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marginal sums

use minor diagonal sums, in the margin, to infer 'possible' numbers on grid, solve grid.

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Sudoku with actual mathematics.

—	wjt, Sep 07 2020

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So, a bit like kakuro?

—	pertinax, Sep 07 2020

A bit, but because the sudoku is setting the uniqueness frame , the diagonals can have repeating numbers unlike kakuro's verticals and horizontals.*

* assuming my knowledge of both games is correct.

—	wjt, Sep 07 2020

Actually, any continuous shape on the Sudoku grid could have a bold frame and sum. A Tetris -like Sudoku Kakuro hybrid.

—	wjt, Sep 07 2020