user7967: Do computers play in ordinary human grandmaster chess tournaments with time limits at 40 moves in two hours etc? If so how do they fare?

user7297: No, they don't, because it wouldn't be fair. According to Wikipedia:

A recent top chess engine, Rybka, has an estimated Elo rating of about 3200 (when running on an up-to-date PC, as computed by SSDF).

This is about 500-600 points higher than an average grandmaster (rating 2600-2700). This would be the same rating difference as between a grandmaster and a top club player (2000-2200) - it is a totally different playing category.
According to how the ELO rating is set up, the expected score of a 2600 grandmaster vs. a 3200 computer is 3% - i.e. when they play 100 games, the grandmaster is expected to draw only 6 games. This is way too low to be interesting.

7967: <p>Do computers play in ordinary human grandmaster chess tournaments with time limits at 40 moves in two hours etc? If so how do they fare?</p>
 7297: <p>No, they don't, because it wouldn't be fair. According to <a href="https://en.wikipedia.org/wiki/Computer_chess#Computers_versus_humans" rel="nofollow">Wikipedia</a>:</p>

<blockquote>
  <p>A recent top chess engine, Rybka, has an estimated Elo rating of about 3200 (when running on an up-to-date PC, as computed by SSDF).</p>
</blockquote>

<p>This is about 500-600 points higher than an average grandmaster (rating 2600-2700). This would be the same rating difference as between a grandmaster and a top club player (2000-2200) - it is a totally different playing category.</p>

<p>According to how the ELO rating is set up, the <a href="https://en.wikipedia.org/wiki/Elo_rating_system#Mathematical_details" rel="nofollow">expected score</a> of a 2600 grandmaster vs. a 3200 computer is 3% - i.e. when they play 100 games, the grandmaster is expected to draw only 6 games. This is way too low to be interesting.</p>
