This puzzle was written as a birthday present to Richard Stolk, a giant of the Sudoku world. Determining his age is left as an exercise to the reader.
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Rules
Place a number from 1 to 9 into each empty cell so that every row, column, and bold-outlined region contains every number exactly once. Additionally, the numbers placed on each of the two grey lines must have a total of 50, as must the numbers placed on the marked diagonal.
Difficulty: 6/10
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