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2020-10-09 16:00 dustin  
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i solved this just by trial and error. at first i had four or five completely different attempts which, for some reason, all led to 18\, until i found a way for 20 :D

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2020-10-09 18:25 nesdori  
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i tried 7-8 different methods and got 21. then i fine-tuned the method a little bit and got 22! :)

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2020-10-10 18:02 dustin  
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i wonder whether there's any chance for all\...

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2020-10-10 19:20 nesdori  
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i didn't try any more after i got 22. even 23 looks quite hard and currently i have no ideas how to improve my score using some controlled method. but i would be surprised if there's no way to get max \ but it probably is something crazy :)

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2020-10-11 10:21 nesdori  
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my demo free.  
  
right wall, left wall, top, bottom order is quite effective here.   
  
 dustin , your 20\ solution has the same order? :)

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2020-10-11 13:49 dustin  
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 nesdori , actually i don't remember what my original 20\ solution was :D this 20} run here was just a try to reproduce your solution :D but i cannot exclude the possibility that i actually did it that way :D