Sudoku Puzzles

Hmmm. This is an interesting place. There was "no comment" on mine. It looks like it could be an altar in a church?

Hi DEBBY.
You are correct. It is an old church"Saint Demiana old Church" in Delta Egypt.
Hope It meets your interest.
Have a very nice time.

A Wagdy photo if I recall of a Coptic Church.

What intricate beauty, Wagdy. Nice photo!

1) Start 23, Unique Possibilities to (UP) 26.
2) f9=8 == h9=8 -- h3=8 == b3=8 -- b6=8 == c5=8 forbids f5=8. UP 28.
3) Naked pair 59 at ef4 forbids d6=9, e6=9, h4=9, i4=9. UP 31.
4) d5=6 == d6=6 -- a6=6 == a6=7 -- i6=7 == g5=7 forbids g5=6. UP 32.
5) Locked 2s at b46 forbid More...

Thank you, Wagdy!

over 1 hour

Clark, I don't see how step 10, which basically says h9=4 == g5=4, forbids h2=4. Have I missed something? Excellent up to that step, further than I got for sure.
Jeff

Clark,
Steps 11, 12, and 13 in your proof look valid even without the elimination of the 4 from h2 in step 10. They take us to UP 47. Continuing from there:
14) Naked triple 129 in box h8 forbids h9=2, i8=19 UP 48
15) ywing i1, h3, h7 forbids i7=1 UP 81.

Jeff

45 mts. Tough today. Nice challenge.

Jeff,
You didn't miss anything. I didn't clean up my proof correctly. Here's a second attempt:

1) Start 23, Unique Possibilities to (UP) 26.
2) f9=8 == h9=8 -- h3=8 == b3=8 -- b6=8 == c5=8 forbids f5=8. UP 28.
3) Naked pair 59 at ef4 forbids d6=9, e6=9, h4=9, i4=9. UP More...

♪♫♪♫•◘○♦♣♠☺☻♥♀☼►◄↕‼◙¶§ "#$%&')*(

Messed that one up right and proper!
Amazing craft work.

Other path, after Clark’s step 3 (UP31)
4’) (6=7)a6 – (7)i6=(7)i1 – (7)*c1={(6)b7=(6)c7 – (6=9)c2 – (9=8)*c1} – (8)c5=(8-2)b6=(2)b4 => b46<>6, UP34
Above AAIC meant that : if c1<>7 we have AIC (used Kraken cell c1=789) :
(6)b7=(6)c7 – (6=9)c2 – (9=8)c1 – (8)c5=(8-2)b6=(2)b4 More...

49:59