On Dec 19, 2007 3:08 AM, Ben Lambrechts <[EMAIL PROTECTED]> wrote: > Hi all, > > I am planning a fuseki database. > Now I got the following problem: how to rotate/mirror the board for a > unique representation. > > $$c > $$ +---------------------------------------+ > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . O . . . . . , . . . . . X . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . , . . . . . , . . . . . , . . . | > $$ | . . . . . . . . . . . . . . . . 5 . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . O . . . . . , . . . . . , . . . | > $$ | . . . . . . . . . . . . . . . X . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ +---------------------------------------+ > > $$c > $$ +---------------------------------------+ > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . 5 . . . . . . . . . . | > $$ | . . X , . . . . . , . . . . . X . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . , . . . . . , . . . . . , . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . O . . . . . , . . . . . O . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ | . . . . . . . . . . . . . . . . . . . | > $$ +---------------------------------------+ > > Both are the same board, but has anyone made an algorithm that rotates > the board or an area of the board in a unique way? > I don't need the move order, just the "snapshot" of the board.
You can compute all rotated versions of the board (8 of them) and pick the minimum, in some sense. For instance, you can compare boards lexicographically, or you can compute a zobrist key and pick the minimum of that. Does that help? Álvaro.
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