Corner (Square) Bet

A Corner Bet is an Inside Bet (like the Six Line Bet) on 4 numbers which pays out pays 8 to 1. You place your chip at the corner of four numbers (or in the middle of a square of four numbers). This bet is also called a Square Bet or a Quad Bet or even Carré in French Roulette. The house edge is the same as playing a single number bet. You have a 1:9.25 chance of winning the bet at a payout of 8:1.

A closely related bet is the Four Number bet which has the same payout, but includes the zero.

split bet roulette

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For example, above, we have 2 corner bets- one on 7.8.10.11 and one on 17,18,20,21.

Win Probability
If you place one corner bet on European Roulette, you have a 4:37 chance of winning (10.8%)
If you play American Roulette, your odds are 4:38 (1:19) for each square bet or 10.5%).

House Edge
The House Advantage on this bet is the same as the other main roulette bets: 5.26% for American Roulette ("0" + "00" pockets) and 2.63% in European Roulette. 

Roulette Strategies that Use the Corner Bet
There are plenty of systems that employ this Inside Bet- one is the 5 Quad Strategy, where you make 5 corner bets plus a single straight up bet (table coverage 21/37 on a Euro wheel, or 57%), or  54% if you use a number for your single number bet that is already covered by your corner bets).

So, it's a 6 chip bet. You'll make 3 chips if one of the corner bet numbers drops in and 30 chips if you land on the single number bet. It's a kind of hedge system on the single number bet, a "grind out the profit" typs of strategy.

Some of the more advanced Call Bets that you can play on the more premium variants use corner bets- the Number Combo is a good example. Another is the Complete Bet where you play all the possible inside bets of an individual number (including the Square or Corner Bet.

The Best Casino and Variant for The Corner Bet?

This is a standard bet like the Split Bet so it's best play on a European wheel- the odds are higher. Even more preferable is French Roulettethat plays "la Partage". Try the Premium French Roulette over at Ladbrokes Casino.