OliThink 5.4.0 has been published with an big leap in strength for only 3 lines of code

[OliverBr]

It would be nice if you put your home page link in your sig.
Then old guys like me could remember where to look.

Can you please navigate me to the section where I can write my signature?
PS: 5.4.8 is out

Step 1:

Step 2:

Ah, it's "User Control Panel": Thank you!

[OliverBr]

OliThink 5.4.9 is released (http://brausch.org/home/chess).

When self-playing it's a big improvement. I haven't got the time to test against other engines yet.

[OliverBr]

Question to the community:
Some engine resign when falling under a certain score. I couldn't find a command in the chess engine protocol to tell the engine to resign. Protocol adapters like polyglot support it, but what if no adapters is used?

Is a command line option useful and will it be used? Anyway, if an engine falls under -600 against another engine, it's very over very quick.,,

[OliverBr]

OliThink 5.4.13 released.
The frist time I changed something with the very simple Hash(TT)Tables. By this way I doubled the memory usage from 48MByte to 96Mbyte

[Dann Corbit]

I'm thinking shared hash is next.
I want to see Olithink mop the floor against the big boys with under 100K of code.
No pressure though.

[OliverBr]

I'm thinking shared hash is next.
I want to see Olithink mop the floor against the big boys with under 100K of code.
No pressure though.

It's quite difficult to increase strength without expanding code. I omitted a couple of ideas just because they were "too expensive" or "too expansive"

[tmokonen]

It looks like the links for the Java version are out of date. The site says 5.4.11, but the links point to 5.4.6.

[OliverBr]

It looks like the links for the Java version are out of date. The site says 5.4.11, but the links point to 5.4.6.

Thank you for the hint. I already corrected this before.

[OliverBr]

OliThink 5.5.0 has been released today.

Most notable change is the refactoring of time management and parts of the search function.

[OliverBr]

OliThink plays a decent midgame, but still the endgame is not good yet. In 100 games against Glaurung 2.1 (17.0 to 83.0) OliThink has not won a single endgame. More than half of the games are open until endgame.
Of the 9 times OliThink won, none of them were endgame wins. Example:

[pgn][Event "Computer Chess Game"]
[Site "OliversMacBook2.local"]
[Date "2020.07.05"]
[Round "31"]
[White "OliThink 5.5.0"]
[Black "Glaurung 2.1"]
[Result "1-0"]
[TimeControl "40/60"]
[Annotator "10. +0.05 9... +0.03"]

1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3 e6 5. Be3 Ne7 6. Nbd2 Bg6 7. Nh4 Nf5 8.
Nxf5 Bxf5 9. Nf3 Be7 {+0.03/13 1.0} 10. Bd3 {+0.05/12 1.1} Bxd3 {+0.01/14}
11. Qxd3 {+0.07/12 1.4} O-O {-0.05/15} 12. h4 {+0.14/12 1.1} c5
{+0.17/13 1.2} 13. dxc5 {+0.49/11 0.8} Nd7 {+0.25/12 0.3} 14. b4
{+0.74/11 0.7} a5 {+0.60/13 1.8} 15. c3 {+0.79/11 0.6} axb4 {+0.60/13 2.0}
16. cxb4 {+0.36/14 0.4} b6 {+0.47/12 1.1} 17. cxb6 {+0.29/12 0.3} Nxb6
{+0.56/12 1.1} 18. Ke2 {+0.52/11 0.8} Nc4 {+0.90/12 1.2} 19. a3
{+0.83/11 1.0} Ra4 {+0.90/12 0.5} 20. Bd4 {+0.59/11 1.1} Qa8 {+0.68/12 1.2}
21. Ng5 {+0.27/12 0.1} g6 {+0.90/13 0.8} 22. f4 {+0.18/12 1.4} Nxa3
{+1.25/11 0.8} 23. h5 {+0.62/12 1.1} Bxg5 {+1.35/12 0.7} 24. fxg5
{+0.72/11 0.7} Nc4 {+1.37/13 0.3} 25. h6 {+0.40/12 1.0} Ra2+ {+1.54/13 0.8}
26. Rxa2 {+0.54/14 0.5} Qxa2+ {+1.66/14} 27. Kf3 {+0.54/13 0.7} Qa4
{+1.37/14 1.4} 28. Rb1 {+0.77/12 0.8} Rb8 {+1.33/14 1.4} 29. Qc3
{+0.00/14 1.4} Qe8 {+1.29/15} 30. Ra1 {+1.15/12 0.7} Rc8 {+1.11/14 0.2} 31.
Qe1 {+1.14/12 0.7} Qf8 {+0.43/14 2.7} 32. Kg4 {+1.20/12 0.7} Rb8
{+0.54/14 0.8} 33. Bc5 {+1.15/13 0.8} Qd8 {+0.50/15} 34. Kh4 {+1.35/12 0.7}
Rc8 {+0.13/14 0.5} 35. Bd4 {+1.35/13 1.3} Nb6 {+0.00/14 0.9} 36. Qf2
{+1.83/12 0.8} Nd7 {-0.17/15 0.7} 37. b5 {+1.88/14 0.9} Ra8 {-0.90/14 2.0}
38. Rb1 {+1.90/14 2.1} Ra4 {-0.35/13 1.0} 39. g4 {+1.88/15 1.0} Qf8
{-0.90/13 0.2} 40. b6 {+2.19/14 0.9} Rb4 {-1.88/13 0.4} 41. Ra1
{+1.98/12 0.1} Rb5 {-4.33/13 1.5} 42. Ra7 {+3.31/12 0.5} Qe8 {-5.37/14 0.6}
{Black resigns} 1-0
[/pgn]

Analysis by Leela (until move 29 both engines played very well):
29...Qe8? - Very defensive, Leela proposes 29...Ra8!
35...Rc8? - Again, Leele prefers 35...Ra8!
38. Rb1? - This time, white blunders (first time after 38 moves), 38. Ra6 !! is more precise.
41. Ra1! - Dagger thrust. White wins.