Goals within five minutes either side of half-time saw YM move level with Railway Union in seventh after their 2-0 win at Park Avenue.
Railway hit the post inside three minutes but did not create many major chances after that moment. David Robinson opened the scoring from a penalty-corner drag-flick and Andy Walker got the second from play soon after the half-time break before Railway were shown a red card for continued, vehement complaints toward an umpire.
The result, if any doubts remained, dispels any worry of relegation with nine points now separating the pair from UCD and Kilkenny who look certain to fill the relegation and playoff places.
UCD 0 Corinthian 9 (Brian Doherty 2, John McInroy, Darren Kimfley, Rowland Rixon-Fuller, Davy Carson, Andrew Cronje, Sam Lobsey, Miles Warren)
The reds thumped UCD to move into the top four for the first time, leaping over Monkstown and Fingal, taking advantage of their IHL concerns.
Teenager Brian Doherty added a brace to his season's tally while the rest of the goals were spread around the side with St Andrews' student Davy Carson scoring a nice effort while the foreign contingent all getting involved. South Africans Kimfley, Cronje, McInroy and Warren, Zimbabwean Rixon-Fuller and Australian Lobsey were all on the score sheet.