See Betfair announcement. Looks like they are planning to go live tomorrow on all racing: –<\/p>\n
“Following a previous trial earlier this year, we are now running another trial of in-play cross-selection matching (\u2018cross-matching\u2019) on the win markets at Lingfield Park on Tuesday 23rd November. Cross-matching will only be activated after the markets are turned in-play.<\/p>\n
Cross-matching was introduced on most sports during 2008 and has had a significant, positive impact on liquidity. It has meant that a customer\u2019s bet is more likely to be matched than would have been the case without cross-matching. When a bet request cannot be matched by an opposing bet on the same selection, cross-matching will attempt to match the bet request with unmatched liquidity on the remaining selections in the market. Cross-matching incorporates \u2018best execution\u2019 meaning that whenever the bet matching algorithm can match a bet request at a better price than requested, it will do so, resulting in the customer making the bet request getting the best possible price.<\/p>\n
We don\u2019t expect customers to notice any material difference in the way the win markets operate at Lingfield Park.”<\/p><\/div>\n