Successfully reported this slideshow.
You’ve unlocked unlimited downloads on SlideShare!
Weekly Extreme Str8ts Puzzle #57 July 24 – July 30, 2011www.str8ts.com<br />Solution bySlowThinker<br />
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 />
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 />
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 />
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 />
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 />
Solution<br />This puzzle was not too difficult: only a single application of Setti’s rule, no other advanced strategies were necessary.<br />
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 />
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