Have the bots been completely nerfed?

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WockaWockaWocka

As the title says, in the past week or so I've really been wondering if the bots have been nerfed.  

It took me many attempts to get through the 2000/2100 bots but in the past week I've beaten Professor Doctor Wumpus (3100) as well as all the 2200 bots and 2250 bots. Many were beaten on my first try and most of these wins were not spectacular by any means.  I beat Pandolfini with only 79.5% accuracy, for example. 

So what gives?  Nerf the bots over time so players feel like they're improving?  

WockaWockaWocka

And these wins are with no help, with no time control and no other means of gaming the system. Just regular sloppy chess.