17:00 Next step is the line in box 8 with the 9 already on it..... minimum is 9+4+2 and maximum in the circles in row 9 is 7+8 which is also 15 !!! 30:00 R8C3 cant be 6 otherwise R7C2 would be 4, the circles would be 9+2 and that would conflict with R7C7 !!! 35:00 6 was placed for ages in box 4 !!!
17:00 Next step is the line in box 8 with the 9 already on it..... minimum is 9+4+2 and maximum in the circles in row 9 is 7+8 which is also 15 !!!
30:00 R8C3 cant be 6 otherwise R7C2 would be 4, the circles would be 9+2 and that would conflict with R7C7 !!!
35:00 6 was placed for ages in box 4 !!!