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Str8ts Weekly Extreme #57 - Solution

Solution to the weekly extreme Str8ts puzzle #57 from www.str8ts.com

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Str8ts Weekly Extreme #57 - Solution

  1. 1. Weekly Extreme Str8ts Puzzle #57 July 24 – July 30, 2011www.str8ts.com<br />Solution bySlowThinker<br />
  2. 2. Start position<br />Extreme Str8ts #57 has a good mix of different sized compartments. As it turns out, we need to look for many singles, to solve this puzzle.<br />See my strategy slides for more info:<br />http://slideshare.net/SlowThinker/str8ts-basic-and-advanced-strategies<br />
  3. 3. Solving…<br />B8=3c<br />B9=2c<br />A9=4c<br />C9=3c<br />A4=2c<br />J5=8c<br />
  4. 4. Solving…<br />A7=5c<br />A8=6c<br />C3=7h<br />B3=6c<br />
  5. 5. Solving…<br />B4=8s<br />C4=4c<br />C7=2<br />After this C2=19, a large gap pair, which means we can remove 19 from all other cells in column 2.<br />
  6. 6. Setti’s rule on 1<br />3 columns do not contain a 1  three rows must not contain a 1 either  no 1 in row F and row J. 6 rows contain a 1  6 columns must too  there’s a 1 in columns 1, 2, and 8.<br />
  7. 7. Setti’s rule on 1Result<br />Due to range checks, we can remove 4 from GHJ1 and 9s from columns 2 and 8.<br />C2=1S1<br />C8=8<br />C6=9<br />F8=7<br />
  8. 8. Solving…<br />From here on it is easy. Many singles though.<br />F9=8h<br />D5=2s<br />F5=5<br />D8=1s<br />D7=4p<br />E7=3<br />
  9. 9. Solving…<br />B2=5s<br />E3=2s<br />F3=3<br />F4=6<br />F2=2<br />
  10. 10. Solving…<br />H3=1<br />H2=3<br />H1=2<br />J1=3<br />G1=1<br />J2=4<br />J3=5<br />
  11. 11. Solving…<br />J9=9<br />G3=4<br />E5=1s<br />E1=9s<br />B1=7c<br />D1=6<br />D2=7<br />
  12. 12. Solving…<br />G2=6<br />E8=4s<br />H8=5<br />H5=4s<br />B5=9<br />G5=7<br />
  13. 13. Solving…<br />G9=5<br />G4=3<br />D4=5<br />D6=3<br />E4=7<br />
  14. 14. Solving…<br />G6=8<br />G7=9<br />H6=6<br />E6=5<br />E9=6<br />H9=7<br />H7=8<br />
  15. 15. Solution<br />This puzzle was not too difficult: only a single application of Setti’s rule, no other advanced strategies were necessary.<br />
  16. 16. Glossary<br />Letters appended to steps indicate the last strategy used, just before filling in a field:<br />No letter … number was last candidate in field<br />s … single (last) candidate for that number in compartment<br />c … compartment range check<br />d … stranded (unreachable/impossible) digits removed<br />h … high/low range check across compartments<br />p/t/q … naked pair / naked triple / naked quadruple<br />ph/th/qh … hidden pair / hidden triple / hidden quadruple<br />x … X-wing (2 rows / 2 columns)<br />w … Swordfish (3 rows / 3 columns)<br />j … Jellyfish (4 rows / 4 columns)<br />L … large gap field<br />Sx … Setti’s rule (count the numbers rule) – ‘x’ is the analysed number<br />u … unique rectangle<br />y … Y-Wing or XY-chains<br />
  17. 17. Weekly Extreme Str8ts Puzzle #57www.str8ts.com<br />Solution by SlowThinker<br />Note: there are other (maybe easier) ways to solve this puzzle.<br />View & download my strategy slides from:<br />http://slideshare.net/SlowThinker/str8ts-basic-and-advanced-strategies<br />or from Google Docs:<br />http://is.gd/slowthinker_str8ts_strategy<br />

Solution to the weekly extreme Str8ts puzzle #57 from www.str8ts.com

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