[Bug-gnubg] Poll on tutor mode analysis level

[Philippe Michel]

Currently, tutor's default analysis level is 0 ply. It plays quite well in 
general but occasionally makes embarrassing errors that 2 plys doesn't.

It looks like most relatively recent machines (less that 5 years old, for 
instance) should be fast enough for a 2 ply analysis to be instantaneous 
or nearly so.

If you have tried world class level for tutor and went back to 0 ply, 
could you comment about it ? Was it unbearable or just a tad too slow for 
your taste ? Do you use a skill level that would warn you of gross 
blunders only or do you look at merely doubtful moves as well ? If you 
look at the suggested moves, do you reevaluate them at 2 ply ?