capture go

aka atari go, 吃子棋, ポン抜き囲碁, 石取りゲーム

• https://senseis.xmp.net/?AtariGo
• no komi, no scoring, no ko, no pass
• simple life and death, single eye at least 2 spaces is alive
• has seki, 3 space eye and opponent has one piece in the middle
• proved PSPACE-complete in “Go Complexities”
• https://forums.online-go.com/t/capture-go-problems/31531/22

Alternative komi

• black has too strong of an advantage
• komi is number of pass to avoid filling in own territory
• what is the correct komi for white?
• pie rule?

Territory is an emergent property

• count territory to tell who wins
• no need to fill in all the empty intersections

Problems

• antonTobi https://forums.online-go.com/t/capture-go-problems/31531
• 3x3 https://www.lifein19x19.com/forum/viewtopic.php?f=15&t=16110
• Bill Spight https://www.lifein19x19.com/viewtopic.php?f=15&t=4003

Solving Ponnuki-Go on small boards

• 4x4 white wins
• 5x5 black wins
• 6x6 with crosscut: black wins
• 6x6 with stable centre: black wins
  • first move made manually
• 6x6 empty board is unknown
  • assuming optimal start is stable centre, then black wins

Capture Go teaching method

• teaching method advocated by Yasuda Yasutoshi
• https://www.usgo-archive.org/sites/default/files/pdf/demaiffe-yasuda.pdf
• Ata und Ri im Reich der Steine

Go as Communication by Yasuda Yasutoshi 安田泰敏

• capture go as an useful game to encourage communication
• don’t need to learn Go, may be too hard/not as fun
• https://fureaiigo-network.jp/ ふれあい囲碁

Hactar Go

• capture any
• capture 3
• capture 5

Dariush3D

https://dagazproject.github.io/go/atari-go.htm

https://gomagic.org/atari-go/

https://www.netigo.org/netigo_v2/StoneSteal/

Torigo has 9x9 capture 5 bot

Fox supports 9x9 capture 3 multiplayer