- Code: Select all
after singles:
2 19 4 8 19 7 3 5 6
5 3 79 2 19 6 179 8 4
179 8 6 5 4 3 2 79 179
13479 1679 2 47 5 89 179 3679 13789
79 5 8 3 6 1 4 2 79
13479 1679 379 47 2 89 5 3679 13789
379 79 5 1 8 2 6 4 379
8 4 379 6 37 5 79 1 2
6 2 1 9 37 4 8 37 5
one step solution with two simultaneous chains; each of these combinations solves the grid.
c8n9{r3 r4r6} - r5n9{c9 c1} - r3n9{c1 c9} - r7n9{c9 c2} - r3c1{n1n9 n7} => r3c8 <> 7
b1n7{r2c3 r3c1} - r5n7{c1 c9} - r7n7{c9 c2} - c2{r4r6}{n1n6} - r1c2{n1 n9} => r2c3 <> 9
c2n7{r7 r4r6} - r5n7{c1 c9} - r7n7{c9 c1} - r3n7{c1 c8} - r7c9{n3n7 n9} => r7c2 <> 9
b9n9{r8c7 r7c9} - r5n9{c9 c1} - r3n9{c1 c8} - c8{r4r6}{n3n6} - r9c8{n3 n7} => r8c7 <> 7
b9n9{r8c7 r7c9} - r5n9{c9 c1} - r3n9{c1 c8} - c8{r4r6}{n3n6} - r9c8{n3 n7} => r8c7 <> 7
b1n7{r2c3 r3c1} - r5n7{c1 c9} - r7n7{c9 c2} - c2{r4r6}{n1n6} - r1c2{n1 n9} => r2c3 <> 9