In the game info screen there is an option for time limits, but for the life of me I can't get them to work. The rule subset is also "greyed out" and can't be changed. i have looked and looked but can't find any setting to adjust them. Anyone know how?

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"Hell if you understand everything I said, you’d be me." ~ Miles Davis ~

I recall reading elsewhere recently that gnugo doesn't respect timelimits anyway.

Sente's Goban for Mac is also a go server where you can play other people on your same network. I've never used it that way yet, but I'm sure the time/rule settings would work in that case.

Brief explanation.

All of the programs that both have "levels" and properly respect time controls (and successfully, do not let themselves lose on time) must have a component to analyze the power of the machine upon which they find themselves running. Then based upon the results of the "benchmark" test and the time settings and the level can set parameters for the current game.

Notice that even this can lead to bad result (loss by time) should some other process start on the machine that consumes processing resources. So a really good job would keep monitoring what percentage of the CPU its process had and adjust as necessary.

When somebody says "program X can play at strength Y" the statement is not particulary informative unless also specifying the time control and the power of the machine.