Today a user commented on an Area51 post of mine about the 10 posts (questions + answers) required to fulfill a commitment. He got the Beta badge on Poker and his Area 51 profile shows the commitment fulfilled, but he's only made 8 posts on that site. Have the requirements changed? If not, is it perhaps counting deleted posts or something?
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Yeah, the requirements can be slightly lower if you're an active participant during the private beta. Asking and answering are still the quickest / easiest way to fulfill commitment though, regardless of when you do it.
You should count all non-CW (non-community wiki) posts including questions and answers on both of the main and meta sites (including deleted once). However it's not always achieved by posting exact 10 posts as mentioned here, since the exact logic of achieving commitment fulfilment is publicly not shared not, however it's most likely between 8-10 posts.
In my case I had 7 answers & 1 question on the main site and 1 answer on meta site with rep of 300 (9 posts in total, not 10). This was enough of achieving fulfilled commitment for. So most likely participating during private beta could make the difference.
Here are some hints found in Area51 FAQ section in terms of fulfilling commitment: