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29 February 2008 @ 10:12 am
Stanford Puzzles 4 and 5  
Two more weeks of puzzles are now up on Youtube. Unfortunately, a camera problem in week 4 prevented the camera shooting my answer paper from being used so that solving video is not useful as you can't see what I'm writing. We'd also discussed using the paper shot more in my discussion videos for the last half of the series and while that could not be done in week 4 for the same technical reason, it will be done for weeks 5 through 8. However, don't ignore the week 4 puzzle as it is the most beautiful of Wei-Hwa's puzzles that we are using in this series, with a nice exploration of a diagonal theme of a blown-up 123456789 standard box. I discuss this explicitly in the explanation video if you don't see what sets this apart from randomly generated puzzles.

I felt I solved Puzzle #5 a little slowly, but it has a narrow solving path and I wasn't seeing the necessary point when I solved it. It is very good practice for "pointing pairs" which make natural sense with my note system anyway.

Puzzle #4 - by Wei-Hwa Huang

Solution of Puzzle #4 - 1 minute, 43 seconds

Puzzle #4 explanation

Puzzle #5 - by Wei-Hwa Huang

Solution of Puzzle #5 - 3 minutes, 10 seconds

Puzzle #5 explanation
zundevilzundevil on March 1st, 2008 12:35 am (UTC)
Good news: The first puzzle? 1:38!

Bad news: I'm still waiting to get a time for the second one. Not sure what went abysmally wrong. Hopefully the explanation video fills in the holes.
motrismotris on March 1st, 2008 12:48 am (UTC)
I'll chalk the slight difference on the easier puzzle to writing on a large grid in red marker and being mic'ed so I couldn't hum to myself.

I entered the second grid into scanraid to make sure I had the right one and it still solves in singles. Let's hope you can sort out your problem.
zundevilzundevil on March 1st, 2008 01:56 am (UTC)
I didn't realize you had non-ideal conditions. I still long for the day (and that day may never come) when the explanation is "I guess you were a little bit quicker on that one".

Then again, since I didn't spot the advanced technique (*cough*) that led to a 9 going in R8C9 of puzzle #5, I guess I don't blame you for not wanting to concede anything.

Incidentally, I've hit a bunch of walls during today's solving. I guess that brilliant 22min kakuro solve took a lot out of me.