The question is sometimes asked whether correspondence players need to prepare openings. The answer is yes and no. Under the standard ICCF time control of 10 in 50 it is possible to prepare just about any opening while play is ongoing. Nevertheless, there's no substitute for being intimately familar with an opening's nuances. Guiding the game into promising opening lines is more critical in correspondence than in OTB.
Jason Bokar is one of America's few correspondence Grandmasters. He demonstrates why in this game. Jason is playing in the final of the 24th Correspondence World Championship. Crosstable.