Möbius-strip crosswords

Randall Rothenberg in the _New York Times_ (1988-08-10) writes that although ["Puzzle Makers Exchange Cross Words"](https://archive.is/K2Hw8) about the fall of ERNE and ESNE and the rise of XEROX and PEACE PLAN, one Robert Guilbert Sr. > was ignorant of the dispute two years ago when he developed a competitive crossword game > called Pago Pago and first became aware of crossword fans' passion for…