Scott Lee "Silly to you, but REQUIRED by the rules. Don't like them, play a different game. In fact, why not make up your own rules? Then you can play yourself and never make a mistake"
It is not REQUIRED to indicate your intended ball and pocket according to the WPA rules for obvious shots. For a called ball to count, the referee must be satisfied that the intended shot was made.
Being the head of The Traveling College of Billiard Knowledge and charging $225 to $375 an hour for this knowledge (but trying to hand it out here for free), I would think you should know the basic rules.
"Nothing is more dangerous than sincere ignorance and conscientious stupidity"
MLK Jr
If it's not required then don't call any shots. But the fact is he did.
It may be obvious, but when you call something else it's easy to understand why this shot became so controversial.
Let's break it down: The shot was obvious, so no need to call it (Side note, to me it's not so obvious. I don't like and don't play so thin cuts (espesially if by cutting it so thin the cue ball is going in the bunch so opening the balls so if I miss I loose the game) so I sometimes don't even see a shot like that. Plus Strickland thought about and lined up multiple shots, so I wouldn't know what did he ultimately decided to do) . Strickland however called something else, so I would expect him to play the shot he called. It's not my fault he called something else, it is his. And I expect from any profesional sport that the player who makes a mistake is punished by the rules. He is a profesional player, we don't play for fun in the local pool hall, he is playing in a profesional event. I expect him to be treated like a profesional and not a amature learning how to play and "oh, you made a mistake, that's all right, try again". And again, I don't care why he made a mistake, the fact is he did. I don't care if he got confused, his head hurt, his eyes were seeing the light of the truth, I don't care. Name ANY profesional sport in which if a player makes a mistake (admittedly a stupid one, but even so) he is treated with "oh, that's ok, no worries, continue".
Not even darts treat profesional players like that.
https://www.youtube.com/watch?v=BQk7jrlAvbM
Here is a video of Phil Taylor (something like 16 times world champion) miscounting and bust. It's obvious to the commentator since the 2nd dart that Taylor miscounted. Taylor makes 3 great darts, taking 139 when he needed to take 129. Yes, the darts were difficult, but doesn't matter, that's not what he needed to do. Result? "No score".
They didn't say "oh well, you made a mistake but come on, it was obvious you thought you had 139, so ok, you win"....