PC-Spin (Okey Version)

PC-Spin (Okey Version) is an Opener resulting in a T-Spin Triple in the second bag, followed by a T-Spin Single or a T-Spin Double in the third bag whereas there is also a good chance to finish this bag with a Perfect Clear.

The Setup (first two bags)
This setup was proposed by the player Okey_Dokey and it resembles the 8th row version of PC-Spin whereas that name originates from a wordplay between PC, short for Perfect Clear, and C-Spin, an alternative name for the Triple Double Attack technique. It can be used for both J & L starts as well as J & S starts and is thus a good alternative to MKO Stacking and the standard DT Cannon opener. The first bag is stacked in exactly the same way as in the standard 8th row PC-Spin setup - except for the I piece which is placed vertically one column away from the left wall. In the second bag the player must pay attention to the order in which the O and J pieces show up. In any case, a T-Spin Triple is executed at the end of the second bag which immediately prepares a T-Spin Single for the third bag.

If O comes before J, then the second bag can always be stacked like this (this is the preferred way):

And if J comes before O, then the second bag can always be stacked like this (it may require a J-Spin if J comes after S and T):

O before J (third bag)
The case O before J offers a 95.9 % chance to get a PC in the third bag, or 71.2 % if requiring a T-Spin Single beforehand (and 48.7 % if requiring a TSD).

The 71.2 % chance for TSS -> PC can be achieved by using these 14 PC solutions ([https://harddrop.com/fumen/?m115@zgC8i0zhC8Rpg0BthlC8RpB8BtglB8ywD8glC8wwF8?JeAg0WAxckAAAQ78A4sIwA3ngHBFr4AAAAAAA4ggWyhDeQp?whhWQawhQaCeQpwhBeSaIeQaTeAAtVAYYAAAgnoRByC45AF?rnRAylAAAAAAAA2gBPgWxhAtDeAPRpwhAeQpDewhQpBeRpe?eAAtVAYYAAAgnoRBS+HOBFrnRAylAAAAAAAA2gDtQaAPDew?hAPQaBtAPDeBPBewhAPeeAAtWAR4oAAAQ78A4s2vAzngHBF?r4AAAAAAA4ggWGeQpwhgWGeQpwhieAAtVAWYAAAgnoRBy53?5AFrnRAylAAAAAAAA2gBPgWQaBtDeAPRpxSAtDewhQpBewS?gleeAAe3gxhHeBPGeRLieAAe2gCtSLDeAtRpBeAPwhCexwD?ewhIewhTeAAtVATbAAAgnoRBR7/DBFrnRAylAAAAAAAA3gQ?awSyhEeiWQawhQaCegWwSBeSaIeQaCewhPeAAtVAQAAAAFb?22AOo78A1nAVBg36ACAAAAA3gwhQpHehlGeglQpReQaPeAA?tVATYAAAgnoRBR7/DBFrnRAylAAAAAAAA2gwSAPQLCtDeCP?glwhQpDeBPBexheeAAtVAUbAAAgnoRBRBg2AFrnRAylAAAA?AAAA2gQpAtwwhWAPDeCthWAPDeBtieAAtWASeAAAgnoRBZl?nRAyv78AZQTABmAAAA3gQawSRaAewhDehWxhwwg0CeQawSB?eRpwhIewhTeAAtUASYAAAgnoRBZlnRAyv78AZAAAA7gxwHe?RLneAAe2gBPgWQpAeAPgHCeAPTpAtQaCewhQpBeBPQaIeQa?TeAAtWASYAAAgnoRBZlnRAyv78AZQTABmAAAA2gBtglwhRa?DeAtxSxhAPDegWwSBeAtQaNewhPeAAtVAQAAAAFb22AOo78?A1nAVBg36ACAAAAA3gwhQpwSglAewhDehlhHQaDeglQpBew?SglwhIewhCeQaPeAAtWARkAAAgnoRBX1pRAyv78AZQTABmA?AAA2gwSAPQahlEeSLAewwh0CeBPBeRpeeAAtVAShAAAgnoR?Bx5vKBFrnRAylAAAAAAAA2gRpgWxSEewwRpglwSgWQLCeBt?BehWQpBehlQaHewhPeAAtVAQAAAAFb22AOo78A1nAVBg36A?CAAAAA5gRaAeQaFeQaAegWQaGehWAPIeQaTeAAe2gBPgWxh?AtDeQayhAeQpHeRpEewhHeAPPeAAe2gCtxhAPDehWwhRaAP?DeBPBehWCehWIeQpPeAAtWASYAAAgnoRBZlnRAyv78AZQTA?BmAAAA2gCPhlAtDehlQahlAtDeBtGehlIewSPeAAtVAQAAA?AFb22AOo78A1nAVBg36ACAAAAA2gxhAtBewhg0CeCPwSglA?PwhCeBPBeRpwhBehWEewhCeQpPeAAtUAxiAAAgnoRBYlwRA?yv78AZAAAA2gRpAehWRLCehlwwAeQLRaGexSeeAAtVAYAAA?AFbWEBO078A1nAVBg36ACAAAAA all solutions]):

