What's up with the chessbots here?

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PearlFey

I assumed that the difference between the difficulty of rated chessbots was just how many plys they searched, but is it also how many blunders they throw in?

I was having trouble with a chessbot until it threw it's queen to her death for the hell of it. 

Incidentally, I played a game against a guy who blundered a piece and then systematically threw away all of his pieces instead of resigning.