Beacon

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.

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.

Heart Variation

By alternating the heart shapes this covers 78.89% of all bags, resulting in favourable residue to freestyle 6-3.

Common ideas are to keep L or O in hold to fix height difference after a floating T-spin.

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.

These Mechanical TSD setups are also possible (see link):

All Cover Variation

Covers 100% of bags, can be used independantly or when the Heart variation fails.

• L>O: Look for which of L or S come first. If possible place S/Z as in diagram two after taking a T-spin, otherwise place Z rightmost always.

• O>L: For the sequence SJO use the last diagram, provided by metallicLurker, when unable to hold. The second template will suffice for 180 rotations.

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.

• S>T: 96.87% Perfect Clear chance, 55 unique solutions.

• Z>T: 94.68% Perfect Clear chance, 38 unique solutions.

See Also

Interchangeable Shapes