Alphazero news

[main line]

I only looked so far for TCEC opening games. AO seems to be sometimes like patzer and loses in 22 moves to outdated SF .

[Event "Computer Match"] [Site "London, UK"] [Date "2018.01.18"] [Round "255"] [White "Stockfish 8"] [Black "AlphaZero"] [Result "1-0"] [PlyCount "43"] [EventDate "2018.??.??"] 1. e4 {book} e6 {book} 2. d4 {book} d5 {book} 3. Nc3 {book} Nf6 {book} 4. Bg5 { book} Be7 {book} 5. e5 {book} Nfd7 {book} 6. h4 {book} Bxg5 {book} 7. hxg5 { book} Qxg5 {book} 8. Nh3 {book} Qe7 {book} 9. Qg4 g6 10. Ng5 h6 11. O-O-O Nc6 12. Nb5 Nb6 13. Rd3 h5 14. Rf3 a6 15. Qg3 Nd8 16. Nc3 Nd7 17. Bd3 Nf8 18. Rh4 Rg8 19. Bc4 Qd7 20. Nce4 dxe4 21. Nxe4 Nh7 22. Rxh5 1-0

And what is this: (Who is patzer here)

http://view.chessbase.com/cbreader/2018 ... 26031.html

[jhellis3]

Well, I am most amused.....

[matthewlai]

Were other settings ever considered, notably 0.5 or parent?

Yes and 0 seems to work best. Assumption being that most positions have 1 or at most a few good moves. All other moves are akin to passing or worse. In most equal-ish positions, passing will give the opponent a big advantage.

[Gian-Carlo Pascutto]

Were other settings ever considered, notably 0.5 or parent?

Yes and 0 seems to work best. Assumption being that most positions have 1 or at most a few good moves. All other moves are akin to passing or worse. In most equal-ish positions, passing will give the opponent a big advantage.

I think this ends up explaining why FPU reductions as implemented by both LZ and lc0 work though

[glennsamuel32]

Hello Matthew, nice to see you back after so long !!

Does this mean Giraffe will get some updates in the future ?

[Dann Corbit]

Hello Matthew, nice to see you back after so long !!

Does this mean Giraffe will get some updates in the future ?

I think giraffe is called "AlphaZero" or "DeepMind" now.

[matthewlai]

Hello Matthew, nice to see you back after so long !!

Does this mean Giraffe will get some updates in the future ?

Thanks!

Afraid not! AlphaZero is taking up all my time these days, and it's a very exciting project with lots of uncharted territory ahead . AlphaZero is basically what I ever wanted Giraffe to become... and then a lot more. I have never been this excited about computer chess my whole life.

[Albert Silver]

Hello Matthew, nice to see you back after so long !!

Does this mean Giraffe will get some updates in the future ?

Thanks!

Afraid not! AlphaZero is taking up all my time these days, and it's a very exciting project with lots of uncharted territory ahead . AlphaZero is basically what I ever wanted Giraffe to become... and then a lot more. I have never been this excited about computer chess my whole life.

Warmest congrats. I find that heartwarming to the extreme.

[yanquis1972]

I am not convinced the newest SF would win against it. The ELO is calculated against a pool of similar engines. It's not clear if 50 or 100 ELO more against this pool is equal to 50-100 ELO more against an opponent of a different type.

While that's true, Lc0 with the best nets on my powerful GPU and average CPU ("Leela Ratio" of say 2.5) beats heavily SF8, but loses slightly to SF10, from regular openings. Against SF8, it's similar to what happens in this paper. My guess is that this particular "old" A0 in those TCEC conditions is somewhat weaker than SF10.
Lc0 needs a "Leela Ratio" of 2.5 to have similar results to A0 ("Leela Ratio" 1 by definition), so Lc0 (with the best nets) is still lagging pretty significantly behind A0.
In some games it becomes apparent that they are fairly similar in playing style, strengths and weaknesses.

but have you tried the deepmind openings? it seems clear that the Zeros lose elo playing prescribed openings. Test30 already has excellent results against SF10 in my tests so far (https://lichess.org/study/FHjaPySh) i would expect the strongest test10 net to score better, but i believe it's gotten very close.

[glennsamuel32]

Matthew, could you divulge the size of the network file that A0 used ?