TGM randomizer: Difference between revisions
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Most games in [[TGM series|Arika's ''Tetris The Grand Master'' series]] randomize the order of [[tetromino]]es using an algorithm that makes successive identical tetrominoes less common. The system involves keeping a history of the most recent tetrominoes and trying to choose a random tetromino not in the history. | Most games in [[TGM series|Arika's ''Tetris The Grand Master'' series]] randomize the order of [[tetromino]]es using an algorithm that makes successive identical tetrominoes less common. The system involves keeping a history of the most recent tetrominoes and trying to choose a random tetromino not in the history. | ||
== | == ''Tetris The Grand Master'' == | ||
In ''[[TGM]]'' he system involves keeping a history of the four most recent tetrominoes and trying to choose a random tetromino not in the history. The state of the history is initialized to a fixed state of [Z, Z, Z, Z]. The four-piece history is not necessarily a unique list. If the randomizer fails to generate a non-recent tetromino, which happens about 3.5 percent of the time in a 6-try system, then two or more of the same tetromino may occupy elements of the history. | |||
Each time a piece is generated, the game will try '''4''' times to generate a tetromino that doesn't match any in the history; if all tries fail and generate a recent piece, the game will settle with that recent piece. The overall effect is to minimize several of the same tetromino showing up in succession, while maintaining a certain amount of unpredictability. | Each time a piece is generated, the game will try '''4''' times to generate a tetromino that doesn't match any in the history; if all tries fail and generate a recent piece, the game will settle with that recent piece. The overall effect is to minimize several of the same tetromino showing up in succession, while maintaining a certain amount of unpredictability. | ||
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The game never deals an S, Z or O as the first piece, to avoid a forced overhang. | The game never deals an S, Z or O as the first piece, to avoid a forced overhang. | ||
== | == ''Tetris The Absolute The Grand Master 2'' == | ||
''[[TGM2]]''<nowiki>'</nowiki>s randomizer works the same as in ''TGM'', but with a few changes: | |||
*In TGM2 (and | *In ''TGM2'' (and ''TAP''), the game will try '''6''' times to generate a tetromino that doesn't match any in the history. | ||
*In TGM2 (and | *In ''TGM2'' (and ''TAP''), the history begins with a Z,Z,S,S sequence. However, as the first piece of the game overwrites the first Z rather than pushing off the last S, this is effectively a Z,S,S,Z or Z,S,Z,S sequence. | ||
== | == ''Tetris The Grand Master 3 Terror-Instinct'' == | ||
Unlike ''TGM1'' and ''TA'' (''P''), ''Ti'' uses a [[bag]] of 35 pieces to draw from rather than drawing uniformly randomly from the seven pieces (while performing history checking). The bag initially contains 5 of each piece. | Unlike ''TGM1'' and ''TA'' (''P''), ''[[Ti]]'' uses a [[bag]] of 35 pieces to draw from rather than drawing uniformly randomly from the seven pieces (while performing history checking). The bag initially contains 5 of each piece. | ||
However, unlike a true bag (which slowly empties with each drawn piece before being completely refilled), ''Ti'''s random generator puts a copy of the least recent piece back into the bag each time a piece is taken out. While the TGM randomizer naturally prevents "floods" (many of the same piece in a row), this additional behavior has the effect of preventing "droughts" (where a certain piece fails to show up for a long time). At an extreme, it is impossible for any piece to fail to appear for longer than a 35-piece sequence. | However, unlike a true bag (which slowly empties with each drawn piece before being completely refilled), ''Ti'''s random generator puts a copy of the least recent piece back into the bag each time a piece is taken out. While the TGM randomizer naturally prevents "floods" (many of the same piece in a row), this additional behavior has the effect of preventing "droughts" (where a certain piece fails to show up for a long time). At an extreme, it is impossible for any piece to fail to appear for longer than a 35-piece sequence. | ||
This is not a perfect description of ''Ti'''s randomizer; for full elaboration including some subtle bugs in the algorithm, see the reference link below. | This is not a perfect description of ''Ti'''s randomizer; for full elaboration including some subtle bugs in the algorithm, see the reference link below. | ||
