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2022-08-08 20:50 dustin  
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a mini formation where the fireflies move inside a 2x3 rectangle! when the fireflies are in one of the middle positions, they stop for one frame because they're blocked by each other and by the butterflies. the butterflies are freely spinning.  
  
short loop = 4 frames  
long loop = 8 frames.

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2022-08-08 22:13 Arno  
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very nice! :-D  
  
this seems to be the smallest dfs in open air (so without help of a fixed item like a wall).  
  
i quickly checked that this dfs has a mirrored counterpart as well...! :-)

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2022-08-08 23:06 dustin  
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thx  Arno ! :d  
  
i'm pretty sure it is really the smallest dfs. when my brother programmed his computer to find dff, he didn't include the explicit condition that the formations must actually move. so the engine looked for dfs as well, and with 2 or 3 flies, none were found :)

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2022-08-08 23:15 dustin  
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btw the engine found three more variants of this dfs (where the rectangle is always 2 columns and 3 rows). i'll upload them soon, but perhaps you want to find them by yourself first? :d

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2022-08-08 23:35 Arno  
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i see, the top or bottom bfly may be replaced by a ffly, such that they block the middle fflies at the same time. this gives 4 possible combinations.  
  
all 4 form a mirrored pair with bflies/fflies interchanged, which gives 8 dfs's in total. :-D

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2022-08-09 01:25 dustin  
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oh, that's interesting - the engine must have left out some dfs! it's also possible to have 2bf in the middle instead of ff, which gives even more dfs! :d

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2022-08-10 00:36 DarkStoorM  
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full \ run is free :D

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2022-08-10 14:55 dustin  
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great! :d