Blunder mate

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Avatar of buooyy

My most fatal blunder of all time: In the final position (playing as black), i was completely winning, and then I blundered mate in one

Avatar of buooyy

Based on this game, what do you estimate my ELO to be, and what is my style? 

Avatar of James121233
600 because of white and a quick player also mate with a bishop the disrespect