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2022-08-09 01:28 dustin  
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these are the dfs variants the computer showed :d the principle is always the same as in funny flies 16!

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2022-08-09 09:17 Arno  
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ah that's cool. the mirrored counterparts i talked about also involve bflies in the middle, but of course in a horizontal 3x2 rectangle, while your variant 1 and 2 have bflies in the original (vertical) 2x3 rectangle.  
  
your variant 4 is one of the variants where you replace a supportive bfly by a ffly, but this could be done for each of the 2 bflies or both at the same time.  
  
i even found more variants, because the supportive flies could spin in multiple 2x2 areas, as long as they block the middle flies at the right frame, and not hinder these flies at other frames.  
  
these variant not always have a mirrored counterpart.  
:-D

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2022-08-09 10:55 DarkStoorM  
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You know this BFly formation where they spin in a 2x2 box in the following setup:  
  
...  
.  
.12  
...  
  
1 - FACING LEFT  
2 - FACING DOWN  
. - solid  
  
Is this formation possible in open air? :D

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2022-08-09 12:10 Arno  
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 darkstoorm , i'm sure it's not, as some years ago i tested all possible configurations of 2 flies in open air affecting each other's movements, and all configurations ended up in either a dff (F&F or B&B) or freely spinning flies.

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2022-08-09 18:16 dustin  
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 Arno , i think  darkstoorm  might mean that it could be possible to replace the solid walls by other spinning flies which block the 2bf at the right times and spots, just as it's the case with our new dfs's. ;)

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2022-08-09 19:42 dustin  
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i still think it will be hard or impossible to do it  
there're four obstacles which are necessary for the (original) 2bf-formation:  
  
 .  
.  
.12  
 .  
  
all of these four blockades are needed for two consecutive frames each. that's not possible to achieve with freely spinning blocking flies...

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2022-08-09 19:44 dustin  
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oh shit, the comment didn't accept lines which start with a blank. the formation should be:  
  
-.  
.  
.12  
-.

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2022-08-11 12:07 Arno  
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i'd like to do an attempt to showcase all possible variants (including mirrored pairs when possible) when i have more time... there are many variants in theory also because you can replace the two supportive spinning flies independently... :-D

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2022-08-13 22:38 dustin  
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this would definitely be interesting to find out how many variants there are exactly :d an upper limit should be 2x2x2x4x4x2 = 256:  
  
| one factor 2 for the inner flies (fire- or butterflies)  
| two factors 2 for the blocking flies' genders  
| two factors 4 for the blocking flies' positions  
| and a factor 2 for mirrored pairs