Answers.Body: <ul>
  <li>Crafty</li>
  <li>Arasan</li>
  </ul>
  
  <p>I don't recommend Pulse or NG-Play in the other answer as they're no longer maintained. The three engines I cited are still very active.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T08:17:17.390Z
Answers.Text: Micromax is too weak, isn't it? AFAIK, the aim of the Micromax is to be tiny. I think OP wants a strong engine to build upon.
Answers.UserDisplayName: ferit
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T08:18:06.203Z
Answers.Text: @Sailbot When did the OP stated he wanted a "strong" engine? He was just asking for an open source engine.
Answers.UserDisplayName: SmallChess
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T08:20:21.977Z
Answers.Text: "I think", when someone wants an engine to modify and redistribute as a commercial product, wants a strong engine to build upon. Do you disagree?
Answers.UserDisplayName: ferit
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T08:21:35.800Z
Answers.Text: @Saibot We don't know what he's doing and we shouldn't assume. It's fine to distribute a "weaker" engine. In fact, I've been selling MicroMax on the iOS quite easily. Search for "Chess Mini iOS" and you'll see.
Answers.UserDisplayName: SmallChess
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T08:23:42.297Z
Answers.Text: Are you selling an engine, or selling a chess playing app running some engine which users don't care? I think these are different things. When you sell an engine, you need your engine to be very strong.
Answers.UserDisplayName: ferit
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T08:25:07.420Z
Answers.Text: @Saibot Both. Almost nobody on this planet can sell just an engine. Only Komodo is doing it. Before that, Houdini and Rybka. Everybody else bundles an engine with something else.
Answers.UserDisplayName: SmallChess
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T08:29:24.537Z
Answers.Text: Yes, that's what I'm saying too. If you want to sell an engine, that engine should be a top level engine like Houdini, Rybka, etc. OP seems to interested in developing an engine, not in a wrapper app, what do you think?
Answers.UserDisplayName: ferit
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T08:33:54.747Z
Answers.Text: Woah. easy. 
  Thank you Saibot and Student T for your inputs. I just updated the description to add more context.
Answers.UserDisplayName: Arun J
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T08:34:38.643Z
Answers.Text: Just in time :-)
Answers.UserDisplayName: ferit
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T08:13:41.330Z
Answers.LastActivityDate: 2015-12-29T09:06:02.810Z
Answers.LastEditDate: 2015-12-29T09:06:02.810Z
Answers.UserDisplayName: SmallChess
Answers.Body: <p><a href="https://en.wikipedia.org/wiki/Fairy-Max" rel="nofollow noreferrer">Fairy-Max</a> and micro-Max are not particularly strong, but they are in public domain and have been used in different devices.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-08-09T21:32:19.720Z
Answers.LastActivityDate: 2020-08-09T21:32:19.720Z
Answers.UserDisplayName: Andriy Makukha
Answers.Body: <p>Some searching yielded:</p>
  
  <ul>
  <li><a href="http://www.arasanchess.org/" rel="nofollow">Arasan</a></li>
  <li><a href="https://chessprogramming.wikispaces.com/Pulse" rel="nofollow">Pulse</a></li>
  <li><a href="http://users.otenet.gr/~yggeorgo/" rel="nofollow">NG-Play</a></li>
  </ul>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-08-28T09:50:39.503Z
Answers.Text: NG-Play doesn't fit the MIT licence. The author has not put in a clear licence, but he writes (in the sources) that the whole thing has to stay open source. More in line with the GPL. From the source text: `/* Author: George Georgopoulos (c) 2010-2014 */ /* You are free to copy/derive from this code */ /* as long as you mention this copyright */ /* and keep the new code open source */`
Answers.UserDisplayName: Ras
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-29T05:10:50.910Z
Answers.LastActivityDate: 2015-12-29T05:38:24.483Z
Answers.LastEditDate: 2015-12-29T05:38:24.483Z
Answers.UserDisplayName: ferit
Body: <p>What are some of the open source Chess engines under the MIT license?</p>
  
  <blockquote>
    <p>The purpose of the search is to find a suitable strong engine to be used in our chess hardware/software product. Thanks. </p>
  </blockquote>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-12-29T04:57:43.370Z
Comments.Text: Why do you need MIT Licensed engines? Just curious.
Comments.UserDisplayName: ferit
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-12-29T05:06:28.433Z
Comments.Text: Some parts of the GNU license are vague. Like, it states that if I create something out of the code, I'll have to open source that as well, and doesn't mention the specifics. As far as I know, MIT license is better if someone plans to make a commercial product out of an open source project.
Comments.UserDisplayName: Arun J
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-12-29T05:10:04.887Z
Comments.Text: In GPLv3, you can use it for commercial uses, in GPLv2, you are right, it has restrictions. Check if they are in GPLv3. Also, they often say GPLv2 or later, in that case, you can assume it's GPLv3.
Comments.UserDisplayName: ferit
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-12-29T05:33:42.053Z
Comments.Text: You can use commercially, but you have to open the source it seems. Strong copyleft licenses don't let to close the source, but weak copyleft's like LGPL let. I recommend to read this: https://en.wikipedia.org/wiki/Copyleft
Comments.UserDisplayName: ferit
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-12-29T08:09:18.120Z
Comments.Text: @Saibot Although you're technically correct, chess is different because most engines started by process (inter-process communication). Thus it's not essential to open up the source code even it's bundled with a GPL software. If you want to know more, start a new question.
Comments.UserDisplayName: SmallChess
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-12-29T08:21:35.127Z
Comments.Text: Asked the question.
Comments.UserDisplayName: ferit
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-12-29T08:31:53.643Z
Comments.Text: @Arun J Thanks for clarification  edit :-) Then as Student T said, using GPLs won't be a problem I think.
Comments.UserDisplayName: ferit
Tags: <engines>
Title: Open source Chess engines under MIT license?
ThreadText: # Open source Chess engines under MIT license?
  
