2015 Chicago Open
|Champion||Sustainable Ibex Farming|
|Runner-up||Scale Abrasions Produced by Unexpected Shifts in Rock Formations|
|Third||Alexei the Argumentative Bear (tied)|
|Fourth||sometimes in this life u must steal submarine (tied for 3rd)|
|High scorer||Jordan Brownstein, Scale Abrasions Produced by Unexpected Shifts in Rock Formations|
|Editor/s||Jerry Vinokurov, with Zeke Berdichevsky, Jonathan Magin, Eric Mukherjee, Rebecca Maxfield, and Aaron Rosenberg|
|Stats||Main Event Stats|
The 2015 Chicago Open was won by Sustainable Ibex Farming, consisting of Matt Bollinger, Tommy Casalaspi, Auroni Gupta, and Matt Jackson, who cleared the field with a 16-0 record, setting aside the Jackson-Bollinger rivalry. The tournament was edited by Jerry Vinokurov, with Zeke Berdichevsky, Jonathan Magin, Eric Mukherjee, Rebecca Maxfield, and Aaron Rosenberg.
For the fourth year in a row, the winning team cleared the field
Jordan Brownstein led the field in scoring and powers, while Matts Jackson and Bollinger were the second- and third-ranked individual scorers, despite being on the same team.
The tournament was unanimously praised for excellent questions of perfectly modulated difficulty.
- CO Visual Arts, written by Stephen Liu with Doug Graebner. Widely praised for excellent questions on a variety of well-chosen, important, and interesting topics.
- RILKE, a literature tournament by John Lawrence with Nick Jensen. Received a somewhat mixed reception due to high difficulty and some sentence structure complaints.
- CO History, run by Jeff Hoppes. The tournament was run as a mostly guerilla event, with packets thus varying wildly in quality.