Life In 19x19

Pachi 12.86 pre-release is out:

• katago cpu build
• added --modern-joseki option
• many fixes (rave, playout, mm, seki ...)
• updated joseki fixes database

Have fun =)
Let me know if you see anything broken.

Hi,

If you enjoy playing with pachipachi bot on kgs there's a little fundraising going on at the moment to buy new hardware.
(The hardware it was running on for the last 5 years just died !)

Many people find it useful and it'd be great to run it as a community supported project (until now i've ...

Pachi 12.84:

• Added --banner option (replaces "banner" uct param)
• Fixed options that got broken in 12.80 (--kgs, --kgs-chat, --noundo, --name work again)
• Fixed memory corruptions found by address sanitizer
• Minor josekifix and mm fixes
• Updated joseki fixes database (2023-08-21)

Pachi 12.82:

• Retuned dcnn and pattern priors
• Use progressive dcnn prior
• Normalize pattern probabilities
• Set number of threads for dcnn evaluation

Retuned prior parameters, slightly stronger than 12.80 and should deal with dcnn blind spots better.
Have fun =)

Pachi 12.80 is out:

• Filter more dcnn blunders
• Better MM atari patterns
• Updated joseki fixes database (2023-05-12) + code
• UCT search speedup

Haven't tested extensively yet, if you see something unusual please let me know (create an issue on github).
Enjoy =)

Thanks And =)

Pachi 12.60 is out:

• fixed remaining seki issues
• fixed tree gc issues
• removed --accurate-scoring, unnecessary now
• --smart-pass: more user-friendly pass behavior

See homepage for more info.

Pachi 12.50 is out:

• fixed analyze issues in Sabaki
• automatically grow tree memory as needed
• fixed kgsgtp-3.5.20+ crashes (kgs-chat disabled by default now)

See homepage for more info.

Pachi 12.40 is out:


⋅  speedup, about 20% faster
⋅  multiple dcnns support: detlef44, detlef54, darkforest
⋅  lz-genmove_analyze support (get winrates in sabaki etc)
⋅  lz-analyze: handle frequency
⋅  set engine options over gtp
⋅&nbsp ...

Pachi 12.30 is out:

• lizzie support !
• dcnn pondering
• japanese rules: territory scoring in playouts
• full gtp undo

See homepage for more info.

update: Nov 06, Pachi 12.20 is out.

• dcnn: handle smaller board sizes
• don't play slack when taking handicap
• mm patterns fixes, better prediction rate
• use joseki engine when playing without dcnn

See homepage for more info.

Hi again !

How come they don't share the same winning percentage?

I was under the impression that Pachi was performing a sort of mini max algorithm, so the win rate of the complete "path" would be deduced from the deepest leaf (following a "mini max" propagation from deepest leaf to first leaf ...

I had a try and it seems to work just fine now. By the way, I am curious how Pachi can decide when the fuseki is over. Nothing fancy right now, fuseki is fixed at first 20 moves for 19x19, less for smaller boards.

[280000] best 49.0% xkomi 7.5 | seq Q16 L17 D4 C11 | can b Q16(49 ...

In fact, I am considering adding support to Pachi in GoReviewPartner Cool, looking forward to it. Let me know if you need anything.

In fact, the readme says something like:
> Mostly useful when running without dcnn (dcnn can deal with fuseki). And this is sort of true: when playing against ...

Hi pnprog,

I tried this on Ubuntu and it did not work. Apparently, pachi requires an old version of libboost-system (libboost-system1.54.0) and on the newest version of ubuntu, it is not available any more. Here I am using Ubuntu 17.10, and libboost-system1.62.0 and libboost-system1.63.0 are ...