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
It isn’t important what comes off the board, but what stays on!
Yasser Seirawan
When I see the Berlin defence, I am almost happy that I am not longer a top player!
Nigel Short 2016
There is no room for gallantry in chess.
Irving Chernev
Looks like I’m going to raise the average age of the field and lower the average rating!
Garry Kasparov 2017
Karpov, Kasparov, Korchnoi have absolutely destroyed chess by their immoral, unethical, prearranged games. These guys are really the lowest dogs around, and if people knew the truth about them, they would be held in more contempt than Ben Johnson, the runner, and they’re going to know the truth when I do this book!
Robert Fischer September, 1 1992