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
Parapsychology? That’s a bunch of bananas. Korchnoi believes in that. He is still playing his game with the ghost of Geza Maroczy.
Nathan Divinsky 2004
Kasparov’s book are the best, as far as high level analyses are concerned.
Jan Timman 1991 NIC
Chess is a game by its form, an art by its content and a science by the difficulty of gaining mastery in it. Chess can convey as much happiness as a good book or work of music can. However, it is necessary to learn to play well and only afterwards will one experience real delight.
Tigran Petrosian
The competition in the men’s tournament has grown massively over the past 20 years. Chess is becoming more and more popular, and there are no weak teams in the tournament any longer.
Andrey Filatov
My style is based on giving energy and creating. Karpov’s style is something that is probably taking energy from his opponent. NIC 1989
Garry Kasparov 1989 NIC