Advanced Sudoku: Y-Wings And W-Wings 

You’ve shown an additional caveat to thebY wing I never thought of. Always looked for intersections but didn’t consider eliminating one from the same box if they are close proximity. Never heard of a W wing. Thanks for that.

Thanks for that "W" thing! That's definitely a new one on me.

Thank you for such a short, concise explanation!

This is a great explanation for W wing. Thank you very much for sharing. Keep up the awesome work

Never heard of a W-wing before... been trying to work something out like it on my own when doing puzzles lately. Thank you for posting this! =)

There are interconnecting y-wings at 5:00. You noticed the y-wing on r2c1, r2c6, r9c1 and the y-wing on r2c5, r9c4, r8c5, but made no mention of the y-wing on r2c2, r2c5, r8c2. And the y-wing on r2c5, r9c4, r8c5 actually shares two cells with yet another y-wing on r1c4, r2c5, r8c5. This puzzle absolutely was filled with y-wings.

Great explanation. Ive always enjoyed doing Y wings they are so simple for me. The W wing on the other hand i always fail at. In reality it should be easier!!

Great refresher. Makes more since each time.

I definitely appreciate the proper steps that you take to explain the logic behind the tactics. It's what separates you from the other, straightforward videos. The "tactics" I saw were almost useless until I knew what to look for. I've been using this video as reference when stuck like this. Thank you very much!

That's interesting. I know W wing as something slightly different. The version I learnt (from an app) starts the same, in as much as you have the same pair of candidates in 2 different rows and 2 different blocks, but in the 3rd block, one of the candidates is restricted to the same 2 rows. For example, from the video, you had a 29 pair in block 1 on row 3, and a 29 pair in block 2 on row 2. If, for example, you imagine block 3 still had a bunch of candidate 2s, but they were also restricted to rows 2 and 3, you'd have a w-wing as I know it. You would know that you couldn't have a 2 in both those 29 pairs. At least one of the pairs would HAVE to be a 9, so any square that could _'see'_ both pairs, could *not* be a 9 and can be eliminated. It doesn't eliminate squat in the video example, and not just because block 3 doesn't qualify, but that's the logic behind the version I know of. The 'annoying' level on the app 'Sudoku Joy' has this kind of w-wing almost every time, so it'a immensely useful for me....

Hello, thank you for the videos! I had a question regarding the set up of the first Y-wing: In the center cell of the top-center box where there is a (2, 9), why was 3 eliminated as an option? If 3 is a possible solution, would the following Y-wing still work? Thank you again!

Your videos are really informative and useful. Thank you. What app are you using?

I enjoy your videos immensely. Can I make the polite suggestion that you figure out a way to improve the quality of your audio though?