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There are many go servers but all of them seem to be for player-player games. I want to play online against a computer. I found some but it is not an actual go. I was not able to find a real go brain online. Are there any at all?

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Some Go servers allow computers to "log in" and play just like regular users. On KGS, for example, they are marked with a computer icon, and there is a setting in the "automatch" for finding games with bots. More details are available here:

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Aha, nice, I didn't expect to find this on these player-player sites! I was looking for something easier though, here you have to register, find a bot etc... but it will become the last resort if I don't find any other online service. – Tomas Aug 11 '14 at 9:46
@Tomas KGS has guest access. – CodesInChaos Sep 4 '14 at 14:44 has two bots to play and you don't need an account. The levels of the bots are 26 kyu and 13 kyu. Also the bots are always available to play

To challenge a bot:

  1. Go to click game lobby and chat on the sidebar.

  2. Click new game which is located by the bottom left of the chat box

  3. A popup will appear on your screen, click in the top left on the icon of the globe.

  4. A dropdown menu will appear click on the option that says computer

  5. You can then specify the game settings.

  6. Click on Challenge and enjoy!

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Check out Cosumi, it plays around 8kyu in my opinion. After the page loads just click on the HTML5 button, don't get scared by the Japanese symbols..

If you browse their page a bit you can even find different modes regarding sizes or rules (for example one color go).

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Computer ability at Go is very basic and like Chess very demanding on computer resources. You will find program's and databases you can download to run on your own computer.

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"like chess"? You'd better say "unlike chess" - go is much more demanding and that's probably the reason why it's not easy to find an online service (as you correctly noted) – Tomas Aug 10 '14 at 19:05
I agree Go is more computational intensive. What I mean is centralising the supply of resources for these types of application is not practical. – user8250 Aug 10 '14 at 19:13

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