Mark Allen reaches last four at The Crucible with hard-fought win over Jak Jones

Mark Allen celebrates beat Jak Jones to reach the semi-finals of the Cazoo World Snooker Championship in Sheffield (Zac Goodwin/PA)

Mark Allen reached the semi-finals of the World Championship for just the second time in his career with a hard-fought win over qualifier Jak Jones.

Allen was far from his fluent best and made just one break over 70, but took advantage of a nervy display in the final session from debutant Jones to secure a 13-10 victory.