Puzzle with the Will to Sacrifice

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AstroBullivant

Black to play:

There are at least two important ways to interpret this puzzle: the moves the winning side should make, and the moves the losing side should definitely NOT make. This puzzle is NOT from a game of mine, but if the losing side had just been willing to sacrifice for protection, while he would still be losing according to Stockfish, he would still very much be in the game at the level I and my peers on here play at.