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2022-08-10 23:21 dustin  
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more new dfs! :d this time, we see fright-3 trying to move but a fourth firefly has something against it, blocks the "sneaky single" for one frame and thereby breaks the chessboard pattern which is characteristic for the fright formations. so the sneaky single moves right through the vortex instead, and then it meets a fifth firefly which also blocks it for 1 frame to restore the chessboard pattern. so the single can start another unsuccessful attempt to break the vortex dancers...  
  
short loop = long loop = 12 frames  
  
i haven't examined the bfly dfs yet. looks very similar though, although fright-3 has no analogous bfly dff!  
  
just as the dfs in funny flies 16/17, these were found by a program. it turns out that searching for dff/dfs by brute force is already problematic with 5 flies because there are so many possibilities to consider. my brother ( a computer scientist whom i asked to program a dff-search) said that for 5 and perhaps even 6 flies, there might still be solutions which don't run for too long, but he doesn't have any great hopes for 7+ flies.  
  
so far he hasn't made a complete 5-fly search. the search where these two dfs were found had to be stopped because of a lack of space. the program also found some known dff, but no new ones so far.  
  
the 4-fly search was complete and we can almost be certain now that we haven't missed any 2-, 3- or 4-fly dff! :d

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2022-08-10 23:24 dustin  
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btw: dfs = dancing fly stagnation = fly formations which influence each other but don't move in the end.

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2022-08-10 23:35 dustin  
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and dff = dancing fly formation, a fly formation which moves as a whole into a certain direction. to solve the cave, you have to change a dfs into a dff! :d

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2022-08-11 08:29 Arno  
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very nice results! :-D