Here is a new challenge:
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anybody who wants to be challenged posts their username and their highest streak
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if you are interested in challenging that person, you respond to the challenge and post your highest streak (which must be within ± 10 days of the initial poster, to prevent too unevenly matched pairings)
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the resulting challenge is the higher one of the two highest streaks + 7 days
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a win is scored if both challengers make it to the finishing line, i.e. if they both succeed in the challenge
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if one of them relapses, the challenge is over