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We are installing the Gull engine for some chess enthusiasts in an organization. We would like to set 6 difficulty levels from beginner to master using depth. Is there someone who can advice us about which values are the most accurate and progressive for each level?

  • Can you just do 3,4,5,6,7,8 etc? – SmallChess Jun 28 '16 at 7:26
  • depth is the number of half moves the search nominally looks ahead, so it's a little bit hard to define. Middle game junior usually gets 14-16 depth to be competitive – Siberian Scout Jun 28 '16 at 8:14
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You may find this post by the developers of the website https://lichess.org/ helpful.

Although they use Stockfish as the engine, they set the search depths as such (note that they have eight levels of play):

  • AI level 1: skill 3/20, depth 1, 50ms
  • AI level 2: skill 6/20, depth 2, 100ms
  • AI level 3: skill 9/20, depth 3, 150ms
  • AI level 4: skill 11/20, depth 4, 200ms
  • AI level 5: skill 14/20, depth 6, 250ms
  • AI level 6: skill 17/20, depth 8, 300ms
  • AI level 7: skill 20/20, depth 10, 350ms
  • AI level 8: skill 20/20, depth 12, 400ms

I have personally played and seen others play against the varying levels. Level 1 is almost joke worthy--the computer may move his queen completely into danger, completely miss checkmates, etc.

On the other hand, level eight is crushing; beating it requires repeated practice over the same line (at least, that is the only way I've seen people beat it).

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