If the T piece shows up among the first 2 pieces of the third bag, then it's always possible to achieve a PC after starting the bag with a T-Spin Single.

The 95.9 % chance for just PC can be achieved by using these 4 PC solutions additionally ([https://harddrop.com/fumen/?m115@zgC8i0zhC8Rpg0BthlC8RpB8BtglB8ywD8glC8wwF8?JeAg0WAxckAAAQ78A4sIwA3ngHBFr4AAAAAAA4ggWyhDeQp?whhWQawhQaCeQpwhBeSaIeQaTeAAtWAR7oAAAQ78A4sIwA2?ngHBFr4AAAAAAA2gBPgWxhAtDeAPRpwhAeQpDewhQpBeRpe?eAAtWARbkAAAQ78A4s/vA3ngHBFr4AAAAAAA2gDtQaAPDew?hAPQaBtAPDeBPBewhAPeeAAtWAR4oAAAQ78A4s2vAzngHBF?r4AAAAAAA4ggWGeQpwhgWGeQpwhieAAtVAZYAAAgnoRBT43?UBFrnRAylAAAAAAAA2gBPgWQaBtDeAPRpxSAtDewhQpBewS?gleeAAe3gxhHeBPGeRLieAAtXAWYAAAgnoRBy535AFrnRAy?l4QAT5AAA2gCtSLDeAtRpBeAPwhCexwDewhIewhTeAAtVAU?hAAAgnoRBxCwKBFrnRAylAAAAAAAA3gQawSyhEeiWQawhQa?CegWwSBeSaIeQaCewhPeAAtXAUbAAAgnoRBx/vKBFrnRAyl?4QAT5AAA3gwhQpHehlGeglQpReQaPeAAtVAUbAAAgnoRBxC?oABFrnRAylAAAAAAAA2gwSAPQLCtDeCPglwhQpDeBPBexhe?eAAtXAUbAAAgnoRBRBg2AFrnRAyl4QAT5AAA2gQpAtwwhWA?PDeCthWAPDeBtieAAtXAThAAAgnoRBR+nABFrnRAyl4QAT5?AAA3gQawSRaAewhDehWxhwwg0CeQawSBeRpwhIewhTeAAtV?ATbAAAgnoRBx/35AFrnRAylAAAAAAAA7gxwHeRLneAAe2gB?PgWQpAeAPgHCeAPTpAtQaCewhQpBeBPQaIeQaTeAAtXATbA?AAgnoRBx/35AFrnRAyl4QAT5AAA2gBtglwhRaDeAtxSxhAP?DegWwSBeAtQaNewhPeAAtXATYAAAgnoRBR7/DBFrnRAyl4Q?AT5AAA3gwhQpwSglAewhDehlhHQaDeglQpBewSglwhIewhC?eQaPeAAtXATYAAAgnoRBR7vKBFrnRAyl4QAT5AAA2gwSAPQ?ahlEeSLAewwh0CeBPBeRpeeAAtXAShAAAgnoRBx5vKBFrnR?Ayl4QAT5AAA2gRpgWxSEewwRpglwSgWQLCeBtBehWQpBehl?QaHewhPeAAtVASeAAAgnoRBR4f2AFrnRAylAAAAAAAA5gRa?AeQaFeQaAegWQaGehWAPIeQaTeAAtVASeAAAgnoRBR4P9AF?rnRAylAAAAAAAA2gBPgWxhAtDeQayhAeQpHeRpEewhHeAPP?eAAtUASbAAAgnoRBZVcRAyv78AZAAAA2gCtxhAPDehWwhRa?APDeBPBehWCehWIeQpPeAAtWASYAAAgnoRBZlnRAyv78AZQ?TABmAAAA2gCPhlAtDehlQahlAtDeBtGehlIewSPeAAtUARk?AAAgnoRBYFjRAyv78AZAAAA2gxhAtBewhg0CeCPwSglAPwh?CeBPBeRpwhBehWEewhCeQpPeAAtWAxiAAAgnoRBYlwRAyv7?8AZQTABmAAAA2gRpAehWRLCehlwwAeQLRaGexSeeAAtVAYA?AAAFbWEBO078A1nAVBg36ACAAAAA all solutions]):

