The interference of one black piece by another like moving one on the same line (if the pieces are on different lines, it is a Holzhausen).
ECHESSPEDIA
Quotes of the Day
I still think people can learn at any age – I’m actually sure about that. It’s just that the ceiling is lower for how far you want to go.
Magnus Carlsen 2016
Karpov is the official World Champion, but I’m not sure what that really means.
Jan Timman 1993
I may be an old lion, but I can still bite someone’s hand off if he puts it in my mouth
Wilhelm Steinitz
I personally believe that Karpov should have been more generous with Kirsan Ilyumzhinov. Kirsan is the only president in the history of FIDE, and maybe in the history of all international federations, who has contributed dozens of million dollars for the sport he loves. By the way, some of these millions went directly to Anatoly’s pocket…
George Makropoulos 2005
it would have been a debacle if Karjakin had become the 17th World Champion.
Garry Kasparov 2016