Thomas Snyder - Solving the S.U.-doku puzzle

[kirshara]

i just got into it, this is so amazing. whats the math behind solving a puzzle?

[fizzymojorider]

@kirshara there is none, it's pure logic and reasoning.

[TheLillyhardwood]

how do we know he didn't memorize all of the numbers?

[l3069210]

@TheLillyhardwood I think he's quicker to finish the sudoku that memorizing all the numbers ^^

[TheNewVideos]

what does he makes these stripes for?

[kakurolad]

Because of the 123 in the bottom-left box in row 7 which draws your attention to that row, I certainly got the 8 at 0:19 by looking for digits in the bottom that were not 123 but could be forced into row 7. There's only one spot for the 8 in that row at the start, and you can trivially put a 4 to the left of the 8 as well although I manage to move around the whole puzzle for a long time before coming back to do that.

[barnbarn2000]

How he figured out the 1 is pretty impressive before the 8 at mark 19 sec. He gets the 8 by using elimiation because it cant be the bottom three in cell H because of the 8 on the bottom of cell i. cant be the left boxes of cell H cuz of the 8 in left cell of 8. which leaves the top middle and middle squares as possibilities. Look at cell G, only 8 can be in middle, which means that in cell H it cant be middle square, which means it middle top.

[barnbarn2000]

third sentance should read, "cant be the left boex of cell H cuz of the 8 in the left on cell i.

[cstrat007]

he got the 8 by eliminating it being 4 or 5 which are above on the vertical

[jamesfirst92]

?? what ??

[moemoemoemoemoe]

how does he get the 8 in 00:19???

[jamesfirst92]

u cant put 8 below 9 and next to 1, cos there's already an 8 in the row... and the bottom right corner box already has 8 which means that 8 MUST go where he put it in 00:19

[biggie991]

did difficult puzzle in a little over 5 minutes

[haloharmon4life]

wow. my idol.

[sdmoopa]

it looks like hes just writing random numbers down.

[greentrigger]

I noticed he writes the numbers at the line to remind him it might be able to go there. Pretty smart idea.

[kennethcalayag]

he's quite fast. it will take me at least 8 minutes when solving hard one. solving sudoku puzzle is like solving engineering mechanics problem, where you can make assumptions.

[ParadoxGeek]

Oh and BTW.. Some people (like the Mensa sudoku guys) think that a real sudoku is symmetric, but I don't know if I agree with them...

[ParadoxGeek]

You could have made this video more exciting by explaining what you do. I recognize the solving methods from a book... writing the candidate numbers on the lines. I think it's faster to just keep them in your head.

[indeng89]

ben de sizi çok farklı zannederdim çözüm yönteminiz benimkiyle aynı sadece azıcık daha hızlısınız ama yine de aferin size.