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2021-10-27 00:05 dustin  
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this might well be the cso cave with the largenst distance between creation and publication - it might be a year old or so :d i remember i got the idea after an email discussion with  Arno  about the phrase "killing two birds with one stone" in different languages :d

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2021-10-27 11:42 nesdori  
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 dustin , in finnish, that phrase is "getting two flies with one swat". the same in german, i suppose :)

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2021-10-27 11:58 dustin  
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yep indeed, and in dutch as well, as i learned from  Arno  :d

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2021-10-27 11:59 dustin  
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if we combine both versions, we get "killing two flies with one stone" - the perfect bd version :d

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2021-10-27 13:15 Arno  
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ah, a miniature of my caves 847 and 854.   
now the question is whether we need a rff with 6 fflies here as well...

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2021-10-27 22:57 dustin  
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 Arno , yes indeed, your magic wall construction in those caves looks ideal to me to force a multi-firefly-kill!   
a rff won't be necessary for this one.

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2021-10-27 23:15 nesdori  
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i'm really not sure if my solution is the intended or smallish short cut. but when i tried a thing which i first thought might be the intended it turned out to be quite hard to execute. it is possible but there are certain aspects why i give only a small probability for it to be the intended solution. so for now, i think my demo solution is the intended :)

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2021-10-28 00:14 dustin  
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my solution is most probably the intended!  
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nah, it's certainly the intended. i remember as much :d

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2021-10-28 11:47 nesdori  
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 dustin , i made another demo. let's see which one is closer to the intended; now i have a feeling that both are different :)

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2021-10-28 14:17 dustin  
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 nesdori , this will be an interesting showdown for sure! :d

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2021-10-30 17:37 dustin  
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my run free! in the explosion frame, one firefly is scanned before the boulder and moves into the explosion range!

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2021-10-30 20:16 nesdori  
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ah! so my first solution indeed was the intended; i was fooled because i couldn't figure out where you spent the extra 10 secs :)  
  
at first i thought the intended is to explode all flies by dropping the |. this however turned out to be quite difficult task because it's hard to get suitable formation and even harder to hit that formation and survive. it's easier to build the formation in the corner and then push the | on it like in my other solution. flies stay in same 3*2 formation for two frames so it's not 1/4 lucky push but there are two chances. because its complexity and luck involvement i assumed it's not the intended.