Str8ts Forum

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X Str8ts have an additional constraint: the diagonals A1-J9 and J1-A9 are treated like rows and columns, i.e., digits must not repeat within a diagonal, and digits must form straights within compartments separated by black cells. Numerous X Str8ts have been posted (including one weekly by kst on www...

This was another fun&tricky one! Here's what I could come up with. The part in {squiggly brackets} isn't needed in hindsight, but it does make the solution easier IMHO. I'm curious what others find! * C: naked quintuplet 56789 / hidden quartet 1234 * 5-fish 2 12789, which falls into place immedi...

Thanks for checking, Cosmanita! Care to elaborate how you use Setti 1? I don't find much use for it, other than speed up the end-game. But I may be overlooking something nifty...

Not an easy one, for sure! Here's the best solution I could come up with: * Setti 2 @ A * We have (unusually) 5678 missing from a row, each. This will keep coming back. * CE col 5: E5=3478, F5=178, B5=1238 * Setti 4/5 chain: B5!=8. Otherwise -- 5 in col 4 -- J7=9 (via F7) -- EF1=87 (single 8 in E) -...

I've had another go at the puzzle, trying to find an easier solution. The one major thing I could find is that HC2 (B5!=3) isn't needed. That eliminates the lengthiest chain from the solution. The HP45 towards the end isn't needed, either (although it's pretty obvious at that late stage, so why not ...

no, this after basic elimination, 7 is still present at F3 You're right, of course. Just have to think one notch deeper than I did. Thanks a lot! Same thing for the 8-in-col 1 UR: I did realize A1!=8 (UR). But that could be forced out via col 1 or row A, so I stopped thinking about it. One notch de...

Wow, Klaus, this is the foil solution! Mine was the sledgehammer
To be sure: this is after eliminating 7 from F3, right? After the second UR, we can indeed trim down compartment ranges to the point of having rich fishing grounds. Really beautiful!

This is an interesting one! After standard elimination, we are left with numerous undecided, interacting hi/lo's and, to me, no obvious way forward. Ben (in the 'extreme' str8ts discussion of week 652) points out 2-fish 8 25 and C-H1 must contain 8 (UR A1), also CE A9!=3. Let me throw in H8!=9 (UR)....

This was a difficult one! * AB1 hi (789): otherwise NQ 1234 (all 4 digits required in box 1), conflict with B-Setti col 3 * NQ 6789 box 1; 5 req in AC2: eliminate from rest of col * C3=6 (B power) * B6!=37 because D5!=37 (B power) * 7 is required in either D7 or D9. This will keep coming back. * F-J...