== | == ''Tetris The Grand Master Ace'' == | ||
Ace uses the "7-bag" [[Random Generator]] algorithm to comply with the Tetris guideline, but slightly modified so that it also never deals an S, Z or O as the first piece. | ''[[Ace]]'' uses the "7-bag" [[Random Generator]] algorithm to comply with the Tetris guideline, but slightly modified so that it also never deals an S, Z or O as the first piece. | ||
== | == ''Tetris The Grand Master 4 Absolute Eye'' == | ||
''TGM4'' presents multiple different randomizer methods, depending on modes and the ruleset used: | ''[[TGM4]]'' presents multiple different randomizer methods, depending on modes and the ruleset used: | ||
=== Standard === | === Standard === | ||
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== References == | == References == | ||
*[https://web.archive.org/web/20151107011715/http://tetrisconcept.net/wiki/User:Zzymyn#Random-Number_Generator Disassembly of the TAP randomizer] | *[https://web.archive.org/web/20151107011715/http://tetrisconcept.net/wiki/User:Zzymyn#Random-Number_Generator Disassembly of the ''TAP'' randomizer] | ||
*[http://tetrisconcept.net/threads/randomizer-theory.512/page-9#post-55478 Ti randomizer explanation] | *[http://tetrisconcept.net/threads/randomizer-theory.512/page-9#post-55478 ''Ti'' randomizer explanation] | ||
**[https://tetrisconcept.net/threads/randomizer-theory.512/page-12#post-65418 Ti randomizer commented C code] including cause of bug | **[https://tetrisconcept.net/threads/randomizer-theory.512/page-12#post-65418 ''Ti'' randomizer commented C code] including cause of bug | ||
Revision as of 23:22, 1 April 2025
Most games in Arika's Tetris The Grand Master series randomize the order of tetrominoes using an algorithm that makes successive identical tetrominoes less common. The system involves keeping a history of the most recent tetrominoes and trying to choose a random tetromino not in the history.
Tetris The Grand Master
In TGM he system involves keeping a history of the four most recent tetrominoes and trying to choose a random tetromino not in the history. The state of the history is initialized to a fixed state of [Z, Z, Z, Z]. The four-piece history is not necessarily a unique list. If the randomizer fails to generate a non-recent tetromino, which happens about 3.5 percent of the time in a 6-try system, then two or more of the same tetromino may occupy elements of the history.
Each time a piece is generated, the game will try 4 times to generate a tetromino that doesn't match any in the history; if all tries fail and generate a recent piece, the game will settle with that recent piece. The overall effect is to minimize several of the same tetromino showing up in succession, while maintaining a certain amount of unpredictability.
The game never deals an S, Z or O as the first piece, to avoid a forced overhang.
Tetris The Absolute The Grand Master 2
TGM2's randomizer works the same as in TGM, but with a few changes:
- In TGM2 (and TAP), the game will try 6 times to generate a tetromino that doesn't match any in the history.
- In TGM2 (and TAP), the history begins with a Z,Z,S,S sequence. However, as the first piece of the game overwrites the first Z rather than pushing off the last S, this is effectively a Z,S,S,Z or Z,S,Z,S sequence.
Tetris The Grand Master 3 Terror-Instinct
Unlike TGM1 and TA (P), Ti uses a bag of 35 pieces to draw from rather than drawing uniformly randomly from the seven pieces (while performing history checking). The bag initially contains 5 of each piece. However, unlike a true bag (which slowly empties with each drawn piece before being completely refilled), Ti's random generator puts a copy of the least recent piece back into the bag each time a piece is taken out. While the TGM randomizer naturally prevents "floods" (many of the same piece in a row), this additional behavior has the effect of preventing "droughts" (where a certain piece fails to show up for a long time). At an extreme, it is impossible for any piece to fail to appear for longer than a 35-piece sequence.
This is not a perfect description of Ti's randomizer; for full elaboration including some subtle bugs in the algorithm, see the reference link below.
Tetris The Grand Master Ace
Ace uses the "7-bag" Random Generator algorithm to comply with the Tetris guideline, but slightly modified so that it also never deals an S, Z or O as the first piece.
Tetris The Grand Master 4 Absolute Eye
TGM4 presents multiple different randomizer methods, depending on modes and the ruleset used:
Standard
TGM
Konoha
References
- Ti randomizer explanation
- Ti randomizer commented C code including cause of bug
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