Are you talking about the new opposition party or about others?
I think the opposition doesn't have much chance to challenge Erdogan, especially the main opposition party, which is in disarray. There are too many factions within the party. They don't have the media coverage, they don't have the grassroots organization, and they don't have the financial resources to be able to make a campaign and to reach out to the people, especially those in rural areas.
The start-up opposition party, which is called Iyi Party or Good Party, is run by a nationalist lady. She didn't have enough time to get this party off the ground and she doesn't have any financial resources or organizational capability. That's one of the reasons Erdogan called the snap polls, to not provide her with an opportunity to organize her party or for others to make any alliances before the election.
I don't see any chance of free and fair elections in the snap polls, because even if, let's say, the people voted for the opposition, at the end of the day it will be up to the election commission, which is comprised of the judges, to decide and certify the election results. All of the judges are in the pockets of the Erdogan government. If they do not comply with his request, they will be accused of terrorism charges and will be thrown into jail.
The bottom line is that the election commission that will be conducting the election and certifying the results is completely on the side of the government.