How much CPU time to search through depth 16?
Days and days (but just one thread). Since the patterns were "nearly" solved,
my pruning tables didn't help too much though, and I also don't think I used the
best pruning tables. I think if I use multiple threads and start with more random
positions, I can probably get a few more plies.
I may even be able to contrive a position that is as deep as my pruning tables
go, specifically to try to get an easy position to prove deep.
And if I can ensure the position has enough symmetry, I can probably get a bit
deeper yet.
But my 4x4 code is probably not nearly as advanced or mature as other
posters on this site.