Don Dailey wrote:
Lukasz Lew does something far more sophisticated and very fast using the concept of pseudo liberties which you might want to look into.
Both pseudo liberties as well as disjoint set chain tracking. Curiously enough, they're both things I independently came up with when I was designing HouseBot the first time around, but included neither in the open source version. Pseudo liberties had a very negative response on the computer go mailing list at the time, so I chose something closer to real liberty tracking. When I implementing undo's I figured the disjoint set stuff was too complex and might scare away developers on an open source project (simple, easy to read code is a big plus). I still wonder if I was the original creator of either concept...
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