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2022-12-21 01:11 dustin  
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the "no luck but skill" version of cso 250 ;) the intended solution still relies on some luck because the Θ must not grow for the first 32 frames, but the chances are 77.8 percent, while in the original the chances of success were less than 1 percent :d

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2022-12-26 14:22 dustin  
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solutions free!  
  
the following explanations assume that the Θ does not grow.  
  
cso tricks/ effects:  
  
1. in the frame where the Ζ explodes by the Θ, the Η is scanned before the Ζ so it moves into the explosion range.  
  
__Η  
ΖΕΕ  
ΘΕΕ  
that's the picture immediately before the explosion. the Η is scanned first and moves left, then the Ζ is scanned, explodes and the Η vanishes.  
  
^'s first job is to prevent that from happening!  
  
2. this can be prevented by mobilizing a Β just in time so that the Β kills the Ζ and not the Θ. this makes a big difference:  
  
Β_Η  
ΖΕΕ  
ΘΕΕ  
  
now the Β is scanned first and explodes the Ζ. only then the Η is scanned. it can no longer move left because it's now blocked by the explosion smoke. so the Η survives!  
  
3. how to mobilize the Β in time? you can see that in the solutions ^ moves two down, three left and then snape the Γ away from above:  
  
Ε^_  
ΒΓΓ  
Α_Ε  
  
^ is scanned first and snaps down, removing the Γ. the Β is scanned afterwards and can immediately start falling.  
  
instead, why cannot ^ move three down and two left from the start and then snap left?  
  
ΕΓΓ  
ΒΓ^  
Α_Γ  
  
if ^ snaps left here, the Β cannot immediately start falling. this is because the Β is scanned before ^, so the Γ still blocks the Β! the Β could only start falling one frame later, and that's too late to kill the Ζ!  
  
4. after the Ζ explosion, ^ waits for the Η to return, waiting already under the Β. the next job is now to kill the Η and at the same time save the Α before it's crushed in the explosion.  
let's check what happens frame by frame when the Η arrives:  
  
ΓΒΓ ΓΒΓ Γ_Γ Γ_Γ  
Ε^_ Ε__ ΕΒ_ Ε__  
__Γ _^Γ ^_Γ ^ΒΕ  
Α_Ε Α_Ε ΑΗΕ _ΗΕ  
Ε_Η ΕΗ_ Ε__ Ε__  
  
and now the decisive moment: ^ is scanned first, so he's just in time to move left and escape the explosion range before the Β kills the Η! that was close, but that's pretty normal for cso effects! :d  
  
btw, the Λ is just there to exclude the "lucky solution" of cso 250. if the Ζ explodes one step more left, then the Λ disappears and ^ will be one Α short in the end ;)  
  
that was fun to write! :d