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 detest the endgame. A well-played game should be practically decided in the middle-game!
David Janowski
What’s been bothering me is not that I haven’t won tournaments, but that I haven’t played very well.
Magnus Carlsen 2017
Chess politic is not my dream, but I will be happy when we start to change things and organize a better chess life in the world.
Anatoly Karpov 2010
When I am White I win because I am White. When I am Black I win because I am Bogoljubov.
Efim Bogoljubov
Chess is a scientific game and its literature ought to be placed on the basis of the strictest truthfulness, which is the foundation of all scientific research.
W. Steinitz