End game, middle game review

How could I have ended this game better (I played black). Lost by a narrow margin. Are there any middle game mistakes, after I captured the ladder?

14535217-150-qedap-xoxox.sgf (1.2 KB)

Posted a few variations on your game. It would’ve required some advanced life&death skills. But nothing ventured, nothing gained.

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Yes, that is what I realised also, after analysing game. Without Komi I would have won or may be jigo. Upper left corner is obviously impenetrable.

Do you think in the opening/joseki I could have done better?

Here’s a review: https://online-go.com/review/342267

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Thanks for the review. Left some comments there if you can check. Somehow Keima don’t work for me on smaller boards.