BChC, 2010
pdf 1th round Problems Solutions Regulations Tulemused
pdf 2nd round Problems Solutions Tulemused
pdf 3rd round Problems
pdf 4rd round Problems ans solutions
pdf 4rd round Tulemused, lühendatud Tulemused
BChC, 2009
pdf Results
pdf 1st round Ülesanded Задания Problems Solutions Answer sheet
pdf 2nd round Problems Solutions Answer sheet
pdf 3rd round Ülesanded Задания Problems Answer sheet
pdf 4th round Solutions