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.

Pachi Networks

Extra dcnns supported by Pachi:

• Detlef's 54% dcnn
  Default network, about 1d level.
  Fully convolutional, so can work with boards other than 19x19.

• Detlef's 44% dcnn
  Its predecessor.

• Darkforest dcnn
  Trained to predict next 3 moves, about 3d level.
  Converted to caffe with torch2caffe.

Pachi 12.30

Binary release for Linux / Windows.

Changes since 12.20:

• Lizzie support !
• Dcnn pondering
• Japanese rules: territory scoring in playouts
• Full gtp undo

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