It's a good topic. You chose the word 'blunder' though which narrows down the field significantly unless it was unintentional. Did you literally mean blunder or did you mean the general sense of make a clear error? If you literally meant blunder what's your threshold, XG default of .080?
Also, define Giant. For me it's the top 32 but I know the list extends and it has some meaning past 32 for other people. If you water it down it may make such plays harder to find. Hell, you might have even been using it as a synonym of 'top top player' and not referring specifically to the list for all I know.
I've actually saved quite a few of these as I see them posted on someone's personal Facebook page or a page like Backgammon Strategy and save them for my own future evil ideas. Here's one of the recent one's I saw. Will post more after the clarifications.
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| XGID=--aBBcBBA-C--Acc-b-cA-A---:0:0:1:52:0:0:3:0:10 | |||||
| Blue to play 52 | |||||