Pachi 12.86

• KataGo CPU build
• Added --modern-joseki option
• Validate GTP input
• Many fixes (Rave, Playout, MM, Seki ...)
• Updated joseki fixes database (2025-02-11)

This release comes with a KataGo CPU build, so everything should work out of the box.
If your CPU is not too old get the AVX version, it runs faster and uses a stronger Katago network.
Otherwise get the non AVX version which should run anywhere.

Change number of playouts in katago.cfg to adjust playing speed when playing with --modern-joseki option.
For Pachi-only play without KataGo joseki fixes use pachi --nojosekifix.

You can also play with KataGo directly, it's really strong even with few playouts :

katago_cpu gtp -config katago.cfg -model g170e-b10c128-s1141046784-d204142634.bin.gz
katago_cpu gtp -config katago.cfg -model g170e-b15c192-s1672170752-d466197061.bin.gz

For GPU releases see https://github.com/lightvector/KataGo/releases

KataGo Models

Some Katago models from katagoarchive.org used by josekifix module.

The g170 models are from the extended training run:
They are small models which have been trained beyond their normal scope. They do very well for their size (much better than other models of similar size). The 10 block model can even run on Raspberry Pis, although with few playouts.

10 block model: g170e-b10c128-s1141046784-d204142634.bin.gz
15 block model: g170e-b15c192-s1672170752-d466197061.bin.gz

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

Retuning release (55% winrate against Pachi 12.80).

Pachi 12.80

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

Joseki fixes are meant for online play primarily and need an external engine setup (KataGo), but will work for local play too if you take the time to set it up (See MORE for details).

Pachi 12.70

• Joseki fixes from Pachi games (2018-2022)
• Allow to override joseki sequences by editing an SGF file
• Better bent-four handling
• Fixed some dcnn blunders (first-line connects)

Joseki fixes are meant for online play primarily and need an external engine setup (KataGo), but will work for local play too if you take the time to set it up. See josekifix/README and josekifix/katago on how to update the database and setup KataGo.

Pachi 12.60

Binary release for Linux / Windows.

Changes since 12.50:

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

Pachi 12.50

Binary release for Linux / Windows.

Changes since 12.45:

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

Pachi 12.45

Binary release for Linux / Windows.

Changes since 12.40:

• --accurate-scoring: use GnuGo to compute dead stones at the end
• --fuseki-time stops after move 10 instead of 20
• Endgame pass fixes
• Fixed gtp undo timer issue

Use pachi_19x19.exe if you only play on 19x19, should be slightly faster.

Pachi 12.40

Binary release for Linux / Windows.

Changes since 12.30:

• 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
• Dcnn pondering fix

Use pachi_19x19.exe if you only play on 19x19, should be slightly faster.

Edit: Apr 06 - Fixed darkforest, detlef44 dcnn issues, should work now.