From wiki
The New Tetris uses smooth falling animation for tetrominoes.
The way this implementation mixes the falling animation with collision detection means that when a tetromino must be moved under an overhang to reach a ledge, by the time it has moved left one space with no support it has dropped more than zero spaces. In some cases it can therefore not reach a ledge.
Nothing can be done in the case of the O piece:
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There is no problem getting the O piece to here
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But if the ledge is further under the overhang we have a problem
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The piece can not move left until this point
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It cannot move left two spaces before it has dropped more than zero spaces
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There are, however, ways of getting a piece other than O further under the overhang by making use of "tactical rotation": rotating the piece in the right direction at the right time.
[edit] Examples
[edit] Reaching under overhangs
[edit] With I pieces
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Just holding left from here won't get the I piece in place
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Hold left and rotate (either direction) just after this point
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As long as the gravity isn't too strong at this point in the game, you'll get to here (or a space above or below)
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Rotate the I piece into place
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[edit] With L and J pieces
This is useful for completing spiral L monosquares on the left and spiral J monosquares on the right (in which case the move is reversed) if the space above the block is already occupied in such a way that the L cannot be overhung as in the second figure of the L/J shuffle below.
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Lower the L in this orientation
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Start to hold left
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