This just won a Fide prize for chess composition. Can anyone tell what's going on here? : r/chess

Just got my first issue of BCM but can't figure out how to read these puzzles. I'm guessing #3 for example is mate in three but some say H#3 which has me

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Study of the month - Ding's WCC game 6 checkmate pattern in endgame studies

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This just won a Fide prize for chess composition. Can anyone tell what's going on here? : r/AnarchyChess

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