RE: computer-go: Go4++: Passing in tsume searches.

["Johan Roos (QEM)" <Johan.Roos@xxxxxxxxxxxxxxx>]

correction...

>Now, can anyone find a situation where *two* defender passes 
>are required?

considering suicides not allowed

   6 . . . . . . . .
   5 * * * * * . . .
   4 o o o o * . . . 
   3 * * . o * * * .
   2 . o * o o o * .
   1 * * * o . o * .
     A B C D E F G H

white must pass. if black plays the non optimal move A2. white must pass again.
after C3 white must answer with B2. i think situations like this can be created for arbitrarily many passes as non optimal moves often must be considered in searches.