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#1: Tom O'Connell (sensei69) on Feb 25, 2011

tough puzzle Ron... some edge at bottom, but not sure if it takes more than 2 moves ahead...no ? from me (nice puzzle)

after all the green red and blue (and a little of the black) are solved with color logic: edge logic on the 3 in row 20 gives you a dot and that dot forms a very small "row" in which to do edge logic on the 2 in row 19; that gets you all of the bottom half
then the not so easy to see part: the 1 in row 4 either has to go in column 11 or 12 and you can dot out the rest of that row and get more solved

then another tricky bit: at least one of the remaining 1s in row 10 must go to the right (columns 16-18) or they could both go in those columns
if you put one in column 16 then that forces both of the 12s into column 4 (not possible due to the 2 in column 4) so you can dot it
if you put one in column 17 then that forces both of the 12s into column 5 (not possible due to the 1 in column 5) so you can dot it
that gives you a black in column 18

the only way i found to solve the very last part was looking at row 6 with columns 16/17
if you place one of the 2 ones from column 16 or 17 into row 6 it forces the other 2 black clues (from which ever column you didnt choose of 16 or 17) into rows 9 and 11 which causes a violation of one of the 12s so row 6/columns 16-17 are blank and it solves out

great puzzle

tricky. Thanks for the hints bugaboo, they helped.

Thank you, Bugaboo

thx bugaboo, but your words show that one must look more than 2 moves ahead

not at all sensei
where did you think that?

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yes lizteach i meant the 3 in row 19 and the 2 in row 18
(i knew the 3 was the lowest row with a clue in it and the 2 was the row above that and i knew the puzzle was a 20x20 so having that blank row at the bottom messed me up) haha

as far as looking ahead however i dont think thats the case

if you do edge logic on that 2 (by filling in all the black squares and dots that are immediately connected with it as a result of placing it there then you get an error

Cute picture. I guess I logically guessed, because it took me no time at all.

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