OMO Problems

Fall 2019

OMO Fall 2019 Problems
OMO Fall 2019 Solutions: coming soon!
Results
Statistics
Top Teams

Clarifications/Updates

Problem 10: The problem statement has been updated to clarify that two cells are neighbors if they share an edge.

Problem 19: The original statement was erroneous. The problem statement has been updated; now the problem says AN=17, not AN=19. Note that the answer to this new version is different from the answer to the old version.

Problem 20: The problem statement has been updated to clarify that a word may consist of one white square.

Problem 22: It is allowed for s' to equal s in the definition of what an antibijection is.


Below are problems, solutions, and results for all the past OMO contests. You can also find all the problems (and discussion) on the Art of Problem Solving site.

Fall 2019 Results

OMO Fall 2019 Problems
OMO Fall 2019 Solutions: coming soon!
Results
Statistics
Top Teams

Spring 2019 Results

OMO Spring 2019 Problems
OMO Spring 2019 Solutions
Results
Statistics
Top Teams

Fall 2018 Results

OMO Fall 2018 Problems
OMO Fall 2018 Solutions
Results
Statistics
Top Teams

Spring 2018 Results

OMO Spring 2018 Problems
OMO Spring 2018 Solutions
Results
Statistics
Top Teams

Fall 2017 Results

OMO Fall 2017 Problems
OMO Fall 2017 Solutions
Results
Statistics
Top Teams

Spring 2017 Results

OMO Spring 2017 Problems
OMO Spring 2017 Solutions
Results
Statistics
Top Teams

Fall 2016 Results

OMO Fall 2016 Problems
OMO Fall 2016 Solutions
Results
Statistics
Top Teams

Spring 2016 Results

OMO Spring 2016 Problems
OMO Spring 2016 Solutions
Results
Statistics
Top Teams

Fall 2015 Results

OMO Fall 2015 Problems
OMO Fall 2015 Solutions
Results
Statistics
Top Teams

Spring 2015 Results

OMO Spring 2015 Problems
OMO Spring 2015 Solutions
Results
Statistics
Top Teams

Fall 2014 Results

OMO Fall 2014 Problems
OMO Fall 2014 Solutions
Results
Statistics
Top Teams

Spring 2014

OMO Spring 2014 Problems
OMO Spring 2014 Solutions
Results
Statistics
Top Teams

Fall 2013

Problems
Solutions
Results
Statistics
Top Teams

Winter 2013

Problems
Solutions
Problem Statistics
Results
Top Teams

Fall 2012

Problems
Solutions
Problem Statistics
Results
Top Teams

Winter 2012

Problems
Solutions
Problem Statistics
Results
Top Teams