I made a test for the Stockfish development version dated May 20, 2013 to assess whether it made progress in the 3 weeks time since the official release version of Stockfish 3. The outcome was amazing because it demolished the top 4 in the Owl Rating List, namely Houdini 3 Pro, Stockfish 3 (official version), Robodini 1.1 and Critter 1.6a with a comfortable margin.
Here is the gauntlet statistics:
|1||Stockfish 130520 x64||24||400||55.00||220.0||127||87||186|
|2||Stockfish 3 x64||2||100||45.50||45.5||9||18||73|
|3||Robodini 1.1 x64||-7||100||45.50||45.5||29||38||33|
|4||Houdini 3 Pro x64||-7||100||45.00||45.0||29||39||32|
|5||Critter 1.6a x64||-11||100||44.00||44.0||20||32||48|
Please note that the above table is a gauntlet where Stockfish 130520 is the star engine. This is not a round robin tournament.
In several matches between Houdini and Stockfish I've made so far, the later development version of Stockfish easily matched the strength of Houdini. In terms of scoring power however, Houdini is brutal against all the other chess engines, so this version may not be number 1 in the rating lists yet. But...watch out, it may be number 1 soon!
This is not an official result and is only published for curiosity. The result is good enough for my testing environment but may not be the same in another tester's conditions.
Download the computer chess engines tournament games here.