Some new results:

League A
Critter 1.6a 111.5 / 120
Stockfish 3 100.5 / 120
IvanHoe 9.46h 95,5 / 120
Chiron 1.5 86,0 / 120
Shredder 12 75,5 / 120
HIARCS 13.2 70,5 / 120
Spike 1.4 68,0 / 120
Deep Sjeng WC 2008 55,0 / 120
EXchess 7.02b 44.5 / 120
Jonny 4.0 40,0 / 120
GNU Chess 5.5 40.0 / 120
Fruit 2 ...

Gull II beta and later versions are incompatible with ChessGUI (at least 0.240k). When running under ChessGUI Gull is 1.5-2.0 times slower than it should be. Can't understand how this is possible :(
To testers: please remove the games played under ChessGUI from rating lists.

Without taking a ...

kinderchocolate wrote: I think the UCI Limit in the Stockfish chess engine is broken, it just doesn't work.

You have to start a new game after reducing the strength, then it works.

I won't sell it, it is an open source project :) Everything you need to build your own is available here:

http://www.miclangschach.de/forum/

I have no better idea for reducing the strength of StockFish. In my opinion it is better to reduce the nodes instead of messing up the evaluation. This works ...

I tested your engines with a human (myself). I wouldn't play it with a long control, every game was played at 5 minutes or something like two seconds per move. Maybe you should try a bit more in shorter control. Nobody would bother to sit and play a computer for a standard control. I also don't ...

Thanks for the feedback. At what strength and timecontrol did you play?

I didn't observe silly mistakes, probably mainly because I tested with long timecontrol.

ChessGUI / 8RR / 3min+2sec / Ponder off / 128MB / 4-men EGTB / 2,13GHz

1. Critter 1.6a 115.5 / 120
2. Stockfish 2.3.1 108.5 / 120
3. IvanHoe 9.46h 103.0 / 120
4. Spike 1.4 80.0 / 120
5. Jonny 4.0 67.5 / 120
6. Fruit 2.3.1 61.5 / 120
7. Tornado 4.88 56.5 / 120
8. EXchess 6.71b 56.5 / 120
9 ...

It is of course dificult to compare. One human of1400 ELO maybe beats a computer of 1400 ELO easily, another human will lose. One will try some anti computer chess strategy, another is not aware of such things.

I just can try to get as close as possible to the human values. The ssdf values from the ...

The strength reduction is done only by limitation of the nodes per second. It works for SlowChess, with modern engines it is tricky because of presearch functions.

The tweaking is don by games against Emulations of dedicated machines in the range between 1450 and 2450 SSDF ELO. This games where ...

If a GUI has no special implementation of the limit strength feature the options UCI_LimitStrength and UCI_Elo should at least appear in the engineoptions menu.

Shredder has also a good implementation.