This was another real toughie. It took me quite a while to get a hook into it, although it fell into place after that. Be interesting to see how many people in total solve it.
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| Killer Sudoku 15 January 2021 https://www.calcudoku.org/forum/viewtopic.php?f=19&t=1318 |
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| Author: | paulv66 |
| Post subject: | Killer Sudoku 15 January 2021 |
This was another real toughie. It took me quite a while to get a hook into it, although it fell into place after that. Be interesting to see how many people in total solve it. |
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| Author: | pnm |
| Post subject: | Re: Killer Sudoku 15 January 2021 |
DId you get the achievement? 
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| Author: | paulv66 |
| Post subject: | Re: Killer Sudoku 15 January 2021 |
pnm wrote: DId you get the achievement? Yes thanks. ![[thumbup]](./images/smilies/msp_thumbup.gif "ThumpUp")
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| Author: | michaele |
| Post subject: | Re: Killer Sudoku 15 January 2021 |
paulv66 wrote: This was another real toughie. It took me quite a while to get a hook into it, although it fell into place after that. Be interesting to see how many people in total solve it. Here is my method for solving this puzzle. I found it to be an interesting puzzle to solve. 1. Calculate cage values b9=7,9 g6=6,8,9 i6=6,7,8,9 2. Add row 9 >> a9+d9=8 >> a9 & d9=2,3,5,6 3. Cage e9 must have 8, it is the only cage in row 9 that can have 8 4. g9,h9,i9 can not be 8 (refer to cages g6,i6: both g6 and i6 would be 8) >> e9 or f9 must be 8 5. g7,g8,i7 can not be 6,8,9 (by adding cages in the 3x3 box e9+f9 would have to total 8) >> i7=7 6. Using same method as step 5 g6 is not 9 7. Add columns f,g,h,i >> e1,e7,e9 = 6,8,9 8. Add 3x3 box (g7:i9) >> e9+f9=9 >> e9=8, f9=1 9. Calculate cage values i2=6,9 i4=1,2,4,5 g5=2,4,7,9 10. Cage h5 must have 2 or 4 >> cage i4 can not be 2,4 11. Calculate cage values h7=1,2,3,4,5,6 cage e9: g9=2,3,4,5 h9=3,4,5,6 i9=2,3,4 12. Calculate cage values h3=2,3,7,8 (note in column h 1 must be in h7 or h8) 13. Cage g5 must be 2,9 (only cage with 9 in 3x3 box) 14. Calculate cage values h3=3,7 (refer to cage h5) e1 each cell can be all available values b1 =4,5,6,7,8,9 15. g4 & g5=3,4,7 (note that g4 or g5=4) 16. Cage b2 is not 4,9 (cage e1 would have no possible values) (note h2 would be 4 if cage b2=4,9) 17. Add row 1 >> a1+d1=h2+1 >> a1+d1=5,6 or 9 >> a1,d1=1,2,3,4,5,6,7,8 18. Add 3x3 box (a7:c9) >> a7+c7+c8=8 a7=3,5 c7&c8=1,2,4 (note c7 or c8 must be 1) 19. In column d the only cell that could be 9 is d5 20. g5=2, g6=9, a6=7, a7=5 c7&c8=1,2 21. Add 3x3 box (d7:f9) >> d7=c8+2 >> d7=3,4 22. d8,e8 or d9 must be 2 >> c8 is not 2 >> c7=2, d7=3, d6=4 From this point it is all basic steps to complete the puzzle. |
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