Sudoku Puzzles

anyone who reckons they can get these out (tough)in less than 30 mins. has their hand on their ...

pianoist?

Hi Jimmy, according to your remark, I indicated on the sandbox what type are puzzles with detailed proofs. Was that what you wanted?

Good morning gb. Yes, that will help find the type of solution to look for. Look forward to seeing how you translate proofs, do you have a program to check for equivalent puzzles or do you just have very good spacial awareness?
Thanks again,

Jimmy

4 mins 16 secs, pretty happy with that time this morning.

Spotted it gb, in Boxe8 no matter which cell contains the 8 then via c9=%3cell or d5=%3cell cell c5=4
Thanks again gb.

Hi Jimmy,
I visually find the renumbering needed, then I lazily use a program to avoid manual rewriting of grid after renumbering...
it's not so hard to find the renumberings, if you do it by comparing the grids containing remaining possibilities after first simple eliminations. For instance More...

continued...

in the 10/08 grid after 28 cells filled, you see R2 is, among all rows and columns, the only one where all cells are filled.
So : turn 09/12 90°clockwise (Cc-->R7), then renumber (R7-->R2). See? and so on.

proofs about hidden triplets can really come in handy. Love the pics.

Jimmy :'in Boxe8 no matter which cell contains the 8, then via c9=%3cell or d5=%3cell, cell c5=4' : you got it ! It's the exact translation of step 3 in 09/12's proof.

17:56..05/05/06

May 30, 2007.

32 mts.

SE=7.1