Play Bridge Online vs the Computer
Play contract bridge directly against the computer — free, in your browser, with no download and no sign-up. You sit South; the AI plays North (your partner), East and West. Bid a standard SAYC auction to reach a contract, then declare or defend as the play runs to thirteen tricks. This is a single-player game built around an honest AI opponent: a determinized Monte-Carlo engine that deals the unseen hands many plausible ways and plays each out to estimate your chances. Ask for a hint, watch the live make-probability for the current contract, step through the play one card at a time, or let the AI auto-play the rest of a hand.
How the AI thinks
Bridge is not a perfect-information game — you can see only your own thirteen cards and the exposed dummy — so the opponent here cannot use plain minimax the way our chess or checkers engines do. Instead it uses determinized Monte-Carlo sampling: it repeatedly deals the cards it cannot see into the remaining hands in ways consistent with the auction and everything played so far, then plays each imagined deal out to the end with a fast heuristic. Averaging the outcome over many such deals gives every candidate card (or bid) an estimated success rate, and the AI plays the one that scores best. The same sampling machinery powers the make-probability readout: it is simply the fraction of simulated deals in which the current contract comes home. The whole engine runs locally in your browser; nothing is sent to a server, and we do not claim it plays perfectly.
How to play bridge — the rules
- The auction. Starting from the dealer, each player bids in turn using a standard SAYC (Standard American Yellow Card) system, passes, doubles or redoubles, until three consecutive passes set the final contract.
- Declarer and dummy. The player from the winning side who first named the contract's strain becomes declarer; declarer's partner is dummy and plays face-up on the table once the opening lead is made.
- Follow suit. Whoever leads a trick sets the suit; every other player must follow suit if able. The highest card of the led suit wins, unless the contract has a trump suit and someone trumps in.
- Scoring the hand. Declarer's side needs to take at least the number of tricks bid (six plus the contract level) to make the contract; falling short means going down. Overtricks and doubling adjust the score.
- Hint and make-probability. Hint asks the engine for a strong card on your turn. The make-% readout runs the same Monte-Carlo sampling live so you can see how the odds shift as the hand is played.
Tips to beat the AI
- Count the hand. Track how many cards of each suit have appeared; once a suit is exhausted in a hand you know exactly what remains unseen.
- Plan the play before the first card falls. As declarer, count your top tricks and work out where the extra ones must come from before you touch a card from dummy.
- Watch the make-probability. A contract that starts as a clear favorite can swing hard on a single missed finesse — the live readout shows exactly when that happens.
- Signal with your discards. As a defender, the order and size of the cards you play carry information about your hand — use that discipline against the AI too.
FAQ
Can I play bridge online against the computer?
Yes — this page is a full online bridge game against the computer. Bid the auction, then play the cards against three AI opponents. Works on desktop and mobile, free, with no account.
How strong is the bridge AI?
The bridge AI uses determinized Monte-Carlo — it deals the unseen cards many plausible ways, plays each imagined deal out to the end, and picks the card or bid with the best expected result. It is a strong, honest opponent, though we do not claim it plays perfectly. The whole search runs in your browser, so nothing is sent to a server. Read how the Bridge AI works →
What bidding system does it use?
A standard SAYC (Standard American Yellow Card) auction, one of the most widely taught systems in the world. It opens five-card majors, uses standard responses and rebids, and bids a natural notrump range rather than any exotic convention. You do not need to learn a new system to follow along — if you know SAYC basics, the AI's bidding will look familiar.
What is the make-probability readout?
The make-probability readout is the share of simulated deals — dealt consistently with the auction and everything played so far — in which the current contract is made. It updates as the play continues. It is not a separate estimate — it comes from the same Monte-Carlo samples the engine uses to choose its own cards and bids.
Is it free? Does it work offline?
This bridge game is completely free, no download, no sign-up. The engine runs client-side, so once loaded the game keeps working without a connection. There are no ads and no account required either. More AI card games: AI Hearts, AI Euchre and AI Texas Hold'em.