Done. 4 guesses = very annoying.

Done, one lucky guess.

done

1 bad and 1 good guess and done

... many guesses later ...

Frustrated: I've been trying to use an online solver (www.sudokuwiki.org/sudoku.htm) to help me understand how to solve without guessing, but when it dives quickly into "alternating inference chains" I realize that's nothing more than "exhaustive guessing"

SPEL : computers are good at exhaustive guessing! You can check off (boxed, check mark next to the strategy) certain solution strategies on that program and it will not use that, checked technique

Oh, Buggers. I made a mistake! And I was doing so well, seemingly!

TY4 that gman. I use Stuart's wiki all the time as a learning tool. Never noticed the check boxes. Unchecked the alt inf chain and digit inf chain. The nushio forcing chain eliminated a number. It was easy to spot. I've been looking for a simple chain that uses a triple row single number opposite a chained pair. It comes up a lot, just like yesterday's bug. Alternating chains can be difficult to suss out.

If I'm correct the new Windows 10 now being released will allow us to color over screenshots with a mouse and should demystify & make solving Sudoku alternating inf chains ice cream.

Jackt, don't believe the Ads, you may be able to do that if you have a touch screen and a light pen.

Thanks, Adr41n. Found an annotating pen mark up program that works on top of Iron Sudoku in Windows 7 with a mouse - Ink2Go. Free trial runs for 15 days. There are other programs out there too.

Cool jackt, hope it works for you ;-)

go

later

Just D/Led Windows 10. The mark up pen and highlighter come resident on the new Edge browser. Will be awesome to use for Sudoku.

Won't you need a touchscreen? It will work on a pad but definitely not on your desktop monitor

go

ugh - later

done - finally!!!

No, no touch screen needed, Tuco. I used a mouse and a laptop.

Did it, no green, three guesses; one of them lucky.

Somebody please congratulate me. With this game my score just tops 5000, a milestone. If I had been paid to do Sudoku, I'd have $25,000 for my time.

Difficulty score 63. Hard even after going green.