Richard Vida posts
Strelka 5.5 has a database of best-moves stored in the executable file
for many popular test positions. (29643 positions in total).
When it reaches depth 5 in such position, it excludes all other moves and searches only the stored best-move.
Miguel A. Ballicora posts
In the 90's this could have been considered serious cheating (when
people judged engines based on the ability to solve problems). And that
was the reason why many testers kept their positions secret.
Are those positions flipped north/south west/east? What if a useless pawn is added?
Miguel
Richard Vyda posts
Positions are stored as hash keys. No flipping, no mirroring.
example:
rn1qr1k1/1p2bppp/p3p3/3pP3/P2P1B2/2RB1Q1P/1P3PP1/R5K1 w - - bm Bxh7+; id "01. Polugaevsky-Torre (London) 1984";
Strelka outputs Bxh7 at depth 6 with a huge negative score. Only at depth 16 it starts to see the move is winning.
Another one:
r3k2r/2q1b1pp/pp2p3/2pR4/P7/4BP2/1PP1Q1PP/5RK1 w kq - bm Bf4; id "arasan13.30"; c0 "Rozentalis-Dokhoian, USSR 1986";
again, Bf4 at depth 6 with much lower score than Rd3 at depth 5.
If these positions are flipped, it takes much much more plies to find the solutions
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Richard posts
Here is a patched version with its internal database disabled:
[You must be registered and logged in to see this link.] I hex-edited the binary.
Playing strength shouldn't be affected (I patched only 2 bytes in DB probing code).
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