What Is a Round Robin Bet? How It Works, What It Costs, and When It Beats a Straight Parlay

Updated 19 Oct 2026 · By the BetHubCA Editorial Team

You've got three picks you like for tonight's NHL slate. A straight three-team parlay pays big, but one bad bounce and the whole ticket is dead. Betting them all as singles feels safe but pays like a savings account. A round robin sits in between: it chops your picks into a bunch of smaller parlays, so one loser doesn't automatically sink everything. Let's walk through exactly what a round robin bet is, how the maths works with real numbers in Canadian dollars, and when it's smarter (or dumber) than a regular parlay.

Ground rules: 19+ in most provinces, 18+ in Manitoba and Quebec. This site doesn't serve Ontario or Alberta residents. Cloudbet, linked here, is licensed in Curaçao and is not authorized by any Canadian province. All odds and payouts below are illustrative examples, not live prices or picks.

A round robin in one sentence

A round robin is a set of parlays built from the same list of picks, where you choose the parlay size (pairs, triples, and so on) and the book creates every possible combination at that size for you.

So if you pick three teams and choose "by 2s," the book makes every two-team parlay possible from those three. That's three separate parlays: A+B, A+C and B+C. Each one is its own ticket with its own stake and its own payout.

The key thing to understand: a round robin isn't one bet. It's several bets placed at once. That's where both its strength (survives a loss) and its main trap (costs more than you think) come from.

How many bets are you actually making?

The number of parlays depends on how many picks you have and what size you choose. Here's the cheat sheet:

Look at how fast that grows. Six picks with every combination is 57 separate bets. At C$5 each, that's C$285 on one slip. People click "all combinations" without thinking and get a nasty surprise at the bet slip total.

Worked example: three NHL picks by 2s

Say you like three teams on the moneyline tonight. Illustrative prices:

You play a round robin by 2s at C$10 per parlay. That's three parlays, so C$30 total. Here's what each parlay pays if it wins:

Now the part that matters. What happens for every possible result?

Two out of three still makes money here. That's the whole selling point.

Same picks as a straight parlay

Now put that same C$30 on a single three-team parlay. The combined odds are 1.80 × 2.00 × 2.20 = 7.92.

That's the trade-off in plain view. The parlay pays more than double when everything hits. The round robin gives up that ceiling so a two-of-three night still ends in the green. Neither is "better" in general. It depends on whether you'd rather swing for the fences or smooth out your nights.

Adding the triple: by 2s and 3s

Most books let you tick more than one size. With three picks, "by 2s and 3s" gives you the three doubles plus the one triple: four bets. At C$10 each, that's C$40.

• All three win: C$119.60 from the doubles plus C$79.20 from the triple (C$10 × 7.92) = C$198.80 back, +C$158.80 profit.
• Two of three win: one double hits (C$36 to C$44 back), the triple loses. Net −C$4 to +C$4.
• One or none: −C$40.

Adding the triple raises the ceiling but makes the two-of-three night roughly break-even instead of a small win. Every extra combination is more money in play, so each "safety" layer you add costs you on the other results.

The British names you'll see on some books

Some sportsbooks, especially ones with a UK or Irish background, use named full-cover bets. They're round robins with a fixed recipe:

Yes, there's a bet literally called a "Canadian." It's five picks with every combination from doubles up, which is 26 bets. Fun name, real cost. At C$2 per bet, it's C$52 on one slip.

The stake trap: per bet vs total

This is the number one round robin mistake. Most bet slips ask for a stake per combination, not a total. You type C$10 thinking you're betting ten bucks, and the slip shows C$60 because you had four picks by 2s (six parlays).

Before you confirm, always look at the total at the bottom of the slip. If you've set a budget of C$20 for the night and you want six parlays, your per-bet stake is about C$3.33, not C$20. Some books let you enter a total and split it automatically, but don't assume it. Check every time.

Round robins and the book's margin

Here's the honest maths. Every leg of a parlay carries the book's margin, and in a parlay those margins multiply.

Take a typical two-way line at 1.91 on both sides. Implied probabilities add to about 104.7%, so the book's edge is roughly 4.5% on a single bet. If the game is truly a coin flip, you get back about 95.5 cents per dollar on average.

A round robin by 2s is really just several two-leg parlays, so its average cost sits around the two-leg row. It's cheaper per dollar than a big parlay, but more expensive than singles. If you don't have an actual edge on your picks, round robins don't fix that. They just change the shape of your results.

