I recall reading that somewhere between 70 and 80% of all possible boards start with a match. The game wants you to make a move first before getting any hits, otherwise 70 to 80% of all battles would start with an instant hit, some leading to cascades, and occasionally a win before making a move.
Boards with no possible match are much rarer. I have had two in three years of playing daily.
I used to get several starting boards that would instantly shuffle because there were no matches. I donât ever recall the reshuffles resulting in automatic matches, though.
So theyâve obviously eliminated starting boards with automatic matches. Now theyâve probably also eliminated starting boards with no possible matches (as before, Iâve even seen the board reshuffle 2 or 3 times in a row because of no possible matches available, but havenât seen that happen recently either).
I believe that they have removed both boards with automatic matches as well as boards with no possible matches.
I got an immediate shuffle last month.
And most shuffles result in an matches for me. I can only recall one that didnât⌠and I was disappointed.
I also remember one that set off a massive cascade that made me lose in record time (and ones that made me win).
Hmmm⌠guess they still exist then.
I used to get them on a regular basis, but havenât seen one in a while.
Starting shuffles, I mean. Just to clarify. The ones that appear immediately when youâve started a raid / quest / titan attack or whatever, and shuffle before youâve even touched a single tile. Iâm not talking about the shuffles that happen after youâve used up all the available matches.
Forum said that (starting shuffles) almost never happens, but it used to happen to me quite often. Itâs been a long while since I remember seeing one though. I thought that maybe one of the recent updates had âfixedâ that? Maybe not, if you just got one last month.
Yeah!! Those generous SG guys and their free tornadoes 
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Youâll find your entire roster has been reset to 1-1 tomorrowâŚ
Congratulations! No need to thank me though, I had nothing to do with it. If I had the power to influence summoning odds, Iâd never complain. 
The twenty characters