CHICAGO - From Reno Rumble to Mystery Giver, and now Fort Prado, the lineage of excellent Illinois-bred grass horses trained by Chris Block grows longer by the year, and 3-year-old Creative Force might be next. A solid turf allowance win May 20 at Arlington earned Creative Force a starting berth in the Arlington Classic on Saturday, and the race will tell Block whether he has another Illinois-bred worthy of open stakes competition.