wow. this in fact changes a lot of things. as the facts (albeit reported by the German site) present it, the concession seems to have been 1. legal and 2. cordial. if the concession was in fact legal, there must then not be any penalties whatsoever. if the concession was cordial, there must then not be any recriminations about sportsmanship and ethics. For all we know it was a series of (failed) attempts to recoup 70+ IMPs, and in a KO match you don't care if you lose by 1 or 100.