Chicago Open

Chicago Open (or CO) is a summer open tournament held annually at the University of Chicago, generally occurring in the last week of July or first week of August. Its most distinguishing feature is its extremely high difficulty (usually more difficult than the year's ICT or ACF Nationals), which usually makes the Chicago Open set the most challenging of the calendar year.

The first Chicago Open was held in 1999 as the successor to Virginia Open, a similar tournament held at Virginia in 1997 and 1998. Its most recent edition was edited by Matt Bollinger.

A true open tournament, Chicago Open attracts current college players, retired or graduated players, and, occasionally, ambitious high school players. Participants generally play on mixed teams not limited by school affiliation. In recent years, the tournament has been a full round-robin among all participating teams, which can last well into the evening. The combination of the tournament's extreme difficulty and deep field makes the assembly of a winning CO team one of the most challenging accomplishments in quizbowl.

Chicago Open typically occurs alongside several side events, including a Trash tournament and subject tournaments in science, history, and literature. The number and placement of CO side events is an open question for the future as the main tournament gets longer and more grueling.

Tournament	Champion	Second Place	Stats	Editor or Writer
1997 Virginia Open	?	?	?	Andrew Yaphe (wrote tournament)
1998 Virginia Open	Eric Hillemann, Tom Waters	Dave Hamilton, John Nam, Julie Singer, Maureen Smith	Stats	Andrew Yaphe (wrote tournament)
1999 Chicago Open	Tom Waters, Albert Whited	Eric Hillemann, R. Hentzel	Stats	Andrew Yaphe (wrote tournament)
2000 Chicago Open	R. Hentzel, Eric Hillemann, Emily Pike	Ezequiel Berdichevsky, Dave Goodman, Dave Hamilton, John Nam	?	Andrew Yaphe & Subash Maddipoti (editors of packet-submission tournament)
2001 Chicago Open	Andrew Yaphe, Ezequiel Berdichevsky, Dave Hamilton, Mike Angel	Adam Kemezis, Paul Litvak, Ben Heller, Noel Erinjeri	?	Subash Maddipoti (editor of packet-submission tournament)
2002 Chicago Open	Eric Hillemann, R. Hentzel, Emily Pike	Ezequiel Berdichevsky, Paul Litvak, Ryan McClarren, Ed Cohn	?	Subash Maddipoti (wrote tournament)
2003 Chicago Open	Chris Borglum, Kelly McKenzie, Raj Dhuwalia, Seth Kendall	Paul Litvak, Ezequiel Berdichevsky, Andrew Yaphe, Ben Heller	?	Subash Maddipoti (wrote tournament)
2004 Chicago Open	Jeff Hoppes, Seth Teitler, Andrew Yaphe, Paul Litvak	Mike Sorice, Matt Weiner, Sudheer Potru, Andrew Ullsperger	[1]	Subash Maddipoti (editor of packet-submission tournament)
2005 Chicago Open	Mike Sorice, Andrew Ullsperger, Ezequiel Berdichevsky, Matt Weiner	Seth Teitler, Andrew Yaphe, Adam Kemezis, Wesley Matthews	Stats	Subash Maddipoti (wrote tournament)
2006 Chicago Open	Dave Rappaport, Will Turner, Matt Lafer, Andrew Yaphe	Ryan Westbrook, Eric Kwartler, Jerry Vinokurov, Charles Meigs	Stats	Chris Romero & Ezequiel Berdichevsky (editors of packet-submission tournament)
2007 Chicago Open	Sudheer Potru, Mike Sorice, Andrew Ullsperger, Matt Weiner	Matt Lafer, Ray Luo, Jerry Vinokurov, Ryan Westbrook	Stats	Seth Teitler (editor of packet-submission tournament)
2008 Chicago Open	Jonathan Magin, Eric Mukherjee, Jerry Vinokurov, Matt Weiner	Selene Koo, Mike Sorice, Seth Teitler, Andrew Yaphe	Stats	Ryan Westbrook (editor of packet-submission tournament)
2009 Chicago Open	Andrew Hart, Rob Carson, Brendan Byrne, Matt Weiner	Ted Gioia, Dallas Simons, Jerry Vinokurov, Eric Mukherjee	Stats	Eric Kwartler et al (editor of packet-submission tournament)
2010 Chicago Open	Dallas Simons, Richard Mason, Kevin Koai, Matt Weiner	Bruce Arthur, Seth Teitler, Selene Koo, Jonathan Magin	Stats	Jerry Vinokurov et al (editor of packet-submission tournament)
2011 Chicago Open	Andrew Hart, Jeff Hoppes, Selene Koo, Seth Teitler	Matt Weiner, Matt Bollinger, John Lawrence, Gautam Kandlikar	Stats	Ryan Westbrook et al (editor of packet-submission tournament)
2012 Chicago Open	Matt Bollinger, Eric Mukherjee, John Lawrence, Chris Ray	four-way tie; by PPG Jeff Hoppes, Gautam Kandlikar, Andrew Hart, Mike Sorice	[2]	Ryan Westbrook, with Mike Bentley et al. (editor of packet-submission tournament)
2013 Chicago Open	John Lawrence, Jeff Hoppes, Seth Teitler, Selene Koo	four-way tie; by PPG Rob Carson, Auroni Gupta, Ike Jose, Jerry Vinokurov	[3]	Matt Bollinger et al. (editor of packet-submission tournament)