John Higgins moved a step closer to snooker history as he battled his way past Neil Robertson in the World Championship quarter-finals, leaving himself one victory away from becoming the oldest ever world finalist. The 50-year-old will be the oldest semi-finalist since 52-year-old Ray Reardon in 1985 when he faces Shaun Murphy in the last four, beginning on Thursday afternoon , and a fifth world title is becoming a genuine possibility for the Scot. Higgins trailed 2010 champion Robertson 9-7 heading into the final session but quickly eradicated that deficit with breaks of 66 and 77 before responding to the Australian’s run of 73 with two more frames to lead for the first time at 11-10. (PA) The frames were generally long and arduous but a trademark Higgins counter-clearance saw him snatch frame 22 by a point to move within one of victory before finally getting over the line in the next, just after 11pm, to triumph 13-10.…