user3405: I am looking for an UCI compatible engine with an ELO of less than 1800. Not a version of Houdini or Stockfish with an ELO of 1800. I want a engine with a real ELO rating of 1800 or less. If you can help me with links, that would be great.

user3638: Actually, on the CCRL 40/4 there're around 170 engines under 1800, not just a dozen. You can also check this list based on bullet games: http://e4e6.com/ratings.php?id=1001
Most of the engines work properly, especially at long time controls.
Almost all of them are still available on the Internet, just Google them.
Alex

user1036: There is an engine called Delfi made by msb software. It is designed to play at lower ratings but also to play more like a human amateur. It is commercial, not free but I think there is a free version with some limitations. 

user72: Take a look at numpty. It claims to have a ELO of about 1500-1800. I've played it on FICS before and it usually has a blitz rating of 1900-2100. Note that FICS ratings are usually horribly skewed by all the cheating that happens on there.

user8309: Adam Hair has a rating list for weaker engines:
http://adamsccpages.blogspot.com/p/also-rans-rating-list.html
Grizzly and Chenard are UCI, but a lot of the weaker engines tend to be CECP.

3405: <p>I am looking for an UCI compatible engine with an ELO of less than 1800. Not a version of Houdini or Stockfish with an ELO of 1800. I want a engine with a real ELO rating of 1800 or less. If you can help me with links, that would be great.</p>
 3638: <p>Actually, on the CCRL 40/4 there're around 170 engines under 1800, not just a dozen. You can also check this list based on bullet games: <a href="http://e4e6.com/ratings.php?id=1001" rel="nofollow">http://e4e6.com/ratings.php?id=1001</a>
Most of the engines work properly, especially at long time controls.
Almost all of them are still available on the Internet, just Google them.</p>

<p>Alex</p>
 1036: <p>There is an engine called Delfi made by <a href="http://www.msbsoftware.it/delfi/" rel="nofollow" title="msb software">msb software</a>. It is designed to play at lower ratings but also to play more like a human amateur. It is commercial, not free but I think there is a free version with some limitations. </p>
 72: <p>Take a look at <a href="https://sites.google.com/site/numptychess/" rel="nofollow">numpty</a>. It claims to have a ELO of about 1500-1800. I've played it on FICS before and it usually has a blitz rating of 1900-2100. Note that FICS ratings are usually horribly skewed by all the cheating that happens on there.</p>
 8309: <p>Adam Hair has a rating list for weaker engines:</p>

<p><a href="http://adamsccpages.blogspot.com/p/also-rans-rating-list.html" rel="nofollow">http://adamsccpages.blogspot.com/p/also-rans-rating-list.html</a></p>

<p>Grizzly and Chenard are UCI, but a lot of the weaker engines tend to be CECP.</p>
