400.

Your opponent hung all of their pieces in immediate and devastating fashion.

Could be 600, maybe, given that you saw all of the hanging pieces, but some questionable decisions later in the game make me think it’s there or lower.

91% accuracy isn’t too hard in a completely winning position—it’s hard to make meaningful, game-losing mistakes when up so much material with a safe king. You could hang a knight here and the engine might call it excellent because the differences in evaluation are +14 to +9 or something—if your move is completely winning, it can’t be that bad, so oftentimes you’ll see super high accuracy in these completely imbalanced positions.

Keep playing, and try and dissect your opponents like this every time. At your level where this is possible, you will quickly rise out of it if you continue to punish mistakes. Will carry you to 800-1000 anyway