A one-off clash of the Australian Guineas and Randwick Guineas has been approved by the Australian Racing Board.

The two 1600-metre Group One races will be held on March 7, 2015, two weeks before the Golden Slipper which has been brought forward, allowing The Championships to be run over the Easter weekend, April 4 and the following Saturday.

ARB chairman Kevin Dixon said although all efforts were made to avoid the clash of the two Guineas races, it wasn't possible.

"A clash of dates in 2015 following the above changes between the Randwick Guineas and Australian Guineas is unavoidable despite the concerted efforts of all involved," Dixon said.

"However, this apparent direct clash is only nominal in effect as the two races in question were to be run only one week apart had no date changes been approved, which most likely would have prevented horses from racing in both events."

The ARB said it took into account that in the past five years, of 133 starters in both races, only six had run in both.

Of those only one, Mosheen, had won or been placed in both races with the filly collecting both in 2012 when they were two weeks apart.

"While in recent times both races have operated independently of each other catering for different pools of horses, we believe that this less than optimal situation should change post-2015 when the drive is to separate the two Guineas to enable maximum participation in both races," Dixon said.

The date changes to the Sydney carnival will now be referred to the Asian Pattern Committee for ratification.