How are these two 900?

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Failed-Prodigy

I found very interesting game yesterday. It was a battle between two 900s. Just can you tell me how these two could play on 90 percent accuracy? It wasn't completely easy position too... Taking two rooks for a queen is also something at this level, or the knowledge of piece movement... Yeah there were I think 2-3 mistakes that could decide the game but still... They are not 900s.