Keywords: Software

Crazy Stone is a strong program by Rémi Coulom which uses Monte Carlo Tree Search and pattern learning. Crazy Stone came second in the 2007 Computer Olympiad behind MoGo. MoGo claims they were partly inspired by Crazy Stone (they are both French).

In July 2007, a [ext] match was played on KGS between Crazy Stone and KCC Igo, which Crazy Stone won 15-4. KCC Igo was considered the strongest commercial Go program at the time.

In spring of 2011, Crazy Stone, playing as '[ext] bonobot', briefly reached 5 dan on KGS, and maintained a 4 dan rating.

On December 2nd, 2007, Crazy Stone won both of the KGS tournaments and the UEC Cup in Japan, ahead of MoGo in all three events. In 2008, Crazy Stone defended its UEC Cup title, defeating Many Faces of Go. Afterwards, it defeated Kaori Aoba, Japanese 4p, in a 7-stone handicap exhibition game. That gave Crazy Stone a claim to being the strongest program in the world at that time.

In March 2014, Crazy Stone established a 6-dan rating on KGS.

Crazy Stone was mentioned in the French public radio show Science Publique: [ext] L'ordinateur deviendra-t-il un maître de Go ? (Will the computer become a Go master?) at France Culture on 2008-01-11 ([ext] the old webpage of that podcast, archived in 2008).

[ext] An interview with Remi Coulom | Russian Go Federation (June 2011)

On March 20, 2013, Crazy Stone won a 19x19 four-stone handicap game against Honorary Honinbo Ishida Yoshio with a final score of B+2.5. ([ext] Report and Game Record).

In 2016, a new version that uses deep learning was able to significantly increase Crazy Stone's strength.

Products powered by Crazy Stone

[ext] Crazy Stone Deep Learning -The First Edition- on Steam
[ext] Crazy Stone DEEP LEARNING at the UNBALANCE website

Android and iOS:
[ext] CrazyStone DeepLearning Pro
[ext] CrazyStone DeepLearning
[ext] Champion Go ([ext] correct Android link)

Engine Server

The smartphone/iPad versions offer in-app purchases of tickets to play against the CrazyStone Engine Server which is significantly stronger than native app version.

The engine server version offers 10 levels of play. Currently, there are no details publicly available regarding the strength of the server version or the hardware on which it runs. However, according to some user feedback, it seems to be significantly weaker than KGS 6d as of 24 April 2016.

The in-app description explains:

"Crazy Stone is a popularly known Go engine, based on the Monte-Carlo evaluation technique, combined with tree search, and has achieved 6d at KGS rating. We have optimized this version for Engine Server games."

Some users claim that the engine server version has been "optimized" to play faster but weaker, and estimate it to play at around 1-3d KGS level.

CrazyStone last edited by on July 18, 2023 - 19:45
RecentChanges · StartingPoints · About
Edit page ·Search · Related · Page info · Latest diff
[Welcome to Sensei's Library!]
Search position
Page history
Latest page diff
Partner sites:
Go Teaching Ladder
Login / Prefs
Sensei's Library