Why do I see a 'Yay' with a 70% match, and a 'Booo' with a 75% match? Just what the title states.
I'm just a couple of days into this idle CPU utilization thing; I run a CPU miner (x-coin-minerd on a Windows 7 box).
Scrolling through the command line output I see several lines that say 'accepted' - some show a 'Yay', whilst others show a 'Booo'. Yet some 'Yay' show a lower match (70%), and some 'Boo' show a higher match (&gt;75%).
(The previous entries were lost, but the most recent Yay/Boo visible on the command line are posted below for reference)

[2014-06-24 08:37:25] accepted: 14/15 (93.33%), 89.76 khash/s (booooo)
[2014-06-24 08:37:45] accepted: 15/16 (93.75%), 89.75 khash/s (yay!!!)

Why do I see a 'Yay' with a 70% match, and a 'Booo' with a 75% match?
I think that it shows "booooo" when a share is rejected, and "yay!!!" when a share is accepted.

In x/y (z%)


x is the number of accepted shares
y is the number of total shares submitted (accepted+rejected)
z is x/y as a percentage (the percent that are accepted)



  Why do I see a 'Yay' with a 70% match, and a 'Booo' with a 75% match?


Because you had a success which raised you to a 70% success rate, and later (after a few more successes) had a rejection which lowered you to a 75% success rate.

(BTW, I hope you know that mining any SHA256 or Scrypt coin on a CPU is almost certain to cost you more than it can earn you)