Climbing Ranked

So I have a few questions about how the ranked system works. I got into playing rankeds only recently and there were a few points that confused me. **1. **How does promo actually work? I thought it was _win atleast 2 out of 3 to get promoted_, but as I went into promo I lost one game and got instantly promoted after winning the second one. **2. **How does "guaranteed win" actually work? What's the logic behind that?
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