Sit start and sink some great hand jams up to the lip of the boulder, seems easy enough right? Get one last hand jam before the crack widens and reach way up right to some good pockets on the side of the crack. Jam a foot deep in the crack so if you fall it will be sure to hold and flip you upside down. As for your other foot, locate the best foothold outside of the crack to help you top out. This happens to be a nice sandy/mossy smear, fantastic. Put all of your trust in these feet as you use the pockets to struggle your way over the lip of the boulder to some sandy slopers.