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Senpai 2.0
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Fabien Letouzey



Joined: 22 Jan 2011
Posts: 125
Location: Lille, France

PostPost subject: Senpai 2.0    Posted: Fri Nov 10, 2017 6:07 am Reply to topic Reply with quote

Hi all,

After a few years in computer draughts, I am back to chess for a little while. I see too many draws at top level, and am afraid that it will be too late in a couple of years. Big hardware and large opening books are also not helping IMO.

So I'm here to announce Senpai 2.0. The code looks all different because I started from my draughts program, but it's actually still Senpai inside. I prefer having a consistent codebase for multiple games (also Shogi and Othello).

As a rewrite it's hard to list changes, but here is an attempt:
- Chess960 is baked in, not an add-on; Senpai 2 plays chess only as a special case!
- search: restricted singular extensions
- search: additional reduction/pruning of "losing" moves (SEE < 0)
- eval: tempo bonus (it seems I forgot in 1.0 ...)
- eval: "space" (glorified pawn-chain PST); this changes playing style a lot
- eval: scoring by logistic regression; this gives me more freedom for eval features
- board: copy/make (customary in games with fewer piece types than chess)
- board: optional PEXT bitboards (BMI2)

As I recall, no single change brought more than 10 Elo. So it's more a sum of small (IMO) things.

This release has been rushed a little, so it's still lacking UCI options and multi-PV; sorry about that.

Official website: http://www.amateurschach.de/main/_senpai.htm
Direct link: http://www.amateurschach.de/download/senpai_20.zip
Expected level: Texel/Protector (again)

Thanks to everybody who helped with this release:
- Graham Banks
- Michael Byrne
- Wilhelm Hudetz
- Daniel Jose
- Steve Maughan (https://www.chessprogramming.net)
- Frank Quisinsky (http://www.amateurschach.de)
- XXX (<- this line for people I forgot, sorry in advance).

That's all for now,

Fabien.
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Subject Author Date/Time
Senpai 2.0 Fabien Letouzey Fri Nov 10, 2017 6:07 am
      Re: Senpai 2.0 Dann Corbit Fri Nov 10, 2017 6:20 am
      Re: Senpai 2.0 Brendan J. Norman Fri Nov 10, 2017 6:30 am
            Re: Senpai 2.0 Frank Quisinsky Fri Nov 10, 2017 6:36 am
                  Re: Senpai 2.0 Michael B Fri Nov 10, 2017 6:42 am
                  Re: Senpai 2.0 Brendan J. Norman Sat Nov 11, 2017 3:58 pm
                        Re: Senpai 2.0 ... BTW: Wasp (other things). Frank Quisinsky Sat Nov 11, 2017 5:23 pm
      Re: Senpai 2.0 Evert Glebbeek Fri Nov 10, 2017 6:43 am
            Re: Senpai 2.0 Fabien Letouzey Fri Nov 10, 2017 6:53 am
                  Re: Senpai 2.0 Evert Glebbeek Fri Nov 10, 2017 9:17 am
      Re: Senpai 2.0 Guenther Simon Fri Nov 10, 2017 7:29 am
            Re: Senpai 2.0 Guenther Simon Fri Nov 10, 2017 1:08 pm
                  Re: Senpai 2.0 Fabien Letouzey Fri Nov 10, 2017 1:44 pm
                        Re: Senpai 2.0 Marek Soszynski Fri Nov 10, 2017 3:35 pm
      Re: Senpai 2.0 Gabor Szots Fri Nov 10, 2017 7:41 am
      Re: Senpai 2.0 Gabor Szots Fri Nov 10, 2017 7:51 am
      Re: Senpai 2.0 Michel Van den Bergh Fri Nov 10, 2017 9:34 am
      Re: Senpai 2.0 Bigler Fri Nov 10, 2017 9:39 am
      Re: Senpai 2.0 Volker Pittlik Fri Nov 10, 2017 12:43 pm
      Re: Senpai 2.0 Lucas Braesch Fri Nov 10, 2017 1:02 pm
            Re: Senpai 2.0 Fabien Letouzey Sat Nov 11, 2017 3:58 am
                  Re: Senpai 2.0 Lucas Braesch Sat Nov 11, 2017 6:37 am
                        Re: Senpai 2.0 Lucas Braesch Sat Nov 11, 2017 12:53 pm
                              Re: Senpai 2.0 Rein Halbersma Mon Nov 13, 2017 10:40 pm
                        Re: Senpai 2.0 Rasmus Althoff Tue Nov 14, 2017 12:05 am
      Re: Senpai 2.0 Tamás Kuzmics Fri Nov 10, 2017 2:05 pm
      Re: Senpai 2.0 Brendan J. Norman Fri Nov 10, 2017 2:47 pm
      Re: Senpai 2.0 Carl Langan Fri Nov 10, 2017 10:13 pm
      Re: Senpai 2.0 fernando Sat Nov 11, 2017 5:51 pm
            Re: Senpai 2.0 Tony Mokonen Tue Nov 14, 2017 4:06 am
                  Re: Senpai 2.0 Guenther Simon Tue Nov 14, 2017 6:39 am
                        Re: Senpai 2.0 Tony Mokonen Tue Nov 14, 2017 10:41 pm
                              Re: Senpai 2.0 Guenther Simon Wed Nov 15, 2017 1:28 pm
                              Re: Senpai 2.0 alexei chernakoff Fri Nov 17, 2017 8:04 am
                                    Re: Senpai 2.0 Fabien Letouzey Fri Nov 17, 2017 11:59 am
                                          Re: Senpai 2.0 alexei chernakoff Fri Nov 17, 2017 12:16 pm
                              Re: Senpai 2.0 Ernest Bonnem Fri Nov 17, 2017 6:24 pm
                                    Re: Senpai 2.0 Guenther Simon Fri Nov 17, 2017 6:55 pm
                                          Re: Senpai 2.0 Tony Mokonen Fri Nov 17, 2017 7:03 pm
                                                Re: Senpai 2.0 Steve Maughan Fri Nov 17, 2017 7:13 pm
                                                Re: Senpai 2.0 Ernest Bonnem Fri Nov 17, 2017 7:24 pm
                                                      Re: Senpai 2.0 Guenther Simon Fri Nov 17, 2017 7:30 pm
                  Re: Senpai 2.0 fernando Wed Nov 15, 2017 3:19 am
                  Re: Senpai 2.0 -32-bit compile - Tahank you !! Ruxy Sylwyka Wed Nov 15, 2017 8:52 pm
      Re: Senpai 2.0 Peter Berger Mon Nov 13, 2017 10:23 pm
            Re: Senpai 2.0 Eelco de Groot Mon Nov 13, 2017 11:57 pm
      Re: Senpai 2.0 Tony Soares Mon Nov 13, 2017 11:44 pm
      Re: Senpai 2.0 Ryan Benitez Sat Nov 25, 2017 5:14 am
            Re: Senpai 2.0 Fabien Letouzey Sat Nov 25, 2017 5:49 am
                  Re: Senpai 2.0 T. Poppins Sat Nov 25, 2017 8:21 am
                        Re: Senpai 2.0 Guenther Simon Sat Nov 25, 2017 9:07 am
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