Reliable TSD

This is a setup that exists. Some other resources: this sheet; the KR Wiki page; the JP Wiki page; this fumen.

Reliable TSD has various paths. Originally there was a 100% 3 TSD path into a 7-2 board state. In recency, an 85% bag2 path leading to STSD has been popular. This path can branch into a 5-bag PC loop; it can branch into a mech TSD path; it can go into midgame 6-3 freestyle; it can go into a counterspike path.



Bag 1 resembles a TKI shape. Mainly built with early L_tetraminoJ_tetramino bags. L_tetramino before S_tetramino and either J_tetramino or I_tetramino before Z_tetramino. Some spins allow some unintuitive placements for I_tetramino after J_tetramino or J_tetramino after I_tetraminoZ_tetraminoO_tetramino (see KR wiki gifs). 54.44% cover or 64.44% including the mirror.


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Bag 2 uses O_tetramino and S_tetramino to setup the TSD and a box on the side. ~85% coverage. There is an alternative 100% fallback that splits later in its path.

Some tips for building a box out of L_tetraminoZ_tetraminoJ_tetraminoI_tetramino:
The box consists of a 3x4 L_tetraminoZ_tetraminoJ_tetramino, either vertical or horizontal, and either a vertical I on the left/right or horizontal I on the top/bottom.
For Z_tetramino between L_tetramino and J_tetramino (L_tetraminoZ_tetraminoJ_tetramino or J_tetraminoZ_tetraminoL_tetramino), you can build a vertical box.
For Z_tetramino after L_tetramino and J_tetramino (L_tetraminoJ_tetraminoZ_tetramino or J_tetraminoL_tetraminoZ_tetramino), with very early or late I_tetramino, you can set up a horizontal box and do a Z_tetramino spin. Note that J_tetramino can be spun in after L_tetramino also. Note again that I_tetramino needs to come early to be placed at the bottom or late to be placed at the top. If I_tetramino doesn't come late enough, there exists this thing, but it leads to a different board state and you'll have to freestyle after it.
For Z_tetramino before J_tetramino and L_tetramino, for early I_tetramino or late S_tetramino, you can do a horizontal box and 180 the L_tetramino.
For Z_tetraminoJ_tetraminoL_tetramino, with late I_tetramino, you can do a vertical box and tuck the J_tetramino.
For Z_tetraminoJ_tetramino and very late L_tetramino, you can do this dono and place L_tetramino after the TSD.

85% is NOT 100% so there ARE cases where you simply will not be able to build the box and TSD and will have to take another path.


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Bag 3 STSD path, you just build the STSD with S_tetraminoZ_tetramino and an L_tetraminoO_tetraminoJ_tetramino box. Fallback path uses an L_tetraminoJ_tetramino congruency dono. Note that the STSD can fail with garbage in col 3.
Finesse tips for awkward placements:
Fallback path, Z_tetramino after S_tetramino: this gif helps.
STSD path late Z_tetramino: ccw, sd, cw.
For the vert I field, STSD is not 100%. Some STSD builds are included here (some questionable), hitting ~85-95%. For something guaranteed, a J_tetramino > Z_tetramino and Z_tetramino > J_tetramino set is included.


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Bag 4 STSD path, you can set up for 5 bag PC loop with an O_tetraminoS_tetraminoZ_tetramino congruency, or you can set up for mech TSD. Fallback path has various branching builds from here.
With hold, O_tetraminoS_tetraminoZ_tetramino ball can be built on any queue. If you want to keep bag3 T_tetramino in hold to send the STSD in a combo, it may not.
You can also start freestyle stacking to downstack opponent garbage, or you can start upstacking 3-6. Followups include more STSD, or mech TSD setup. Two mech TSD setups are provided here with 74% cumulative cover.

Bag 4 fallback path, there are various somewhat freestyle 7-2 upstack paths. Examples here are WIP; see more on the KR wiki.


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Bag 5 STSD PC path, there are 5 minimals with a 91.9% PC chance.
Some tips for learning these solutions:
In the well, all solutions use T_tetramino skim into S_tetramino skim, L_tetramino skim into S_tetramino skim, or Z_tetramino skim into S_tetramino skim. So if you have relatively early S_tetramino and can take these two skims unobstructed, you have PC.
The sides are filled in with O_tetramino on the left on 4 of the solutions and J_tetraminoI_tetramino on the right on 3 of the solutions. There's also the less common L_tetramino on the right in 2 of the solutions.
If you can do the skims in the well and fill in the sides, the rest of the solution is usually intuitive. If you don't see early S_tetramino, sometimes you can skim the top away but you may want to just transition to freestyle.

Bag 5 mech TSD path: complete the S_tetraminoL_tetramino chipped tooth and start the mech TSD pattern. Path a has 63.33% success; Path b has 50% succcess. If bag 5 is successful the rest of the 20TSD is 100% guaranteed. See this video for a demonstration.

Bag 5 fallback path you generally just freestyle.


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Bag 6+ mech TSD path. Um, you follow the mech v2 pattern.


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