Puzzle 62802

lichess.org/training/62802

If you take this to the analyzer, his queen is to move to a different square and his rook is supposed to take our bishop after we take his. I don't understand the purpose of this tactic. We shouldn't be up material and the opponent moves here are different than the computer recommends...

You have a passed d pawn that becomes a monster. The computer evaluation isn't only based on material. That's why you can sac your Queen and the computer can still say you're winning.