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TETRIS GLOSSARY

Three-corner rule

Also called 3-corner rule · 3 corners

A common T-spin test: at least three diagonal cells around the T's pivot are occupied, together with the required final rotation. Corner orientation and the kick used can determine full versus Mini classification.

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COUNT DIAGONALS AROUND THE PIVOT

Three outlined diagonal cells are occupied; one is empty. The required final rotation and Mini classification still matter.