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You die 7.6 times per game (Diamond average: 5.5). Deaths hand over gold, tempo and objectives. Before walking forward ask: where is the enemy jungler, and do I have vision of this bush? Trade a kill you are not sure of for a safe recall.
After a loss you win only 20% of the next game, versus 50% after a win. That gap is tilt. Make it a rule: two losses in a row, and the session is over. Your LP will thank you tomorrow.
You spend 11% of your games dead. Late deaths cost a minute each; when a fight is lost, back off and defend rather than adding one more death to it.
