(And if you opponent is playing y-tits-for-a-tat where y is slightly above 1, then your optimal strategy is to reduce x further such that xy<1).
If the opponent keeps increasing Y, and you sit there decreasing X in turn according to this rule, eventually you become cooperate-bot and the opponent turns into defect-bot.
If the opponent keeps increasing Y, and you sit there decreasing X in turn according to this rule, eventually you become cooperate-bot and the opponent turns into defect-bot.
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