The Scottish Professional Football League Challenge Cup, commonly known as the Scottish League Challenge Cup or Scottish Challenge Cup, and currently known as the SPFL Trust Trophy for sponsorship reasons, is an association football knock-out cup competition run by the Scottish Professional Football League (SPFL). It is recognised as the third most prestigious knockout trophy in Scottish football, after the Scottish Cup and the Scottish League Cup. The competition was first held during the 1990–91 season as the B&Q Centenary Cup to celebrate the 100th anniversary of the formation of the Scottish Football League (SFL). It was intended to be a one-off competition but was continued due to its popularity. It was originally contested by SFL teams below the top level of the Scottish football league system; teams below SPFL level were added in 2011–12, and guest teams from outside Scotland in 2016–17. For the 2019–20 edition there were 58 teams: 30 from the SPFL; the twelve Under-21 teams of the Scottish Premiership clubs; four each from the Highland League and Lowland League; and two guest teams from each of the NIFL Premiership, Cymru Premier League, English National League, and League of Ireland Premier Division up until the 2019–20 season. The first winner of the tournament was Dundee, who defeated Ayr United. Falkirk are the most successful team in the tournament with four wins, most recently in 2012. The current holders are Raith Rovers, who defeated Queen of the South in the 2022 final. Format The Challenge Cup is a knock-out tournament. Within a regionalised format, clubs are paired at random and the first club drawn listed as the home team. The winner of each match progresses to the next round and the loser is eliminated from the tournament. Every match, including the final, is a one-legged tie that lasts 90 minutes plus any additional stoppage time. If no clear winner has been determined after 90 minutes of normal time, 30 minutes of extra time is played. If the score is still level after extra time then the winner is decided by a penalty shoot-out. Beginning with the 2016–17 season, the competition has been expanded to 58 entrants. All Scottish Professional Football League (SPFL) clubs will participate, with the thirty clubs from the Championship, League One and League Two now joined by Under-20 teams from the twelve Premiership clubs. Also participating by invitation will be four teams each from the