Pigeoncoin (PGN) is one of the first forks of Raven, but instead of using directly X16R it introduced a modified version called X16S. Well, it seems that PGN is changing their PoW mining algorithm form X16S to X21S, another algorithm that has been available for a while introduced by Ritocoin (RITO) which is another fork from Ravencoin (RVN). The switch from X16S to X21S will occur on the 15th of October 2019 at 00:00:00 GMT. We could not find a specific reason for the algorithm change, we would understand if it was using X16R and wanted to get away from the existing ASIC miners, but with X16S. Still, if you are holding PGN in a local wallet make sure you update to the latest wallet version to be ready for the upcoming fork. If you are mining/trading PGN you might want to make sure your pool is ready for the fork and that you not make transactions near the fork time just to be sure that everything goes smoothly first. As for mining – T-Rex and CryptoDredge for Nvidia and WildRig Multi for AMD should be fine, or at least that was what we sued the last time we have mined using the X21S algorithm.