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Michael Poplawski wrote:
For whatever it's worth, Scrabble permits exchanging as long as there are seven or more tiles left in the bag. The corollary for Qwirkle would be six tiles.
I would agree here. The Scrabble rule is there so that somebody who has seemingly unplayable tiles by the end can't just dump them back into the bag for the next player to obviously draw during the final draw from the bag. Same would apply to Qwirkle.
In addition, there has to be a time when the redraw action is no longer available or the game could easily loop.