Here are some placements of 2 pieces that guarantee the Perfect Clear - no matter in which order the other pieces show up. There's a 38.10 % chance that one of these can be applied (or 9.5 % if requiring a TSD additionally). (all 2-piece placements)

Here are some placements of 3 pieces that guarantee the Perfect Clear - no matter in which order the other pieces show up. If including the placement of 2 pieces from above, then there's a 55.5 % chance that one of these can be applied, or 47.9 % if requiring a T-Spin Single additionally (or 20.2 % if requiring a TSD additionally). (all 3-piece placements)

Here are some placements of 4 pieces that guarantee the Perfect Clear - no matter in which order the other pieces show up. If including the placement of 2 and 3 pieces from above, then there's a 68.6 % chance that one of these can be applied, or 63.8 % if requiring a T-Spin Single additionally (or 38.6 % if requiring a TSD additionally). (all 4-piece placements)

J before O (third bag)
The case J before O offers a 96.9 % chance to get a PC in the third bag, or 65.1 % if requiring a T-Spin Single beforehand (and 39.0 % if requiring a TSD).

The 65.1 % chance for TSS -> PC can be achieved by using these 11 PC solutions ([https://harddrop.com/fumen/?m115@zgC8RpzhglC8RpBtilC8i0BtD8ywg0G8wwF8JeAg0W?AxJ0AAAQ78A4c9vAwngHBFr4AAAAAAA2gRpwwCeQaEeglGe?xSgWAegWGegWXeAAtVAZYAAAgnoRBSEoABFrnRAylAAAAAA?AA2gxSwhIewhQpFeRpglQpHeglXeAAtVA3fAAAgnoRBS+3U?BFrnRAylAAAAAAAA2gRpgHCewhCeQpAtxSGexhwSglGewhX?eAAtVAUeAAAgnoRBxCoABFrnRAylAAAAAAAA4gCtglwhEeQ?pwhAexhCewhAeQLhWDeCPgHGewhPeAAtVAQAAAAFb22AOo7?8A1nAVBg36ACAAAAA2ghWglxSFeQaAeglFeQawSglwwgeAA?e2ghlIeQaHeQaxhheAAe3gwhIewhQawSFehlQawSEeCtQpG?eQaPeAAtVAUYAAAgnoRBR+nABFrnRAylAAAAAAAA3gQaHeh?WwhQpFeQawSAeQpEeCPwSGewhPeAAtVAQAAAAFb22AOo78A?1nAVBg36ACAAAAA3gwhAeRahWCehlQawSAeRaCewhQpAewS?EeCtQpGeQaPeAAtXASkAAAgnoRBx5vKBFrnRAyl4QAT5AAA?2gQLhHAewwhlCehWwhQpAtxhCegWwSAeglAtFeglQpXeAAt?VATeAAAgnoRBx8f2AFrnRAylAAAAAAAA2gCtg0whEehlBeA?PEexhgWBPDeBPhHGewhPeAAtVAQAAAAFb22AOo78A1nAVBg?36ACAAAAA2gzSQaRpCezSwwAtQpCewSgWglxwOeAPPeAAe2?gSawSxhAPEehlRLAPEeglFeCtwwGeQpPeAAtVASkAAAgnoR?Bx535AFrnRAylAAAAAAAA2gxwBehHDeQpAewSQaFeBtQahW?DehlgWwSGewhPeAAtVAQAAAAFb22AOo78A1nAVBg36ACAAA?AA4gg0CtDegWwhAtglFeQawSQaglEehHhWXeAAe2ghWHehl?seAAe2ghlwSQawSgWwhDewhRLAexhDeRpwSQaDeCtg0GeQa?PeAAtUAxfAAAgnoRBX1pRAyv78AZAAAA2gRLxSAtEegWwSx?wAtEeQaBehlFeQawSXeAAtUASbAAAgnoRBZlnRAyv78AZAA?AA2gRpxwFewhAewSAewhFegWAewhEeBPxSXeAAtVAQAAAAF?b22AOo78A1nAVBg36ACAAAAA2ghWAPxhEewSAeglRaEeRaR?eQaPeAAe2gSpwSAeAtQaCeAtglhWAPRaCeglwhwSAewhOeg?lPeAAe2gxhAPwShHEewhHeQaglQpxSDeCtg0XeAAe2ghWh0?wwglwhCeQLgHxSAtxhFehlFeQawSGeQaPeAAtUAxZAAAgno?RBWVcRAyv78AZAAAALhxSHeRpXeAAe2ghlxSAPEeCtQpgWE?exhgWBPDeBPhHGewhPeAAtVAQAAAAFb22AOo78A1nAVBg36?ACAAAAA4gRawwAtQaCeRagWQagWRaDeQaglxwfeAAe all solutions]):

Note that here the T-Spin is sometimes required to be vertical, in which case either J piece or L will stay on hold instead of S, Z, O or I.