When could a round robin make sense? If you honestly believe each pick is priced better than its true chance (you think a 2.00 team actually wins more than half the time), combining them multiplies that edge too. That's the real case for parlays and round robins. Being confident isn't the same as having an edge, though, so keep stakes small until your records show it.

What happens if a game is postponed or voided?

Rules vary by book, so check the house rules before you play. Typically, when a leg is voided (postponed, cancelled, or a pitcher change on certain baseball bets), that leg is removed and each parlay that contained it gets shorter.

In our three-pick example by 2s, if Team B's game is postponed:

• A+B becomes a single on A.
• B+C becomes a single on C.
• A+C stays a two-team parlay.

Your payouts shrink, but you're not knocked out. On some books, a void in a two-leg parlay can make that ticket stand as a single or refund it depending on the rules. Read the settlement section, especially for hockey, where regulation-time markets and moneylines settle differently. Our page on whether NHL bets include overtime spells that out.

Picking the right size for your round robin

A handy rule: with four picks by 3s (four parlays), any single loser still leaves you one winning triple. That's a nice middle ground between a straight four-team parlay and a pile of doubles.

Round robins on Canadian sports

• NHL: Moneylines are tight and upsets are common, which is exactly why people like round robins here. One goalie standing on his head shouldn't kill your whole night. See how the NHL puck line works if you want bigger prices per leg.
• CFL: Smaller weekly slates (usually four games or fewer) keep round robins compact. A four-game week by 2s or 3s is easy to manage. Check how to read CFL odds this week.
• MLB: Long seasons and lots of games make baseball a classic round robin sport. Pitcher-listed bets can void if the starter changes, so read the rules. Our Blue Jays betting guide covers the basics.
• NBA: Favourites are often short odds, so a round robin of big favourites pays very little. Mixing in spreads or a couple of fair-priced dogs gives each leg more value. See how to bet on Raptors games.

Round robin vs hedging a parlay

Some people use a round robin as built-in insurance instead of hedging later. It's a different approach: the round robin protects you from the start, while a hedge adjusts after you know some results. If you're curious about locking in profit once most legs have won, read hedging bets explained. Both cost you something. The round robin costs you ceiling upfront, and the hedge costs you a second margin later.

Common mistakes

• Not checking the slip total. Per-bet stakes multiply fast.
• Using correlated legs. Many books won't allow legs from the same game in a round robin, and some limit related markets.
• Stacking heavy favourites. Three teams at 1.30 by 2s pay 1.69 per parlay. That's a lot of risk for very little reward.
• Going "all combinations" on six or more picks. The bet count explodes, and so does the margin you pay.
• Treating it like a sure thing. Two losses in a three-pick round robin still means losing everything.

How to place one, step by step

1. Add your picks to the bet slip (at least three).
2. Switch from "single" or "parlay" to the round robin or "system" option. Some books call it a system bet.
3. Pick the size: by 2s, by 3s, or several sizes.
4. Enter your stake per combination and check the total.
5. Review the max payout, then confirm.
6. Track it in a notebook or spreadsheet with the result, so you learn what actually works for you.

Want to preview payouts before you place anything? Plug each combination into our parlay calculator or convert American odds with the odds calculator.

Is it legal for me to place a round robin?

Round robins are just a bet type, so the same rules apply as any other online bet. Provincial sites (PlayNow in BC, Manitoba and Saskatchewan, Loto-Québec, and the Atlantic provinces' products) are the regulated path where they're offered. Offshore books like Cloudbet aren't authorized by any province. Our page on whether online betting is legal in Canada covers the details honestly.

Keep it in check

Because round robins put many bets on one slip, they can burn through a budget faster than people expect. Set a nightly limit before you open the app. If you notice you're chasing losses with bigger round robins, stop and take a break. Free, confidential help is listed on our responsible gambling page, including Gambling Support BC at 1-888-795-6111.

My take

A round robin is a parlay with a seatbelt. It won't make bad picks good, and it costs you some of the big payday, but it turns "so close" nights into small wins instead of total losses. Start with three or four picks by 2s, keep your per-bet stake small, always check the slip total, and track your results. If after a few months your records show your picks are beating the prices, then you can think about bigger sizes. Until then, keep it fun.