  (Asked by: username_0 on 2015-12-29)
  
  What are some of the open source Chess engines under the MIT license?
  
  > The purpose of the search is to find a suitable strong engine to be used in our chess hardware/software product. Thanks.
  
  **Tags:** engines
  
  > **Comments:**
  > **username_1**: Why do you need MIT Licensed engines? Just curious.  
  > **username_0**: Some parts of the GNU license are vague. Like, it states that if I create something out of the code, I'll have to open source that as well, and doesn't mention the specifics. As far as I know, MIT license is better if someone plans to make a commercial product out of an open source project.  
  > **username_1**: In GPLv3, you can use it for commercial uses, in GPLv2, you are right, it has restrictions. Check if they are in GPLv3. Also, they often say GPLv2 or later, in that case, you can assume it's GPLv3.  
  > **username_1**: You can use commercially, but you have to open the source it seems. Strong copyleft licenses don't let to close the source, but weak copyleft's like LGPL let. I recommend to read this: https://en.wikipedia.org/wiki/Copyleft  
  > **username_2**: @Saibot Although you're technically correct, chess is different because most engines started by process (inter-process communication). Thus it's not essential to open up the source code even it's bundled with a GPL software. If you want to know more, start a new question.  
  > **username_1**: Asked the question.  
  > **username_1**: @username_0 Thanks for clarification  edit :-) Then as Student T said, using GPLs won't be a problem I think.  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_2 on 2015-12-29. Score: 3
  
  * Crafty
  * Arasan
  
  I don't recommend Pulse or NG-Play in the other answer as they're no longer maintained. The three engines I cited are still very active.
  
  > **Comments:**
  > **username_1**: Micromax is too weak, isn't it? AFAIK, the aim of the Micromax is to be tiny. I think OP wants a strong engine to build upon.  
  > **username_2**: @Sailbot When did the OP stated he wanted a "strong" engine? He was just asking for an open source engine.  
  > **username_1**: "I think", when someone wants an engine to modify and redistribute as a commercial product, wants a strong engine to build upon. Do you disagree?  
  > **username_2**: @Saibot We don't know what he's doing and we shouldn't assume. It's fine to distribute a "weaker" engine. In fact, I've been selling MicroMax on the iOS quite easily. Search for "Chess Mini iOS" and you'll see.  
  > **username_1**: Are you selling an engine, or selling a chess playing app running some engine which users don't care? I think these are different things. When you sell an engine, you need your engine to be very strong.  
  > **username_2**: @Saibot Both. Almost nobody on this planet can sell just an engine. Only Komodo is doing it. Before that, Houdini and Rybka. Everybody else bundles an engine with something else.  
  > **username_1**: Yes, that's what I'm saying too. If you want to sell an engine, that engine should be a top level engine like Houdini, Rybka, etc. OP seems to interested in developing an engine, not in a wrapper app, what do you think?  
  > **username_0**: Woah. easy.  Thank you Saibot and Student T for your inputs. I just updated the description to add more context.  
  > **username_1**: Just in time :-)  
  
  ---
  
  ### Answer by username_3 on 2020-08-09. Score: 1
  
  [Fairy-Max](https://en.wikipedia.org/wiki/Fairy-Max) and micro-Max are not particularly strong, but they are in public domain and have been used in different devices.
  
  
  ---
  
  ### Answer by username_1 on 2015-12-29. Score: 1
  
  Some searching yielded:
  
  * [Arasan](http://www.arasanchess.org/)
  * [Pulse](https://chessprogramming.wikispaces.com/Pulse)
  * [NG-Play](http://users.otenet.gr/~yggeorgo/)
  
  > **Comments:**
  > **username_4**: NG-Play doesn't fit the MIT licence. The author has not put in a clear licence, but he writes (in the sources) that the whole thing has to stay open source. More in line with the GPL. From the source text: `/* Author: George Georgopoulos (c) 2010-2014 */ /* You are free to copy/derive from this code */ /* as long as you mention this copyright */ /* and keep the new code open source */`  
  
  ---
  
  