Ovyron wrote:It seems the Persistent Hash implementation is bugged and it ignores the "Play Depth" parameter, so make it 4 more bugs.
Has this been mentioned on the Rybka forum anywhere? I tried a 60'+0
game from a set position between two of the personalities, each with
its own persistant hash file and default parameters for this.
After playing I restarted a new game from the same position and it
played out most of the same game very quickly. I've also noticed
it sometimes instant plays moves for several moves in a row
(this is with pers. hash off) which can't be good.
Hi Dan, thanks for testing !
75% of the responses of your question about alteratives move are here http://home.scarlet.be/vincentlejeune/h ... -beta3.pgn , follow the main line and you should see a better score than the Rybka3 move, for the other 25% , I investigate.
Very interesting test suite, I love hard problems and a bunch of these are really cool. I have looked at several of the positions (from beta 1, since I downloaded it about 2 weeks ago and have not had internet access again until recently.). Here are three of them that I think might be flawed:
[D]8/5k2/p7/2pP1Pp1/2P3P1/2N3K1/P4N2/5q2 b - - 0 1
1... Kf8 (1... Qxc4 ? 2.Nfe4 {Draw} [R.S.: I don't think it is a draw, for example Black can now play 2... Kf8 3.Kf2 Qd4+ 4.Kf3 c4 and the black queen will eventually work its way over to f4, pick off the g4 pawn, with an eventual win)]
[D]6k1/4pp1p/3p2p1/7n/p3P3/r4P2/P1PK2P1/1R5R w - - 0 1
1.Rxh5 gxh5 2.Rb2
[R.S.:I think there are other ways for White to also trap and win the a3 rook, for example 1.Rb8+ Kg7 2.Ra1 or simply 1.Rb2 both should also eventually win the rook with an easy win for White.]
[D]8/8/7p/3KNN1k/2p4p/8/3P2p1/8 w - - 0 1
1.Kc6! (1.Ng7+ Kg5 2.Nf3+ Kg4 3.Nf5 [R.S.: I think white can probably also draw with 3.Ke4 h3 4.Nf5 g1=Q 5.Nxg1 h2 6.Nxh6+ Kh5 7.Nf3 h1=Q 8.Nf5 for example: 8...Kg4 9.Ne3+ Kg3 10.Nf5+ Kf2 11.N5d4 and Black cannot make progress.]
Andrew wrote:Has this been mentioned on the Rybka forum anywhere?
Yes, with Play Depth = 64 Rybka should not be playing instantly at all. When Vas is online he's very responsive and replied to all of my post, perhaps he's looking in the issue (Rybka 3.1 anyone?)
