Abandoning his passed pawn with 33.d6, White can force 34.Cxd6 + 33 ... Bxd6 Qxd6 vulnerable by the black king to Jaques. According to his wiser, thoughtful, weighted knowledge and belief, that:
A) leads inevitably to win the White Tower or the black queen;
B) leads to an equal position / perpetual;
C) only a pawn sacrifice yourself silly.