Your browser does not support iframes\r\nETOBICOKE, Ontario &ndash; Fifty Proof will go back to the grass in Saturday&rsquo;s $250,000 King Edward Stakes at Woodbine, following an encouraging Polytrack victory.\r\nFifty Proof was campaigned as a turf specialist last year, finishing second in the Grade 1 Northern Dancer Turf and fifth in the Grade 1 Canadian International.\r\nTrainer Ian Black ran Fifty Proof twice on the Polytrack here this spring. After a winter vacation, he was a workmanlike winner in a seven-furlong optional claimer April 22. Five weeks later, he won his first stakes going 1 1/16 miles in the Grade 3 Eclipse.\r\nBlack said this move back to a mile on the grass is something of an experiment for the imposing Fifty Proof.\r\n&ldquo;We want to try him back on the turf, to see where we fit distance wise,&rdquo; Black explained. &ldquo;He has a lot of natural speed. This might be shorter than his best, but I still think that he&rsquo;ll run a creditable race.&rdquo;\r\nGrand Adventure captured last year&rsquo;s King Edward over a stellar field that included Rahy&rsquo;s Attorney, earning a fat 105 Beyer Speed Figure.\r\nFollowing a half-length loss in his season debut in the Grade 3 Shakertown at Keeneland, Grand Adventure tried to win the Grade 2 Connaught Cup Stakes for the second year in a row here May 29. Sent off as the 2-5 favorite, he could only manage to finish third over the boggy going.\r\n&ldquo;It was too soft for him, I guess,&rdquo; trainer Mark Frostad said. &ldquo;It was pretty heavy, and he&rsquo;s big, heavy horse himself. He didn&rsquo;t float over it like some of the others did.&rdquo;\r\nTrainer Mark Casse entered Hailstone and Silver Rock in the Grade 2 King Edward.\r\nHailstone rallied in the final furlong of the Connaught to finish three lengths behind the front-running Stormy Lord in second.\r\nSilver Rock is riding the wave of a three-race win streak that began with a maiden score in February at Gulfstream. He subsequently won a first-level allowance at Keeneland and a second-level allowance at Churchill.\r\nArlington-based Workin for Hops prevailed as the favorite in the Grade 3 Hanshin Handicap on Polytrack on May 21.\r\nSociety&rsquo;s Chairman is coming off a third in the Grade 1 Maker&rsquo;s Mark Mile at Keeneland. His best placing in three starts in the King Edward was a fourth in 2009.\r\nCourt of the Realm has won three straight allowances on Polytrack leading up to this his stakes debut.