Some games give scoring rewards for twisting a tetromino into a tight space. When this is done with a T tetromino, it is called a T-spin.
Two basic algorithms, with slight variations, have been used in newer games to detect and reward in-place spins:
Immobile, used in The New Tetris: A twist is recognised if a tetromino locks in a position where it cannot move left, right, or up. There is only a reward if rows are completed in this way.
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