TypeCon is the annual grassroots, typography-focused convention run by the non-profit Society of Typographic Aficionados.
 The content of TypeCon conferences focuses on — but is not limited to — the areas of typography, type design, printing, letterpress, calligraphy, the book arts, publishing, design education, and type-related technologies including webfonts.
Disclave was a science fiction convention run by the Washington Science Fiction Association (WSFA) in or near Washington, D.C., in the spring of nearly every year from 1950 through 1997.
 By many counts, it was the third-oldest science fiction convention.
DunDraCon is a four-day gaming convention run by Dundracon Inc.
 It is held each Presidents' Day weekend in San Ramon, California, with open registration and the first games starting on Friday morning, concluding on Monday evening.
 The first DunDraCon was in 1976; the organization incorporated in 1980.
Avalon Hill Games, Inc. is a game company that specializes in wargames and strategic board games.
 Its logo contains its initials "AH", and the company is often referred to by this abbreviation.
 It has also published the occasional miniature wargaming rules, role-playing game, and had a popular line of sports simulations.
 It is now a subsidiary of the game company Wizards of the Coast, which is itself a subsidiary of Hasbro.
The Boardgame Players Association is a non-profit corporation established to support the shared interests of board game players.
 The BPA is best known for hosting the World Boardgaming Championships.
The Boardgamer was a magazine founded by Bruce Monnin after Avalon Hill was bought out by Hasbro and the future of their board games was in doubt.
 The magazine was published between 1996 and 2004.
 The intention was to continue support for Avalon Hill products in the same way "The General" had, as well as (according to Monnin in issue 46 of "Operations Magazine"), any games contested at the World Boardgaming Championships.
Vanished Planet is a cooperative board game that debuted at the World Boardgaming Championships in 2003.
 "Vanished Planet" pits the players against a time limit; the players must succeed in a certain number of goals before this time limit is reached, or they all lose.
Anime Detour is an annual three-day anime convention held during April at the Hyatt Regency Minneapolis in Minneapolis, Minnesota.
 The convention run by the non-profit organization Anime Twin Cities.
The World Boardgaming Championships is a convention held yearly since 1999 by the Boardgame Players Association.
 It was previously held in Lancaster, Pennsylvania, but it moved to the Seven Springs Mountain Resort in 2016.
 It is next scheduled for July 22–30, 2017, at Seven Springs Mountain Resort near Pittsburgh, PA.
 This convention replaced Avaloncon, which had been run from 1991 to 1998 by Avalon Hill.
Itzacon Eire, more popularly known as Itzacon (though not to be confused with "Itzacon", a defunct Sci Fi convention formerly held in Texas) is the premier gaming convention run by the Fantasy and Science Fiction Society (Fansci) of NUI Galway, Ireland.

Question: The World Boardgaming Championships replaced the convention run from 1991 to 1998 by which game company?
Answer: Avalon Hill Games, Inc.