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President Recep Tayyip Erdogan has launched his ruling party's bid to stay in power, as he seeks to extend his leadership of Turkey beyond 20 years.
He is facing his stiffest challenge yet from six opposition parties who have combined forces for presidential and parliamentary elections on 14 May.
Turkey faces soaring inflation and is reeling from twin earthquakes that have left 50,000 people dead. Mr Erdogan and his ruling AK Party say they will bring inflation down to single figures, a commitment already made by their opponents.
Turkey has become increasingly authoritarian under President Erdogan and the opposition is seeking to reverse that.
Any candidate that can secure more than half the presidential vote on 14 May is the outright winner. Failing that, the race goes to a run-off two weeks later.
Whichever party wins the parliamentary vote is seen as having a psychological advantage if the presidential election goes to a second round.
Erdogan's challenge
Turkey's voters have been polarised for years, but Mr Erdogan, 69, is under pressure as never before. Turkey has become increasingly authoritarian under its current leader, who runs Turkey from a vast palace with much of the media controlled by his allies.
He has ruled Turkey since 2003, initially as prime minister but then as president since 2014, dramatically increasing his powers three years later after a failed 2016 coup. His AK Party has been in power since November 2002.
Increasing numbers of Turks have blamed him for soaring inflation, because of his unorthodox refusal to raise interest rates. The official inflation rate is just above 50%, but academics say it is actually higher than 100%.
Turkey's president and ruling party have also been widely criticised for failing to adapt Turkey's construction practices before the 6 February earthquakes and for mishandling the search and rescue efforts afterwards.
Millions of Turks were left homeless in the 11 provinces affected by the quakes. Since many of them are seen as Erdogan party strongholds, the election could be won and lost in the east.
His AK Party is rooted in political Islam, but he has forged an alliance with the ultra-nationalist MHP.
Six opposition parties - one candidate
Kemal Kilicdaroglu, 74, comes across as a mild-mannered, bookish opponent and he has presided over a string of election defeats at the helm of the main opposition Republican People's Party (CHP).
But this time could be different as he is fighting as a unity candidate for six opposition parties, ranging from his own centre-left party and the nationalist Good party to four smaller groups, which include two former Erdogan allies one of whom co-founded the AK Party.
Mr Kilicdaroglu also has the unofficial backing of Turkey's pro-Kurdish HDP, which is running for parliament under the banner of another party, the Green Left, because of a court case alleging links to Kurdish militants.
His selection was not universally popular, because some considered the mayors of Istanbul and Ankara as better candidates after they took control of the cities in 2019 for the CHP for the first time since 1994.
A former civil servant who is part of the Alevi minority, Mr Kilicdaroglu led a 24-day march for justice in 2017 which was seen as the biggest show of defiance against President Erdogan's rule for years.
His Nation's Alliance, also known as the Table of Six, are united in their desire to return Turkey from the presidential system created under Mr Erdogan to one led by parliament. To change the system, they need to win 400 of Turkey's 600 MPs, or 360 MPs to take a proposal to a referendum.
The leaders of the other five members of the alliance have agreed to take on the roles of vice-president.
Splitting the vote
Turkish opinion polls are notoriously unreliable, but any chance Mr Kilicdaroglu had of winning the election outright in the first round appears to have been dashed by the decision of a former centre-left party colleague, Muharrem Ince, to join the presidential race.
Mr Ince, 58, was the Republican People's Party presidential candidate in 2018, but left two years later because of differences with Kemal Kilicdaroglu, He now runs the secular nationalist Homeland Party and has faced accusations of diluting the opposition vote and playing into President Erdogan's hands.
But he has a strong presence on social media and young voters in particular have been impressed by his dance moves on TikTok.
One other candidate with little chance of significant success is ultra-nationalist Sinan Ogan, but he too has the potential to be a kingmaker.
How does the vote work?
To enter the 600-seat parliament, a party needs to attract 7% of the vote or be part of an alliance that does. That is why alliances have become so important in Turkey, and the six-party opposition have highlighted changing that as one of their proposed reforms.
Turks vote for party lists rather than candidates under proportional representation, so seat numbers correspond to votes cast per party rather than alliances. In some seats, the opposition has agreed to fight under one party banner.
Candidates running for the Green Left instead of the pro-Kurdish party are part of the Labour and Freedom Alliance.
Under the Erdogan reforms, it is now the president who chooses the government, so there is no prime minister. And if his broad People's Alliance fails to win a majority in parliament, he may struggle to rule in the same way as now. The pro-Erdogan People's Alliance currently has 334 MPs.
How would the opposition change Turkey?
The Kilicdaroglu-led Nation's Alliance alliance wants to restore Turkey's parliamentary system and reform the presidency, removing the head of state's right to veto legislation, cutting the post's ties to political parties and making it electable every seven years.
The six parties also want to kickstart Turkey's decades-long bid to join the European Union and restore "mutual trust" with the US, after years of fractious relations during the Erdogan years.
They have pledged to bring inflation below 10% within two years and send Syrian refugees home voluntarily. Turkey currently hosts some 3.6 million Syrian refugees.