At least I needed to use small amount of temporaries. Nice puzzle. :)

Thanks for the puzzle.

I don't know if this is solvable without temps but I guess with a little hint it's totally logical and u won't need temps:


R6C18 is white.

Totally logical no need for temps at all. Thanks.

Also nice puzzle and well done on your 1st one.

Thank You!

Nice one - logical - thank you.

Nicely done, and deceptively easy to make a mistake.