She was the runner up at the World U12 Girls" Championship in 2009 and at the World U14 Girls" Championship in 2011. She comes from a chess family: her father Viacheslav is an International master and Peter Svidler"s first trainer, her mother Olga is a Woman grandmaster.
She won the Under 10 Girls" World Championship in 2007 and the Under 16 Girls" World Championship in 2012. Styazhkina also won the U12 Girls European Championship in 2008 and the U16 Girls" European Championship in 2013. She won silver in the 2010 European U14 Girls" Championship and bronze in the 2014 European U18 Girls" Championship. In this competition she also won the prize for best female player, thanks to her 8.5/9 score and a 2485 performance rating.
She was a member of "Peter Rook 1" team that took first place in the 2015 Russian Youth Team Championship.
