JZ/LS Stacking
From Hard Drop Tetris Wiki
Summary
JZ/LS stacking is a back-to-back TSD method invented by player Yakine. It is characterized by a repeated JZ or LS pattern creating platforms for the TSD to take place.
Basic setup
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The notch setups on the side are typically done with the LSO pieces (assuming LZ stacking), with the I pieces staying near the back. This is definitely the part that takes the most practice.