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by ChainOfFools 1923 days ago
OP may be referring to algorithms that rotate between a fixed set of widely dissimilar POW puzzles, in an attempt to make it discouragingly expensive to design and fabricate a rather complex ASIC requiring a lot of die space.

IIRC it didn't work for long (the of promoters of these tokens were likely well aware of this), and ASICs for them appeared anyway, once an ROI probability threshold was reached.