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
When I am in the USSR, I have the feeling that every tram conductor plays chess better than I do.
Hans Ree
A good sacrifice is one that is not necessarily sound but leaves your opponent dazed and confused.
Rudolf Spielmann
Carlsen is paying far less attention to opening theory than his rivals, he is happy to go down paths that may offer no advantage yet have the benefit of dragging opponents out of their “openings book”. Once beyond the reaches of computer-aided openings, Carlsen starts to turn the screw.
Judith Polgar FT, 2014
Garry has done a lot over the chess board – unbelievable things. He is the greatest world champion in the chess history. The question is what he has done for the federations, what he has done for his own federation.
Georgios Makropoulos 2013
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