Real Betis (31%). The first match between the two clubs took place on 8 February 1915, with Sevilla winning 4–3. The match was not completed, as high tensions led an aggressive crowd to invade the pitch, forcing the referee to abandon the match. In 1916, the first "Copa Andalucía" was held, this being the first official derby of the Sevilla area. Of the 17 runnings of the cup, Sevilla were victorious 14 times, to Betis' one sole conquest; this included a 22–0 routing after the latter sent their youth team, in 1918. The first time the teams met in league, in "Segunda",
Real Sociedad B División with under-20 graduates of the club's youth system. The Real Sociedad C team must play at least one division below Sanse. Real Sociedad B hold home games at "Instalaciones de Zubieta", which holds 2,500 spectators. Players of both the first and the second teams train in these facilities, with Sanse’s players being nicknamed "Potrillos" ("Colts") as the grounds are located near the city's horse racetrack. Real Sociedad B Real Sociedad de Fútbol B (also known as Sanse) is a Spanish football team based in San Sebastián, in the autonomous community of Basque Country. Founded in 1951, it is the