Gambling terms, explained straight

Advantage Play & Game Integrity

Courtsiding betting

Courtsiding betting means exploiting the delay between live action at a sports venue and when bookmakers update their odds, by placing bets based on information gathered at the event before the market adjusts.

Also called
courtsiding
Applies to
sports betting, especially in-play betting; observed most prominently in tennis
UK legal status
not considered cheating under section 42 of the Gambling Act 2005, but may breach tournament terms 1

Key points

  • A person at the venue observes a point or play before remote feeds show it, then bets or relays the information before odds update.12
  • The value comes from the latency gap between the venue and broadcast or betting systems, which can be several seconds.12
  • The Gambling Commission does not treat courtsiding as an offence of cheating, though it may violate event terms and conditions.1

Where this term is used

Advantage play Courtsiding The broader practice of transmitting or using live-event information for gambling. Advantage play Card counting Tracking dealt cards to gain a statistical edge in blackjack. Advantage play Blackjack card counting A specific card-counting system used in blackjack. Advantage play Matched betting Using free bets and promotions to lock in profit without risk. Advantage play Arbitrage betting Betting on all outcomes of an event to profit regardless of result. Advantage play Hi-lo card counting A simple card-counting system that assigns values +1, 0, and -1 to cards.

Sources

  1. In-play or in-running betting gamblingcommission.gov.uk Provides the UK regulatory position on courtsiding and the definition of the practice.
  2. Courtsiding en.wikipedia.org Supplies the general definition and context for courtsiding betting.

Sources are drawn from regulators, universities and published research, and each one is labelled with what it actually is — a preprint is not called a paper. Bookmaker and affiliate pages are never cited here, because a page that sells betting is not a neutral authority on it.

Written and maintained by Ellis Warrender, writer and maintainer.

Last updated 28 July 2026. Spotted an error? Tell me and it gets fixed and logged on the corrections page.