regarded by Ajax supporters as the club's "little brother". With AZ being from nearby Alkmaar and therefore situated in the same province as Ajax, match-ups between the two sides are commonly known as the "De Noord-Hollandse Derby" ("North Holland Derby") and are often very competitive, intense and loaded fixtures. Past rivalries include local Amsterdam derbies between Ajax and clubs such as Blauw-Wit, DWS and De Volewijckers (which later merged to become FC Amsterdam in 1972). However, the tension between the local sides lessened as the division of the clubs through playing in different leagues over time became greater. Years of not competing in the same league resulted in less frequent match-ups, until tensions finally settled between the Amsterdam clubs. The last Amsterdam derby to take place in an official league match was when Ajax defeated FC Amsterdam 5–1 on 19 March 1978. Supporters Ajax are known for having fanatic core supporter-groups, of which F-Side and VAK410 are the most famous. F-Side were founded on 3 October 1976, and are situated right behind the goal in the Johan Cruyff Arena, on the southern end of the stadium in rows 125–129. Their name is derived from the group's former location on the F-side of the old De Meer Stadion. The F-side supporters are responsible for a big part of the atmosphere in the stadium, but are also known for rioting during and after matches. If in any match Ajax should win the coin toss, the second half of the match Ajax always play towards the south-end of the stadium. VAK410 (English: Row 410) were founded in 2001 and are situated in the Zuidhoek (South corner) of the stadium on the upper ring in rows 424–425. The group was originally situated on the North-West side of the stadium in row 410, from where it derives its name, until relocating to their current place in the stands in 2008. Members of VAK410 are known to perform various stunts, which include massive banners, to enhance the atmosphere in the stadium. Neither F-Side or VAK410 have seats in their sections of the stadium, and both groups stand for the duration of the match. Through the official Football Top 20 of Dutch sports research group SPORT+MARKT, it was revealed in 2010 that Ajax had approximately 7.1 million supporters throughout Europe. This is significantly more than rivals Feyenoord and PSV (each 1.6 and 1.3 million, respectively), which puts