[3dem] CAHRA Challenge - 14th March preliminary submission deadline

[Joel Greer - STFC UKRI]

Dear all,

It is now less than a month before the March 14th deadline for (optional) preliminary entries to the CAHRA Challenge!
Preliminary entries for each challenge dataset will be ranked against each other in a leaderboard on the Challenge website: https://urldefense.com/v3/__https://heterogeneity.notion.site/challenge__;!!Mih3wA!DnHF8Xvrn29rtggwKIjMfIYyq1zNc7AnGYwmilYSAHlG1q9S_S-B_DxjKfHWAFcGBNN3t_qflyScsTF_9q3ZtjBQzw$ . If you have previously visited, please be aware that you may need to refresh the page to see the latest updates!

The deadline for final entries to the CAHRA Challenge is June 1st 2026.

For challenge-specific updates, please subscribe to the CAHRA Challenge mailing list: https://urldefense.com/v3/__https://www.jiscmail.ac.uk/CAHRA-challenge__;!!Mih3wA!DnHF8Xvrn29rtggwKIjMfIYyq1zNc7AnGYwmilYSAHlG1q9S_S-B_DxjKfHWAFcGBNN3t_qflyScsTF_9q2UzSMCOg$ 

A recording of the launch webinar (14th Nov 2025) can be found here: https://urldefense.com/v3/__https://heterogeneity.notion.site/announcement-webinar__;!!Mih3wA!DnHF8Xvrn29rtggwKIjMfIYyq1zNc7AnGYwmilYSAHlG1q9S_S-B_DxjKfHWAFcGBNN3t_qflyScsTF_9q1AbxtvXg$ 

CAHRA = Community-Wide Assessment of Cryo-EM Heterogeneous Reconstruction Algorithms.
For all challenge information, datasets, and submission timeline, please visit: https://urldefense.com/v3/__https://heterogeneity.notion.site/challenge__;!!Mih3wA!DnHF8Xvrn29rtggwKIjMfIYyq1zNc7AnGYwmilYSAHlG1q9S_S-B_DxjKfHWAFcGBNN3t_qflyScsTF_9q3ZtjBQzw$ 

Please share this with others who may be interested.

The CAHRA Team from the Flatiron Institute, CCP-EM/STFC, and Princeton University

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