Solution to the weekly extreme Str8ts puzzle #37 from www.str8ts.com

1. Weekly Extreme Str8ts Puzzle #37 March 6 – March 12, 2011www.str8ts.com Solution bySlowThinker

2. Start

3. B4=2c, A8=8h, A1=3c, A3=6c

4. E3=8h, B3=5, E1=7d, E2=9, D1=6c

5. G5=7p, B5=3p, B7=1, B9=8

6. A7=2c, A5=4, A6=7, D5=2, C5=5

7. B6=6, B2=7, C6=4c, G9=9p, G6=8p

8. J6=9, J5=8, H5=9, H4=8

9. F9=6s, E9=5s, D6=1p, D8=7, D2=8p

10. C2=6, F8=5, F6=2, F2=4, G8=6

11. E6=3, E7=4, E8=2, D7=3, D9=4

12. G7=5, H7=6, H6=5, C9=2s, J9=3

13. J3=2d, J2=1, J8=4, G3=3, H3=4, G2=2

14. G1=1, H1=2, H2=3, H8=1, C8=3 Done

15. Glossary Letters appended to steps indicate the last strategy used, just before filling in a field: No letter … number was last candidate in field s … single (last) candidate for that number in compartment c … compartment range check d … stranded (unreachable/impossible) digits removed h … high/low range check across compartments p/t/q … naked pair / naked triple / naked quadruple ph/th/qh … hidden pair / hidden triple / hidden quadruple x … X-wing (2 rows / 2 columns) w … Swordfish (3 rows / 3 columns) j … Jellyfish (4 rows / 4 columns) L … large gap field Sx … Setti’s rule (count the numbers rule) – ‘x’ is the analysed number u … unique rectangle y … Y-Wing (or extended Y-Wing e.g. XY-Chains)

16. Weekly Extreme Str8ts Puzzle #36www.str8ts.com Solution by SlowThinker Note: there are other (maybe easier) ways to solve this puzzle.