Hi!
In most papers I've read, three-valued Zobrist hashes are used - per
intersection, values for "empty", "black" and "white" coloring [1].
I'm not clear on why is the "empty" value needed, however, shouldn't
only "black", "white" values work just fine? Is the hash behaving better
with extra values for empty intersections? Has anyone measured it?
[1] In pattern-matching, it is desirable to also use "edge" coloring.
Thanks,
Petr "Pasky" Baudis
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