EntityQ953306· pop 10· linked from 11 articlesGrimshawSign in to savedevice found in chess problems in which 2 pieces arriving on a square mutually interfereConnectionsInternational Standard Book NumberEntityRedditEntityOxford University PressEntitychess problemEntityalgebraic notationEntityZugzwangEntityKen WhyldEntityDavid Vincent HooperEntityWalter GrimshawEntityNovotnyEntityglossary of chess problemsEntityThe Oxford Companion to ChessEntityCategoriesChess problems