"Googleplex Starthinker" chess engine

[tsoj]

Hello,

I completely rewrote my old chess engine squared-chess from scratch, using pieces of it, so it got a new name.
- move generation is now staged
- transposition table uses two separate tables: always replace and a selective replace
- PVS search is now implemented
- aspiration window
- a million bugs got removed
- code looks nicer
- option: adjustable linear skill levels 0-99
- option: randomized search
- nicer logo
- nicer name
- can now also easily be compiled with Mircosoft Visual Studio (and with a makefile on Linux)

Elo improvement compared to squared-chess 1.3.0 is probably between 80 and 160 (~2150 CCRL 40/4).

Googleplex Starthinker 1.3

[Guenther]

Hello,

I completely rewrote my old chess engine squared-chess from scratch, using pieces of it, so it got a new name.
- move generation is now staged
- transposition table uses two separate tables: always replace and a selective replace
- PVS search is now implemented
- aspiration window
- a million bugs got removed
- code looks nicer
- option: adjustable linear skill levels 0-99
- option: randomized search
- nicer logo
- nicer name
- can now also easily be compiled with Mircosoft Visual Studio (and with a makefile on Linux)

Elo improvement compared to squared-chess 1.3.0 is probably between 80 and 160 (~2150 CCRL 40/4).

Googleplex Starthinker 1.3

Nice improvement Jost, still I dislike the name of the new program or let's say the 'commercial part' of it.
Think about an 'Amazon Stockfish' or 'Red Bull Baron' or 'McDonalds Komodo' brrrrrr....

Starthinker is good though.

[tsoj]

Think about an 'Amazon Stockfish' or 'Red Bull Baron' or 'McDonalds Komodo' brrrrrr....

Starthinker is good though.

I thought "Great Hyperlobic Omni-Cognate Neutron Wrangler' is a bit long, and "Deep Thought" and "Hactar" already exist.

[Guenther]

Think about an 'Amazon Stockfish' or 'Red Bull Baron' or 'McDonalds Komodo' brrrrrr....

Starthinker is good though.

I thought "Great Hyperlobic Omni-Cognate Neutron Wrangler' is a bit long, and "Deep Thought" and "Hactar" already exist.

Hi Jost,

I am sorry, I completely missed that 'Googleplex Starthinker' was meant as a reference to the supercomputer in a 'hitchhiker's guide to the galaxy'
and not to the googleplex building

[tsoj]

I am sorry, I completely missed that 'Googleplex Starthinker' was meant as a reference to the supercomputer in a 'hitchhiker's guide to the galaxy'
and not to the googleplex building

There is a new release (1.4), mainly fixed segfaults that happen because I thought that 64 quiet moves are enough . And transposition table won't get cleared between moves.
https://gitlab.com/tsoj/Googleplex_Starthinker/tags

[pgn]

[Site "https://lichess.org/bm3cO1vP"]
[Date "2018.12.02"]
[Round "14"]
[White "Googleplex Starthinker"]
[Black "Sungorus 1.4"]
[Result "1-0"]
[WhiteElo "?"]
[BlackElo "2311 CCRL"]
[ECO "E68"]
[GameDuration "00:05:33"]
[GameEndTime "2018-12-02T22:08:09.518 CET"]
[GameStartTime "2018-12-02T22:02:35.623 CET"]
[Opening "King's Indian, Fianchetto, Classical Variation, 8. e4"]
[PlyCount "113"]
[TimeControl "40/120"]

