From Hard Drop Tetris Wiki
Named so as the pattern of ISZ resembles an unlit Beacon. The first opening template existed beforehand in the Japanese Community as スピアード積み(Speerde Stacking).
This opener aims for a Kaidan in the second bag.
General Shape
To rotate the I into position J, LO, or JOL tetrominos must be placed if not performing a wallkick. In games with symmetrical I rotations this cannot be done with J alone.
The First Bag has a 20.00% Perfect Clear chance, 3 solutions.
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Main Stacking Method
This can be assembled 85.56% of all bags with one soft-drop, or 90.87% for two or more.
With mirror these values become 92.38% and 95.24% respectively.
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Heart Variation
By alternating the heart shapes this covers 78.89% of all bags, resulting in favourable residue to freestyle 6-3.
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Common ideas are to keep L or O in hold to fix height difference after a floating T-spin.
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Other frequent stacks include the folllowing, the latter of which results in a 51.75% Perfect Clear chance with other Perfect Clear continuations that lead to a potential loop.
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These Mechanical TSD setups are also possible (see link):
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All Cover Variation
Covers 100% of bags, can be used independantly or when the Heart variation fails.
- L>O: Use continuations accordingly for L>S or S>L. If possible, for L>S, hold S/Z to fix height difference after taking a T-spin, otherwise place Z rightmost always.
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- O>L: Use the last diagram for the sequence SJO, provided by metallicLurker. For games with 180 the first diagram willl suffice.
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Tetris Stacking: Filling the centre cavity is highly freestyle, but there are also two donations available to use.
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Perfect Clear
Stacking for a Tetris works for both T placements. It also provides a Perfect Clear chance after 8 Lines meaning one can use DPC Setups afterwards to return to a fresh bag.
- T>S/Z: 100% Perfect Clear chance, 72 unique solutions.
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- S>T: 96.87% Perfect Clear chance, 55 unique solutions.
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- Z>T: 94.68% Perfect Clear chance, 38 unique solutions.
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