Reading an article (in Dutch) by IM Herman Grooten today,
www.schaaksite.nl/2017/12/10/gespot-87-schaken-is-soms-een-wrede-sport/ He writes about GM Donner watching Boris Ivkov about to play a terrible blunder, the only losing move in a won position, which will cost Ivkov the first place in a tourney.
Herman Grooten gives another example, where black offers a draw, and the white player asks the black player to first make a move. See here what happened :
www.schaaksite.nl/2017/12/10/gespot-87-schaken-is-soms-een-wrede-sport/ He writes about GM Donner watching Boris Ivkov about to play a terrible blunder, the only losing move in a won position, which will cost Ivkov the first place in a tourney.
Herman Grooten gives another example, where black offers a draw, and the white player asks the black player to first make a move. See here what happened :