Marcin Kowalczyk
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Marcin Kowalczyk is a Polish speedcuber specializing in blindfolded cubing.
Marcin set the multi-blind world record of 41/41 in September, 2013, at SLS Świerklany 2013. He set multiple other MBLD records before this. He also has the 3BLD world record single of 21.17 and average of 27.51.