Glossary of Chess Problems - I

I

Ideal mate

A pure mate in which all units of both colours take part in the mate.

Interference

The closure of the line of one piece by a second piece, thus limiting its movement and cutting it off from certain squares. Various names are given to particular types of interference, among them Grimshaw, Novotny, anti-Bristol, Holzhausen, Würzburg-Plachutta and Plachutta.