The name has been used before by someone that found an exploit before the hardfork. They were mining with CPU so I would be skeptical to say they are gpu mining. They might just be firing up their miners on the new fork.
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Thanks for the information. In any case, it does not look very normal if one miner controls 50% of the mining blocks. It really seems to be GPU mining or maybe they found another exploit.
It is odd, something is up. I got 2 POW's in the last 4 hours with 8khps. Maybe a difficulty change? So he fired up his army of miners? It is odd.