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definitions and information are taken from Rohan Rao blog & Sudopedia

Origin: I created this variant on 6 February 2010: As far as I know no one had mentioned this variant before.
Ho creato questa variante il 6 febbraio 2010. Per quanto ne sappia, nessuno ne ha fatto menzione prima.

Rules:
Place numbers in the grid such that every row, column and 3x3 box contain the numbers 1 to 9. Yellow cells contain a number smaller than all diagonally adjacent cells, Blue cells contain a number bigger than all diagonally adjacent cells.

Inserire i numeri in modo che ogni riga, colonna, settore contenga i numeri da 1 a 9. Le celle gialle contengono un numero più piccolo di tutte le celle adiacenti diagonalmente, le celle blu contengono un numero più grande di tutte le celle adiacenti diagonalmente


Solution