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definitions and information are taken from Rohan Rao blog & Sudopedia

Also known as DG (Disjoint Groups).
Rules:
Place numbers in the grid such that every row, column and 3x3 box contain the numbers 1 to 9. In all the 9 3x3 box the position of a same digit CAN NOT be the same. I.e.: if in r1c1 we have 1, 1 cannot be present in r4c4, r4c7, r7c4, r7c7 (and, naturally, in r1c4, r1c7, r4c1, r7c1).

Inserire i numeri in modo che ogni riga, colonna, settore contenga i numeri da 1 a 9. In tutti e 9 i settori la posizione di uno stesso numero non può essere mai uguale. Cioè: se in r1c1 abbiamo 1 , 1 non può essere presente in r4c4,r4c7,r7c4,r7c7 (oltre che, naturalmente , in r1c4,r1c7,r4c1,r7c1)

The constraint creates 9 additional constraint zones that must contain the digit from 1 to 9. These zones are shown in the following picture with different colors.
La definizione crea indirettamente 9 zone addizionali che devono contenere i numeri da 1 a 9. Queste zone sono indicate nella figura seguente con colori differenti


Solution