'Keep In Play' refers to Betfair's Keep Bet facility.

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This is a global option available for markets that are turned in play, so if you have the option ticked unmatched bets will be kept when the market turns in play whereas normally they would be cancelled.

If you are betting on a soccer market then note that as long as the 'Keep In Play' bet is submitted before 'In Play' the unmatched bet will survive all subsequent suspensions during the game, however once the market is 'In Play' and you submit a bet using 'Keep In Play' it has no effect and unmatched bets will be cancelled on any suspension.

Please note when a non-runner is removed from a horse racing market it is Betfair’s policy to cancel unmatched offers to lay all other horses in the market if the non-runner has a reduction factor of 2.5% or greater for win markets, or 4.0% or greater for place markets.

In these circumstances offers to lay a horse with the 'Keep In Play' option selected will not be cancelled.

Instead the lay odds offered or requested in place markets will be reduced in proportion with the reduction factors of any non-runner(s) and the same will apply in win markets providing the relevant non-runner has a reduction factor of at least 2.5%. 

Please also note that for horse racing markets reduction factors are not applied to 'keep In Play' bets which are matched in-play.

In the event of a late withdrawal, Betfair reserves the right to remove the runner after completion of the race.

In this case any 'keep In Play' bet placed before the off and matched in-play will remain at the original selected price and will not be adjusted or cancelled as would be the case if the non-runner were removed pre-race.

See also SP In Play