Emanuele Cisbani wrote: > 2007/12/5, Gunnar Farnebäck <[EMAIL PROTECTED]>: > [...] >> In this case which is already settled PASS is an allowed >> answer but also other moves which bring black further ahead in the >> semeai are accepted. > [...] > > If black play A9 or C9 reduce his territory by one. > For this reason the best move IMHO should be only PASS.
The semeai reading isn't concerned with territory, only the result of the semeai. To choose move with respect to territory is the responsibility of the value_moves code. (Incidentally A9 and C9 do not lose territory, black is forced to play there eventually anyway. It's just not urgent.) > Ok, I accept that black remove the ko threat of withe. > And we can assign to this move a value >= 1. GNU Go doesn't give it a positive value, it's only to the local semeai analysis that wants to report that it does something good. > But on this assumption we should accept also withe > ko treath like valid moves: > > 2 analyze_semeai A10 A11 > #? [0 0 (PASS|A12|B12|C12)] > > Sorry, but where is my mistake? It's just a question of conventions. GNU Go reading functions are designed not to return a move when they fail with their objective. > -=- > > Second question: the first test > > 1 analyze_semeai A11 A10 > > has this result: > > 1 FAILED: Correct '1 1 (PASS|A9|C9)', got '1 1 F9' > > Do we need a restricted_analyze_semeai function? > :-) Right, this is a very bad test of GNU Go semeai knowledge. What happens here is that the tactical reading sees that A10 is captured no matter what, so A11 and and D10 are joined into a single dragon. Then when asked for a defense move for the dragon at A11, it finds F9 which extends from the D10 string. When analyzing the board it wouldn't consider this a semeai at all and thus not call the semeai reading. I'm not sure how best to handle this test, possibly change it to tactical reading tests, but for now you can leave it and make a note about the problem. In general the interaction between tactical reading and semeai reading is complicated when there are few liberties in the semeai. Sometimes the tactical reading gets it wrong and fools up everything. With sufficient liberties the tactical reading doesn't get involved and the semeai reading can do its work as intended. /Gunnar _______________________________________________ gnugo-devel mailing list [email protected] http://lists.gnu.org/mailman/listinfo/gnugo-devel
