we ll look ahead to what could be a defining week at the top of the table. after protesters disrupted the world snooker championship, we ll tell you how security s being stepped up at the crucible. i ll be very surprised if the protocols that were in place at the crucible yesterday are in place today. also coming up on sportsday before 7. how a special piece of kit s transforming how one woman s competing at this year s london marathon. we start tonight with the mountain chelsea have to climb if they re to salvage anything from this season. 2 0 down from the first leg, they need at least three goals against real madrid to remain in the champions league. a change of owner, half a billion pounds spent, yet another manager. nothing s transformed chelsea s fortunes so far as patrick geary reports. and so to chelsea s at last remaining bridge, the final road forward in a season of missed earnings runs through real madrid at stamford bridge but they have made things hard for themse