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From: | SP lee |
Subject: | [gnugo-devel] Semeai:60 traced |
Date: | Thu, 15 Jan 2004 20:55:13 -0800 |
I have traced semeai:60 after applied
Paul's patch for filling bulky eyes http://mail.gnu.org/archive/html/gnugo-devel/2004-01/msg00065.html and my patch for ignoring certain lunches
http://mail.gnu.org/archive/html/gnugo-devel/2004-01/msg00111.html.
I could overlook something, but I come to
some fundamental parts again. Here is what happened. First 3 moves white and
black tried are correct: W:H5 B:B8 W:H4
A B C D E F G H J
9 . X X X X X X X X 9 8 X X O . . . . . . 8 7 X O O O O O O O O 7 6 . X . O X X X X X 6 5 . . X X O X . O . 5 4 . . . . O X X O . 4 3 . . X X O . X X X 3 2 . . X O . O O O O 2 WHITE (O) has captured 0 stones 1 . . . . O . . . . 1 BLACK (X) has captured 0 stones A B C D E F G H J Then black tried F3 (!) which was claimed as winning move by tactical reading, yet of course made black losing semeai. In detail, there is something wrong when
do_owl_analyze_semeai was trying to find tactical defense of E6:
if (attack(semeai_worms[sworm], NULL) && find_defense(semeai_worms[sworm], &upos)) { critical_semeai_worms[sworm] = 1; owl_add_move(moves, upos, 85, "defend semeai worm", 1, 0, NO_MOVE, MAX_SEMEAI_MOVES); TRACE("Added %1m %d (0)\n", upos, 85); } The tried moves of find_defense were: B:F3, W:G5, B:D4 (breaking chain), W:E2 (in attack2). Then black tried both J5 and J4 and losed.
Yet white has to try attack2 with black tenuki. When white tried J5, black
captured white with J4 in fast_defense in defend1 and claimed
victory.
Maybe F3 is just a move to be tried,
but the semeai module still think it's the best move for black at that
moment and didn't try anything else.
So I come to the fundamental part, i.e.
fast_defense. Is it good to draw conclusion there? I think I have to wait the
above to be confirmed before trying to make any solution.
SP Lee
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semeai60trace.txt
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