Haubrich Puzzle Auction
Haubrich Puzzle Auctions
Auction Rules
(
Refined per July 23, 2016
)
Puzzle Auction 25: scheduled for August 26, 2017
Checkerboard
history
Covering surfaces
with pentominoes
It is now Thursday, August 17, 2017 - Time: 13:25 (PM) (Amsterdam time)