1. d4 {book} Nf6 {book} 2. c4 {book} g6 {book} 3. Nc3 {book} Bg7 {book}
4. g3 {book} O-O {book} 5. Bg2 {book} d6 {book} 6. Nf3 {book} Nbd7 {book}
7. O-O {book} e5 {book} 8. e4 {book}{ E68 King's Indian, Fianchetto, Classical Variation, 8. e4 } exd4 {-0.07/12 3.6s}
9. Nxd4 {-0.04/13 3.5s} Kh8 {-0.18/11 3.6s} 10. Qe2 {+0.45/12 2.8s}
Ne8 {+0.07/11 3.6s} 11. Be3 {+0.82/14 5.1s} c5 {+0.33/13 3.6s}
12. Nc2 {+0.60/15 12s} Bxc3 {+0.44/12 3.6s} 13. bxc3 {+0.65/13 2.6s}
Qa5 {+0.69/12 3.6s} 14. Bh6 {+0.52/15 3.9s} Rg8 {+0.71/13 3.6s}
15. Ne3 {+0.77/15 5.1s} Qxc3 {+0.79/12 3.6s} 16. Nd5 {+0.91/15 5.2s}
Qe5 {+0.83/12 3.6s} 17. f4 {+0.83/15 7.8s} Qe6 {+0.86/11 3.6s}
18. Qb2+ {+0.82/13 4.5s} f6 {+0.93/11 3.6s} 19. Qc3 {+0.86/12 2.4s}
Nb6 {+0.95/12 3.6s} 20. a4 {+0.78/13 8.3s} Qf7 {+1.01/12 3.6s}
21. e5 {+0.84/12 2.1s} Nxd5 {+0.83/13 3.6s} 22. cxd5 {+0.96/15 3.7s}
b6 {+0.79/12 3.6s} 23. e6 {+1.13/14 4.7s} Qe7 {+0.64/13 3.6s}
24. g4 {+1.08/14 3.0s} Ba6 {+0.64/11 3.6s} 25. Rfe1 {+1.11/15 4.9s}
Bb7 {+0.65/12 3.6s} 26. g5 {+1.56/16 3.7s} Ba6 {+0.58/11 3.6s}
27. Rab1 {+1.58/13 3.8s} Rc8 {+0.57/12 3.6s} 28. Be4 {+1.56/14 4.0s}
Rb8 {+0.57/12 3.6s} 29. Kh1 {+1.57/11 1.6s} Rb7 {+0.17/12 3.6s}
30. f5 {+1.70/13 3.3s} gxf5 {+0.19/13 3.6s} 31. Bxf5 {+1.71/13 2.2s}
b5 {+0.14/12 3.6s} 32. axb5 {+1.78/12 2.2s} Rxb5 {-0.05/12 3.6s}
33. Bxh7 {+2.58/12 3.7s} Qxh7 {-1.55/12 3.6s} 34. gxf6 {+3.34/13 2.6s}
Qxh6 {-1.71/13 3.6s} 35. f7+ {+3.97/13 5.8s} Ng7 {-1.99/13 3.6s}
36. e7 {+4.33/10 0.61s} Rxb1 {-3.27/13 3.6s} 37. Rxb1 {+5.14/12 1.1s}
Qh5 {-3.55/13 3.6s} 38. f8=Q {+5.29/12 1.4s} Qxd5+ {-4.74/12 3.7s}
39. Qff3 {+5.45/11 1.2s} Qxf3+ {-5.44/12 3.7s} 40. Qxf3 {+5.78/10 0.53s}
Bc8 {-8.40/13 3.3s} 41. Rg1 {+8.62/16 17s} Bd7 {-8.88/14 3.0s}
42. Rg3 {+8.57/13 2.2s} Be8 {-10.58/16 3.0s} 43. Rh3+ {+10.62/15 4.3s}
Nh5 {-9.86/16 3.0s} 44. Rxh5+ {+10.57/14 3.8s} Bxh5 {-10.93/16 3.0s}
45. Qxh5+ {+10.83/14 3.3s} Kg7 {-16.18/15 3.0s} 46. Qg5+ {+10.80/13 2.9s}
Kf7 {-16.54/15 3.0s} 47. Qxg8+ {+10.57/11 2.2s} Kxe7 {-17.16/14 3.0s}
48. h4 {+15.45/12 3.8s} Kd7 {-17.96/13 3.0s} 49. h5 {+M17/13 4.5s}
c4 {-19.58/12 3.0s} 50. Qxc4 {+M15/12 1.9s} d5 {-M14/13 3.0s}
51. Qxd5+ {+M13/10 0.59s} Ke7 {-M12/14 3.0s} 52. Qg5+ {+M11/9 0.24s}
Ke6 {-M10/14 3.0s} 53. h6 {+M9/8 0.17s} a6 {-M8/12 3.0s} 54. h7 {+M7/6 0.097s}
Kf7 {-M6/11 3.0s} 55. h8=Q {+M5/4 0.068s} Ke6 {-M4/10 3.0s}
56. Qge5+ {+M3/2 0.040s} Kf7 {-M2/11 3.0s} 57. Qef6# {+M1/1 0.030s, White mates}
1-0

[/pgn]