Re: [gnugo-devel] EB25 considered harmful

[Trevor Morris]

Please do remove it.  No need to even comment it out.  Just delete
it.
-Trevor

At 07:06 AM 1/4/2002 -0800, you wrote:
>
>I ran the regressions and got two crashes. These are
>13x13 test 80 and trevora test 300. Both patterns are
>in new pattern EB25.
>
>Backtrace below for 13x13 test 80. Crash is in new pattern EB25
>with the anchor at N3 in this position:
>
>   A B C D E F G H J K L M N
>13 . . . X . . . . . . . . . 13
>12 . O X . X . . . . . . . . 12
>11 . . O X X . . . X . . . . 11
>10 . . O + . . + . . + X . . 10
> 9 . . O X . . . . . . . . . 9
> 8 . . . X . . X . . X . . . 8
> 7 . . O O X X + . X + . O . 7
> 6 . . . . O O O . . . X . . 6
> 5 . . . . . . . . O O O O O 5
> 4 . . O + . . + . . X X X O 4
> 3 . . . . O . . O . . . . X 3
> 2 . . . . . . . . . . X . . 2
> 1 . . . . . . . . . . . . . 1
>   A B C D E F G H J K L M N
>
>The problem is that the pattern doesn't contain a * so when 
>we get to line 58 of connections.c we get a crash. Other
>B patterns in conn.db have a * location marked.
>
>I had revised this pattern per Gunnar's comment. It
>currently reads:
>
>Pattern EB25
># tm New Pattern (3.1.20)
>
>O!.  cutable keima on edge.
>.!O
>.!.
>---
>
>:8,B
>
>Obc
>daf
>.!.
>---
>
>; !xplay_attack_either(a,b,c,a,c) ||
>; !xplay_attack_either(b,a,d,b,d)
>
>Yesterday I pointed out another problem with the pattern in
>that the second constraint looks wrong---usually if x
>plays b O can secure a connection at d instead of a
>even if there is a stone one point to the left of d.
>
>I propose we take the pattern out of the CVS for the
>time being then revise it.
>
>Dan
>
>#0  0x400bfa01 in __kill () from /lib/i686/libc.so.6
>#1  0x400bf7da in raise (sig=6) at ../sysdeps/posix/raise.c:27
>#2  0x400c0f82 in abort () at ../sysdeps/generic/abort.c:88
>#3  0x0805663d in do_trymove (pos=214, color=1, ignore_ko=0) at board.c:537
>#4  0x080561e5 in trymove (pos=214, color=1, message=0x80d5eda "safe_move-A", 
>    str=0, komaster=0, kom_pos=0) at board.c:392
>#5  0x0808f8e5 in safe_move (move=214, color=1) at reading.c:5410
>#6  0x0809e4b1 in cut_connect_callback (m=10, n=12, color=2, 
>    pattern=0x80eb104, ll=7, data=0x0) at connections.c:58
>#7  0x0806ce16 in do_matchpat (m=10, n=12, callback=0x809ea20 <cut_callback>, 
>    color=2, pattern=0x80eb104, callback_data=0x0, goal=0x0) at matchpat.c:580
>#8  0x0806cebf in matchpat_loop (callback=0x809ea20 <cut_callback>, color=2, 
>    anchor=2, pdb=0x80ed10c, callback_data=0x0, goal=0x0) at matchpat.c:621
>#9  0x0806d774 in matchpat (callback=0x809ea20 <cut_callback>, color=6, 
>    pdb=0x80ed10c, callback_data=0x0, goal=0x0) at matchpat.c:1071
>#10 0x0809eab7 in find_cuts () at connections.c:259
>#11 0x08075e91 in make_domains (b_eye=0x84c8c80, w_eye=0x84d32a0, owl_call=0)
>    at optics.c:214
>#12 0x080600e6 in make_dragons (color=1, stop_before_owl=0) at dragon.c:112
>#13 0x08064495 in examine_position (color=1, how_much=99) at genmove.c:135
>#14 0x08064916 in do_genmove (move=0xbffff748, color=1, 
>    pure_threat_value=0.400000006) at genmove.c:326
>#15 0x08064788 in genmove (i=0xbffff774, j=0xbffff778, color=1)
>    at genmove.c:260
>#16 0x0805205f in load_and_analyze_sgf_file (head=0x8657bc0, 
>    gameinfo=0xbffff870, untilstr=0xbffffcc5 "41", benchmark=0, to_move=1)
>    at play_solo.c:163
>#17 0x0804a386 in main (argc=9, argv=0xbffffb24) at main.c:824
>#18 0x400ad507 in __libc_start_main (main=0x80491d0 <main>, argc=9, 
>    ubp_av=0xbffffb24, init=0x8048d4c <_init>, fini=0x80c8160 <_fini>, 
>    rtld_fini=0x4000dc14 <_dl_fini>, stack_end=0xbffffb1c)
>    at ../sysdeps/generic/libc-start.c:129
>
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