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Someone
on Jan 11, 2016
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The Mathematics of Tetris (2011)
I guess you are thinking of other orientations than straight up, as it is trivial to clear three lines with a T-piece:
.....TTT.. ......T... ......T... ..........
zeeboo
on Jan 11, 2016
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That's not a T piece. It has 5 blocks. The subtlety is about a board like
.XXXXXXXXX ..XXXXXXXX .XXXXXXXXX
and if you can put a T piece inside of the gap on the left.
Someone
on Jan 11, 2016
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Oops. My mind is more pentomino-oriented, I guess.
JoshTriplett
on Jan 11, 2016
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All seven pieces ("tetrads", from "tetromino") in standard tetris have 4 blocks, not 5.
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