Series leader Carlos Checa says he cannot make any predictions ahead of race day for the third round of the 2012 World Superbike Championship at Assen following another day of tricky conditions.

Changeable weather throughout the weekend thus far has wreaked havoc on riders attempting to get a good base setting in either the dry or wet, including the Althea Ducati rider.

As such, though Superpole itself was dry, Checa could only turn in a time good enough for fifth on the grid, marking the first time he has started off the front row in twelve meetings.

Indeed, Checa feels it is difficult to know how the two races will unfold, insisting the weather could prove the determining factor.

"This weekend has been, let's say, different to many others, in that we've seen almost everything from a weather point of view, and such variable conditions have prevented us from working well, as it's not been really dry or really wet for any length of time.

"In these conditions it's also difficult with only one bike, as we can no longer set up one for the dry and the other for the wet, and so we lose time. I can't make any guesses for the races, the only thing I can say with certainty is that everything is entirely unpredictable here at Assen!"