The UEFA European Under-17 Championship consists of three distinct stages: the qualifying round, the elite round and the final tournament. The format changed for 2014/15 with the expansion of the final tournament from eight to 16 teams.
The qualifying round, played in autumn, is made up of 13 groups of four countries playing in one-venue mini-tournaments. The top two from each pool progress alongside the four third-placed sides with the best record against the leading pair in their groups.
In the elite round, held in early spring, those 30 qualifiers plus the top two seeds – given a bye this far – compete in eight mini-tournament groups of four. The group winners and seven runners-up with the best record against the teams first and third in their section advance to the finals to join the hosts.
In the final tournament the contenders are split into four groups of four, with the front two from each proceeding to the knockout phase.
Further details, including the criteria for separating sides that finish level on points in a group, or after 80 minutes in a match, can be found in the official competition regulations.
Turkey ensured they ended the FIFA U-17 World Championship group stage in Peru with maximum points as they came from behind to defeat Mexico 2-1.
A similar turnaround victory against Uruguay had ensured the European champions' progress from Group B to the quarter-finals with a match to spare, but they went into the fixture with Mexico in Piura needing three points against another team with a perfect record to finish top of the pool.
With both teams resting key players - Turkey coach Abdullah Avci making seven changes to the starting lineup - Mexico struck first when Ever Guzman found the target eleven minutes in. Turkey came back strongly and not long after Nuri Sahin volleyed over, the BV Borussia Dortmund midfielder's 28th-minute shot was only parried by Mexico goalkeeper Sergio Arias and Deniz Yilmaz was first to the rebound and equalised.
In the second half a succession of chances for Turkey went begging, but just as it seemed as though they would have to settle for a draw, Caner Erkin headed a 91st-minute winner. The coach said: "The first 15 minutes were difficult for us, but we were the ones who were able to put more pressure on Mexico and I think we played the better football."
Third place in the group was clinched by Australia, who defeated Uruguay 2-1, while Turkey then discovered their quarter-final opponents in Iquitos on Sunday would be China, who gained the draw they needed to progress from Group A, ending 1-1 against Ghana. First place in the pool on goal difference went to Costa Rica, who ended the campaign of hosts Peru with a 2-0 win and play Mexico in Piura.
If the Netherlands or Italy want to join Turkey in the last eight, they both need positive results on Friday. The Azzurrini must beat the Democratic People's Republic of Korea - for who a draw would be enough - in Group C Trujillo while the already-qualified United States take on eliminated Ivory Coast. In Group D, the Dutch play a Gambia side on maximum points in Lima, and will need to win if holders Brazil defeat bottom side Qatar.
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