3 Mistakes To AVOID When Solving Sudoku
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- Опубліковано 27 лип 2024
- In 3 Mistakes To AVOID When Solving Sudoku by Smart Hobbies, I will show you 3 Sudoku mistakes to avoid when solving Classic Sudoku Round 5 Puzzle 4 of 2024 Sudoku Grand Prix . I call these Sudoku mistakes the 3 “over” mistakes. I show you how to play Sudoku better and how to solve Sudoku faster. I solve this puzzle logically and explain all the expert Sudoku tricks, Sudoku techniques, and Sudoku strategies as I apply them to the Sudoku game.
I used the software program CTC App for this solving video. Puzzle link:
tinyurl.com/34dfbfcs
Czech Republic hosted Round 5 of 2024 Sudoku Grand Prix. Puzzle authors were Jan Novotny, Jan Vondruska, and Pavel Kadlecik.
This video is part of my Sudoku Competition series on my UA-cam channel, Smart Hobbies. The goal of this series is to share the joy of solving competitive Sudoku puzzles with you.
#learn #sudoku #youareawesome
Strategies demonstrated in this video:
Hidden Single
Naked Single
Full House
Pointing Pair
Naked Pair
Naked Triple
X-Wing
Timestamps
0:00 Intro
00:21 It’s Solving Time
00:49 Puzzle Story
01:07 Mistake #1 Overmarking
04:28 Mistake #2 Overcomplicating
08:50 Mistake #3 Overlooking Easy Solves
11:32 Neat Naked Triple Trick
12:44 BONUS Tip
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Let me know what you think and how you did in the comments below. Thank you so much for watching.
Timberlake
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Timestamps
0:00 Intro
00:21 It’s Solving Time
00:49 Puzzle Story
01:07 Mistake #1 Overmarking
04:28 Mistake #2 Overcomplicating
08:50 Mistake #3 Overlooking Easy Solves
11:32 Neat Naked Triple Trick
12:44 BONUS Tip
I solved it in 24:29 without watching the video first, so I'm getting better. I never found a triple, but I did find the X wing, and that helped a lot.
Awesome job Brad. Nice job finding that X-Wing.
My time was 4:04.
Two things that I like about you channel: the hokodu rating and the fact that you solve easy/medium/hard puzzles and not only the insane one's 😅
Thank you!
Awesome job with your time. Thank you for the kind words. I am glad you like the rating system and variety of puzzle difficulties.
Very nice piece of geometrical construct. A lovely fast start: many 4s invite the player to look at the one in the central cell from where you see the easy 4 in the NW corner of block 8, but also the columns in which the pairs of 4s are located in both blocke 4 and 6, which immediately gives you a 4 in r2c1. Coming back to the centre, you note the 5s pointing from up left and down right into the central block: easy 5 in r4c5 and in r8c7. Now you have a matching pairs of 5s in columns 1 and 2 in both blocks 1 and 7, and hence, a 5 in r5c3. Acting upon this, the 2 in r5c1. Now you have the left side forming a wall 236: the 8 travelling upwards from the right in block 7 will be confined to the middle in block 4 and hence, must land below the acquired 4 , in r3c1. This disambiguates our pairs of 5s with a 5 in r3c2 and the other in r7c1, a 6 in r2c3and the last cell in col 1 at row 8 belongs to the 7.. You now have a 36 pair in th middle column of block 7, and you can place the 1 and the 2 to complete the eft side. If you start like this, you have a brand bew puzzle with infinite restrictions to facilitate moving towards the right... I agree: no need for any pencil marking, just look at the geometry and place digits. And don't be frustrated by the fact that the pairs of 4s located in blocks 4 and 6 in the first couple of seconds may not be disambiguated before the puzzle is almost complete... So much fun. Thanks fro challenging us with such beautiful pieces.
BTW, Ur timing, please.
Got 4&5 no's,then filled no's in all cells, X wings 3,3, 4, 5 solved whole puzzle. Sorry forgot time Now watching time.
Yes, after saw your vedio I understood what mistakes I did. You finished with only one X wing, great vedio. Nice to learn. Thanks.
You are welcome. Thank you so much for sharing your feedback.
Because it was billed as easy, I tried the puzzle notation-free. I think that I got at least two-thirds of the way through before giving up. I found an X-wing in 3s, and applying an X-wing notation-free, especially with my mind, is like juggling half a dozen objects. Fortunately, the X-wing gave me two immediate 3s (blocks 7 and 8), after which I put it aside and continued juggling the rest of the puzzle. The X-wing was resolved once I placed 2 in R1C7, and that gave me the rest of the 3s.
I finally gave up notation-free and began centermarking. Once I hit R8C9, I noticed that a cell I thought of as 89 was just an 8. I made short work of the rest of the puzzle.
1:50 I notice that you didn't go the rest of the way with the 5s. The Snyder marks place a 5 in R5C3.
I routinely, defiantly in fact, overmark. But not this time. Notation-free is the diametric opposite. My start was rather different. I filled column 1, placed all the 5s, and eventually spotted the X-wing.
Your denigration of the X-wing: almost always, when I find an advanced position in an NYT Times puzzle, it turns out to be an embarrassment. I hope that I don't have to think of this X-wing as an embarrassment now.
9:00 Which block would I visit next? Based on what happened once I abandoned NF, I'd head for block 9.
Great commentary John. The X-Wing is not a mistake to find. Glad you were able to see it.
I use a sort of "reverse" Snyder notation, where I mark the eliminations caused by a Snyder pair, rather than the pair itself. For example, at the very beginning of the puzzle we have a locked pair of 4's in the right-hand column of block IV. So instead of marking Synder 4's there, I would write in a candidate 4 @r2c3, and then draw a slash mark through it, reminding me that although it looks like a 4 can go here, I've already concluded that it can't.
9:04 I first started looking at block IV due to the heavily restricted middle column, then I smacked myself for not noticing the naked single in row 7.
Interesting, I have not used "reverse" Snyder before. Do you find it helps more with easier or harder puzzles?
@@SmartHobbies It's great for both! Keeps the puzzle cleaner and more readable. They only time I mark Snyder pairs directly is when they overlap, like Snyder 3's and 7's meeting in a cell.
@@fubaralakbar6800 Nice!
No big mistakes for me in this one. A natural unfolding was helped by a bit of short-term memory (45 = row 4 column 5):
45, 74, 21, 87, 53,
51, 31, 71, 81, 32,
23, 83, 93, 78, 72,
92, 17, 15, 76, 54,
67, 29, 56, 65, 95,
75, 89, 79, 18, 24,
26, 84, 85, 86, 35,
25, 38, 39, 27, 15,
98, 97, 48, 68, 43,
58, 42, 52, 47, 57,
62, 63, 12, 36, 34,
13.
Afterthought:
Here are some little variations that some people might enjoy. First, a warm-up:
100 904 006
020 000 050
003 000 400
900 401 002
000 050 000
300 806 005
008 000 700
040 000 080
600 105 009
100904006020000050003000400900401002000050000300806005008000700040000080600105009
HoDoKu rating: Easy 424.
Andrew Stuart rating: Gentle/Easy Grade 67.
=============
Then something a bit tougher:
100 804 006
020 000 050
003 000 400
900 408 002
000 050 000
300 706 005
008 000 700
040 000 080
600 105 009
100804006020000050003000400900408002000050000300706005008000700040000080600105009
HoDoKu rating: Hard 654 (one 'hard' step).
Andrew Stuart rating: Tough Grade 128.
Cool, Julian. Way to go. Thanks for sharing additional variations.
Used pencil marks to finish.
Not a problem. Glad you could complete the puzzle.