A 10-year-old Ukrainian checkers master is taking on all challengers to support her country and raise money for Ukraine's army.Valeria Yezhova set up a small folding table outside of a busy Kyiv shopping center, ready to play any opponent who dares to play checkers against her.But she's no average player — Valeria is a world champion for her age group. She told CNN she hasn't lost a game during the fundraiser yet.She raised more than $700 over nine days she spent playing outside the shopping center.Watch the video above to learn more about this story.