The New Sudoku Players' Forum

[cat]

I have learnt all about naked triplets etc, but have tried everything I know on this puzzle

4-- -9- -6-
-98 6-- -4-
-36 -54 79-

671 438 259
--- 9-- 837
389 572 614

9-2 -4- 18-
8-3 --9 47-
--- -8- 923

I've received a hint for a 1 in R3C1, but no idea......

[cat]

I went away, had another look, and discovered a simple case of naked doubles. The rest simply fell into place!