I just finished Ruud's Clueless Sumo #1 puzzle, which he
posted to his site on 1 December 2006. As he stated on that site, it's a fairly easy puzzle, not even an X-wing (that eliminates candidates).
Puzzle codes:
Code:
001000000300700004740089001080000000000000040007000023900020000802000000100037000
000000000920040086087302450800000005700000003006000800000030000000000000000000000
000000100200008009600390082000000090070000000930000500000010004000000701000760005
000170000000020000000406000000002007004700081000950020000000000000280000000090000
000031000000080000000605000400800000390002800080093000000000000000014000000020000
180003000065200000030000000000000000000000410000000000090000000014700000870001000
000000000000010000000908000300000008000000000500000009000209000000080000000000000
000100037000007140000000080000000000031000000000000000000000070000005390000900026
000040000000360000000000000000620050003800091000001002000902000000030000000510000
000060000000013000000000000050092000260005800900100000000907000000020000000084000
700089000502000000300010000006000094000000050090000000650073002200900003007000000
000000000000000000000080000002000500800000001300000007051702380470050012000000000
000850009000000602000070008740000200020000000000000010400390065300008001000000400