Nope.Let's check and Playchess.com are totally unrelated.
Fritz 13 & "Let's Check"
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I recently purchased this version of Fritz 13 from Amazon.com.
http://www.amazon.com/Viva-Media-V01001-Fritz-Chess/dp/B00604IFBQ/ref=sr_1_2?ie=UTF8&qid=1368646905&sr=8-2&keywords=fritz+13#productDescription
This was the best price I could find for Fritz 13 so I went for it. It comes with a one month subscription to Playchess.com. My question is, will the "Let's Check" function cease to work once that one month subscription to Playchess.com expires? I can't seem to find a direct answer to that question in any of included information or on the website.