What is Chicago bridge?

Chicago bridge, also called four-deal bridge, is rubber bridge played in fixed sets of four hands. The auction and the play are unchanged. Two things differ: vulnerability follows a set schedule rather than being earned, and a game pays its bonus straight away instead of counting toward a rubber bonus. A set takes twenty to thirty minutes, and then the score resets.

Rubber bridge has one structural flaw at a home table, and it has nothing to do with the cards. You cannot tell how long a rubber will take. Two brisk games and you are finished in forty minutes. A run of stubborn partscore skirmishes and the same rubber is still crawling along at half past eleven while one couple keeps glancing at the coats.

Chicago fixes that. Four deals, settle up, move on. It is probably the most useful home format that most casual players have never tried.

The vulnerability cycle

The standard vulnerability cycle goes like this:

  • Deal 1: neither side vulnerable
  • Deals 2 and 3: the dealer's side vulnerable, the other side not
  • Deal 4: both sides vulnerable

The deal rotates clockwise, so everyone gets one turn as dealer per set. Plenty of home groups use a simpler homemade version instead (none, then North-South, then East-West, then both). That works fine. Just agree on it before the first card hits the table, because arguing about vulnerability retroactively is how friendly games turn sour.

If the colours have always felt like bookkeeping rather than something that should change your bidding, it is worth being clear on what vulnerability really means before you play a set, because Chicago puts all four states in front of you inside twenty minutes.

How the scoring differs from rubber

Bid and make a game and you collect 300 not vulnerable, 500 vulnerable, right then. No waiting around for a second game. Slam bonuses, doubled penalties, and trick scores all behave exactly as they do in rubber bridge, so if you can score a rubber you can already score Chicago. Worth knowing if you learned the game on rubber scoring and assumed the two systems were further apart than they are.

Partscores carry over the same way: 60 on one deal plus 60 on the next completes a game, and a game by either side wipes out both sides' partial progress toward the next one. The wrinkle is the ending. Make a partscore on the fourth deal that does not complete a game and you collect a flat 100 bonus for it. A partscore left over from earlier in the set earns nothing extra under the standard rules; it simply vanishes when the slate is wiped clean. Some home groups pay the 100 for any leftover partscore, which is a harmless house rule as long as everyone knows about it. A passed-out deal gets redealt by the same dealer with vulnerability unchanged.

That endgame rule shapes the fourth hand more than people expect. Both sides vulnerable, a partscore worth a certain 100 rather than a promise of something later, and no fifth deal coming along to bail anyone out. The last hand of a Chicago set has a genuinely different flavour from the first.

A sample Chicago set, scored

Here is how four deals might go, with North dealing first.

  • Deal 1 (nobody vulnerable): North-South bid 2♠ and make three. That is 90 on the sheet, and 60 of it counts toward game.
  • Deal 2 (East dealing, East-West vulnerable): East-West bid and make 3NT. 100 for the tricks plus 500 for a vulnerable game, so 600. North-South keep their 90 on the sheet, but their 60 no longer counts toward a game.
  • Deal 3 (South dealing, North-South vulnerable): North-South stretch to 4♥, get doubled and go one down. 200 to East-West.
  • Deal 4 (West dealing, both vulnerable): North-South play 2♦ and make it exactly. 40 for the tricks plus the 100 fourth-deal bonus, so 140.

Add it up and East-West win the set 800 to 230. Look at what deal 2 really cost North-South, though. If their 60 from deal 1 had survived, that same quiet 2♦ at the end would have completed a vulnerable game and been worth 540 instead of 140. Chicago packs swings like that into twenty minutes.

Why it plays better than rubber at home

Vulnerability variety is the underrated part. A rubber can run its whole length with one side never vulnerable, which quietly removes half the interesting decisions from the evening. Chicago forces all four vulnerability states into four deals. Suddenly you are making real judgments: the thin vulnerable game try, the cheap non-vulnerable sacrifice, the competitive partscore push where the colours actually matter.

Then there is the clock. Four deals is a known quantity, roughly twenty to thirty minutes, which makes rotation trivial. Want to change partners every set? Easy. Want to stop at a sensible hour without abandoning a half-finished rubber? Also easy. Groups that struggle to decide how long an evening should run usually find the problem solves itself once the format has a natural stopping point every four hands.

It also kills the death spiral where one pair racks up an enormous rubber and the other spends ninety minutes losing slowly. Bad luck in Chicago lasts four deals. Then it resets.

What Chicago still does not fix

At the end of a set you have a number. Plus 620. Minus 100. Whatever the pencil says.

What you do not have is any sense of whether that number was good.

Plus 140 in three hearts might be a small triumph or a quiet catastrophe, and nothing at your table can tell you which. Maybe the hand was cold for four. Maybe everyone else went down. Your own result, sitting there alone on the score pad, is unreadable. That is not a flaw in Chicago specifically; every home format shares it, which is exactly why most home scoring methods feel a bit hollow after a while.

The fix is comparison, and comparison needs other people playing the same cards. That is the idea Bridge@Home is built on: your four players sit at your own table with pre-dealt hands, and afterwards you see how everyone else who held those same cards actually did. Plus 140 stops being a mystery number and starts being an answer.

Try it next time

Print the vulnerability cycle on an index card, stick it in the middle of the table, and play four deals. Score it like a rubber, pay the game bonuses on the spot, and see whether the evening feels tighter.

My guess is the fourth hand of the first set will be the most interesting hand you play all night.