 Complete the following phrase:  After Celtic won the 1967 European Cup Final, the home leg of their Intercontinental Cup tie against Racing Club was held at Hampden. Celtic won 10 at Hampden, but lost the tie after a play-off in Montevideo. In 1970, Celtic played in the semi-finals of the European Cup against English league champions, Leeds United. Celtic chose to move their home leg of the tie from their Celtic Park home to Hampden, which had a far greater capacity. A crowd of 136,505, a record for any match in UEFA competition, saw Celtic win 21 31 on aggregate to advance to the 