You didn't play too well but your opponent played exceptionally well for a 600. What you didn't mention was that this was a 3 day game which changes quite a bit. You hung two pieces and your position collapsed from there, though your opponent converted very well for a 600 rated player
Am I this bad or was my opponent just too good?
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Had to resign as I felt too overpowered by my opponent. He was 600 ELO