Shredder Classic 4 Chess Rating

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lupe14

After playing 15 ratedgames agansit Shreeder Classic 4 on the adjustable strength, it says I have a elo rating of around 1300. I find that very strange though, I have a rating of 900 on this site. Is it cause of the Shredder rating not being accurate? Or is it cause of a diffrent system of rating on this site vs shredder?

chess_cake

If you play more games, your estimated rating will be stable.