harder than a pure coin flip.

Want to see it? Play Casino War free → and watch the 2.88% emerge over a few thousand hands in the Lab — or see how it stacks up against every other game in the house-edge chart.