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- Main article: Perfect Clear
In this article, we will list some of the most notable Perfect Clear openers, the most popular being the Perfect Clear Opener.
Perfect Clear Opener
- Main article: Perfect Clear Opener
Conventionally, in games that use the Random Generator, the Perfect Clear Opener is used when a player wants to achieve a Perfect Clear in four lines (10 dropped pieces). The first bag setup consists of two shapes, namely a 4x4 square, made by the I, J, L and O tetrominoes, and a TSZ stack. The Perfect Clear rate is 61.19%.
The first six minimal solutions are as follows:
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11.4%
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7.6%
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7.6%
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7.6%
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7.6%
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7.6%
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Following up after success
If you succeed in making a Perfect Clear from this opener, there is a chance, assuming the S, T and Z pieces were used in the first Perfect Clear, to achieve another PC that clears two more lines (six lines in total), if the O piece is the first or second piece of the third bag. Otherwise, stack the remainder in a way that has a chance to achieve a PC after four lines (eight lines in total).
In a similar situation, if an I, J or L piece was used in the first Perfect Clear, the shapes below can be used. When you still have the O, J and L pieces, the J piece will be placed in different places depending on what pieces came early in the third bag.
For setups where you may place the remainder of the second bag, see PC Opener Continuations. Below is an instance where you used up ZLI or SJI. For the former, use the mirrored version of the below.
Following up after failure
If the attempt to get a Perfect Clear fails, below are some ways you can place the pieces of the second bag from the initial state.
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Tetris → PC (6 lines)
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Tetris → PC (8 lines)
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TSD → PC (6/8 lines)
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TSD
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Incomplete TSD
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Incomplete TST
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Alternatively, you can always make a T-Spin Double after clearing a line with the J piece. This results in a 54.64% Perfect Clear chance and nine solutions (first four shown).
Luna Special
- Main article: Luna special
The Luna Special is a Perfect Clear Opener continuation mainly designed for TETR.IO. It is mainly designed for that game because of its multiplier system; the high combo and Tetris send many lines.
One can always stack the second bag, depending on the order of the O and J pieces. If the L piece comes late, it can be placed by using an L-Spin and sliding it after it touches the ground.
Opener variations
If the I piece from the first bag is kept on hold, there is an 84.6% PC chance to achieve a Perfect Clear. The PC rates where the I piece is placed are also shown.
Mr. Good's Grace System makes the same shape as the Perfect Clear Opener, only shifted by one column to the right. The solutions are the same as the Perfect Clear Opener.
Grace System
This Perfect Clear setup, called Grace System, instead uses a single 6x4 rectangle shape on the left side. The fumen below shows some examples one can make a Perfect Clear, though there are no percentages shown for each solution.
MKO Stacking
MKO Stacking is an opener with a PC chance after any even number of lines, usually 4 or 8 lines, but 6 is also possible. For 4 lines, the Perfect Clear rate is 33.33%.
Line Perfect Clear
It is unknown who invented these openers, but there are two such opners when they invented it, as well as one other opener. All these openers can result in a Tetris Perfect Clear (4 lines) or if it fails, a PC after six lines.
Opener A
Perfect Clear after 4 lines
Opener B
Perfect Clear after 4 lines
Other openers
Both openers are based on opener B.
- Opener C (63.06% setup rate, 33.10% PC rate, 7 minimal solutions): This opener is invented by the same person who invented the two openers above.
- Opener D (67.22% setup rate, 26.43% PC rate, 4 minimal solutions): This opener is invented by Agent 1568AH.
Mountainous Stacking 2
- Main article: Mountainous Stacking
You can always stack this Triple Double opener, if the mirrored opener is also considered. There is a 26.19% chance (220 out of 840) to achieve a Perfect Clear after four lines. The same is also true for Gamushiro Stacking and Rainfall Stacking.
If you cannot make a Perfect Clear, you will always be able to stack a Triple Double Attack; the former setup may have a chance to achieve a Perfect Clear after eight lines (97.94% PC rate). Some Perfect Clear solutions may inlcude a T-Spin Double.
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S → O
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97.94% (4936/5040)
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O → S
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Yamaha Stacking
- Main article: Yamaha Stacking
One of the purposes of Yamaha Stacking is a Perfect Clear after four lines, which has a Perfect Clear rate of 45.71%. The same is true if the whole setup has its components moved around, hence the LSJ rectangle could be shifted to the very right of the playfield, which forms a 4x4 square with the I piece.
If your bag does not allow the purpose above to be possible, you can stack the first bag variation, which depends on the placement of the L, S, J and O pieces. You can try the other purposes shown below, the most powerful being the C-Spin continution, of which the Perfect Clear rate is 99.09% (the same shape you would ideally get in Gamushiro Stacking).
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Tetris → PC
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C-Spin → PC
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TSD → PC
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