The 96.9 % chance for just PC can be achieved by using these 9 PC solutions additionally ([https://harddrop.com/fumen/?m115@zgC8RpzhglC8RpBtilC8i0BtD8ywg0G8wwF8JeAg0W?ARb2AAAQ78A4cGwA3ngHBFr4AAAAAAA2gRpwwCeQaEeglGe?xSgWAegWGegWXeAAtVAZYAAAgnoRBSEoABFrnRAylAAAAAA?AA2gxSwhIewhQpFeRpglQpHeglXeAAtVA4iAAAgnoRBT4f2?AFrnRAylAAAAAAAA2gRpgHCewhCeQpAtxSGexhwSglGewhX?eAAtVA4ZAAAgnoRBT4nABFrnRAylAAAAAAAA4gCtglwhEeQ?pwhAexhCewhAeQLhWDeCPgHGewhPeAAtVAXbAAAgnoRBy8f?2AFrnRAylAAAAAAAA2ghWglxSFeQaAeglFeQawSglwwgeAA?tVAWYAAAgnoRBxFg2AFrnRAylAAAAAAAA2ghlIeQaHeQaxh?heAAtVAVeAAAgnoRBxCgRBFrnRAylAAAAAAAA3gwhIewhQa?wSFehlQawSEeCtQpGeQaPeAAtVAVbAAAgnoRBxFg2AFrnRA?ylAAAAAAAA3gQaHehWwhQpFeQawSAeQpEeCPwSGewhPeAAt?XA0fAAAgnoRBx/P9AFrnRAyl4QAT5AAA3gwhAeRahWCehlQ?awSAeRaCewhQpAewSEeCtQpGeQaPeAAtXAziAAAgnoRBx/H?OBFrnRAyl4QAT5AAA2gQLhHAewwhlCehWwhQpAtxhCegWwS?AeglAtFeglQpXeAAtVATeAAAgnoRBx8f2AFrnRAylAAAAAA?AA2gCtg0whEehlBeAPEexhgWBPDeBPhHGewhPeAAtXATYAA?AgnoRBR7/DBFrnRAyl4QAT5AAA2gzSQaRpCezSwwAtQpCew?SgWglxwOeAPPeAAtVATYAAAgnoRBR7/DBFrnRAylAAAAAAA?A2gSawSxhAPEehlRLAPEeglFeCtwwGeQpPeAAtVASkAAAgn?oRBx535AFrnRAylAAAAAAAA2gxwBehHDeQpAewSQaFeBtQa?hWDehlgWwSGewhPeAAtVASeAAAgnoRBR4f2AFrnRAylAAAA?AAAA4gg0CtDegWwhAtglFeQawSQaglEehHhWXeAAtWASeAA?AgnoRBZlnRAyv78AZQTABmAAAA2ghWHehlseAAtUASeAAAg?noRBZlnRAyv78AZAAAA2ghlwSQawSgWwhDewhRLAexhDeRp?wSQaDeCtg0GeQaPeAAtVAycAAAgnoRBR7f2AFrnRAylAAAA?AAAA2gRLxSAtEegWwSxwAtEeQaBehlFeQawSXeAAtUASbAA?AgnoRBZlnRAyv78AZAAAA2gRpxwFewhAewSAewhFegWAewh?EeBPxSXeAAtUASYAAAgnoRBZlnRAyv78AZAAAA2ghWAPxhE?ewSAeglRaEeRaReQaPeAAe2gSpwSAeAtQaCeAtglhWAPRaC?eglwhwSAewhOeglPeAAtUARhAAAgnoRBXleRAyv78AZAAAA?2gxhAPwShHEewhHeQaglQpxSDeCtg0XeAAtWARbAAAgnoRB?WFsRAyv78AZQTABmAAAA2ghWh0wwglwhCeQLgHxSAtxhFeh?lFeQawSGeQaPeAAtWAxZAAAgnoRBWVcRAyv78AZQTABmAAA?ALhxSHeRpXeAAtUAxZAAAgnoRBWVcRAyv78AZAAAA2ghlxS?APEeCtQpgWEexhgWBPDeBPhHGewhPeAAtVAYAAAAFbWEBO0?78A1nAVBg36ACAAAAA4gRawwAtQaCeRagWQagWRaDeQaglx?wfeAAe all solutions]):

Here are some placements of 3 pieces that guarantee the Perfect Clear - no matter in which order the other pieces show up. There's a 41.0 % chance that one of these can be applied, or 30.0 % if requiring a T-Spin Single additionally (or 12.1 % if requiring a TSD additionally). (all 3-piece placements)

Here are some placements of 4 pieces that guarantee the Perfect Clear - no matter in which order the other pieces show up. If including the 3-piece placements from above, then there's a 79.2 % chance that one of these can be applied, or 53.9 % if requiring a T-Spin Single additionally (or 30.0 % if requiring a TSD additionally). (all 4-piece placements)

Late T Piece (third bag)
If T piece comes late in second bag, it may be best to ignore the PC solutions entirely, and just stack a little up to get a T-Spin Double with back-to-back bonus. However, the PC solutions with a missing O piece offer an alternative route: Burn some lines, use the O piece to create an overhang, and then perform a T-Spin Double without back-to-back bonus - resulting in an almost empty playfield.

The PC solutions with a missing Z piece can be used in a similar way. However, this creates a hole on the left wall. It may still be useful when receiving garbage with its holes on the other side.