netlogo - How can I simulate a moving patch? -

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i'm trying make frogger-like game patches move around , turtle can move onto safe patch. if have few patches red, how can 'move' them around if turtles? have this, seems move more 1 patch @ time , result, red patches destroyed if there more 1 red:

if pcolor = red [ ask patch-at 0 1   [ set pcolor red]   set pcolor black ]

you ask neighbor patch (left or right) painted red , actual patch painted black or whatever default color is.

for you'll want actual patch coordinates. using patch-at asks patch @ 0,1 relative whole world.


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