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# Str8ts: Solution to Weekly Extreme Str8ts #31

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Solution to the weekly extreme Str8ts puzzle #31 from www.str8ts.com

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### Str8ts: Solution to Weekly Extreme Str8ts #31

1. 1. Weekly Extreme Str8ts Puzzle#31, January 23 - January 29, 2011www.str8ts.com<br />Solution by<br />SlowThinker<br />
2. 2. Start<br />
3. 3. A4=2c, A3=3s, C4=1c<br />
4. 4. B2=2c, B1=1c, D2=3c, C4=4c<br />
5. 5. D2=2c, H2=6s(FGHJ2)<br />
6. 6. J8=4c, B6=7c<br />
7. 7. J7=3s, B7=6s, B9=8s<br />
8. 8. C3=2h<br />
9. 9. Removingcandidates<br />Compartmentchecks, high/low, strandeddigits (e.g. 1 in G5), naked pair, etc.<br />
10. 10. C8=8s(C789)<br />… andremovingsome additional candidates<br />
11. 11. D5=8s, C5=5c, C1=3s, E1=4s<br />
12. 12. G7=5s<br />
13. 13. H9=4p, H6=1s, H7=2s<br />
14. 14. G6=3c, G8=2s, F8=1s, F9=2c, E9=3s<br />
15. 15. Setti‘srule: C9=6<br />Setti‘s rule: the number of columns and rows, where a digit appears, must be exactly the same.<br />6 must appear in every column  6 must appear in row C<br />
16. 16. C9=6S, C7=7c<br />
17. 17. A8=6s, D8=7s, D9=9s, A9=7s<br />
18. 18. D7=5s, A7=9s, D6=6s, E6=5s<br />
19. 19. Y-Wing: G5=4<br />Y-Wing strategy: attack a candidatefromtwosidesOrange path: E3=7  E5=6  G5:-6  G5=4Blue path: E3=9  G3=7  G1=6  G5:-6  G5=4<br />Note:becauseofthedetourto G1 thisis not a„pure“ Y-Wing strategy<br />
20. 20. G5=4y, G7=1s<br />
21. 21. F2=9p, F5=7s, E5=6s<br />
22. 22. F4=8c, F1=5s<br />
23. 23. J4=6stranded digit, J1=8s, J3=5s<br />
24. 24. H3=8s, H1=7s, H4=5s<br />
25. 25. G1=6s, G3=7c, E3=9s, E4=7s<br />Done<br />
26. 26. Weekly Extreme Str8ts Puzzle #31www.str8ts.com<br />Solution by SlowThinker<br />Note: There are other (maybe easier or more logical) ways to solve this puzzle.<br />