Re: [gnugo-devel] Computing illegal influence

[Arend Bayer]

> If I run gnugo -l [game.sgf] --quiet --replay white on the following
> game record I get a message:
> 
> Computing influence for illegal move J2 (move number 262)
  
Btw, I think this message should be replaced (in 3.3) by an assertion
dependend on GG_FULL_ASSERT. (Currently compute_move_influence silently
returns after reporting this TRACE message.) It's clearly an assertion
that can show important problems to us, but would effectively reduce
stability.

> I'm not sure why this is since move 262 is a black move, not a white
> one. I don't get the message if I simply load the game record at
> any of the moves 261, 262 or 263.
This happens at move 263 (the move number is misleading). You can reproduce
it with 

loadsgf game.sgf 261
genmove_white
black K2
genmove_white

The trace output directly before the above message is
  J2: owl attack/defend for E7
  J2: owl attack/defend for F2

This is due to the persistent owl cache entry below.

Arend


owl_defend E7, result 3 J2 (6, 1524 nodes, 0.09 seconds)
 Stored result in cache (entry 20):
movenum         = 260
tactical_nodes  = 1524
routine         = OWL_DEFEND
(apos)          = E7
(bpos)          = PASS
(cpos)          = PASS
result          = 3
(move)          = J2
(move2)         = PASS
   A B C D E F G H J K L M N O P Q R S T
19 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 19
18 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 18
17 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 17
16 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 16
15 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 15
14 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 14
13 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 13
12 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 12
11 ? ? ? ? ? x ? ? ? ? ? ? ? ? ? ? ? ? ? 11
10 . ? . x x . . ? ? ? ? ? ? ? ? ? ? ? ? 10
 9 ? ? x . . . x . ? ? ? ? ? ? ? ? ? ? ? 9
 8 ? x . x . x ? ? . ? ? ? ? ? ? ? ? ? ? 8
 7 ? x . .[o]o x ? . ? ? ? ? ? ? ? ? ? ? 7
 6 . . . x x o x ? ? ? ? ? ? ? ? ? ? ? ? 6
 5 ? ? . . x o o x ? ? ? ? ? ? ? ? ? ? ? 5
 4 ? ? X X o o x ? ? ? ? ? ? ? ? ? ? ? ? 4
 3 ? ? X o o . o x x ? ? . ? ? ? ? ? ? ? 3
 2 ? ? X o . o x x . x ? ? ? ? ? ? ? ? ? 2
 1 ? ? X o x x . ? x ? ? ? ? ? ? . ? ? ? 1
   A B C D E F G H J K L M N O P Q R S T
owl_attack H5, result 0 PASS (22, 4897 nodes, 0.33 seconds)