[Pachi] Unusual strategy

lemonsqueeze lemonsqueeze at free.fr
Sun Jan 17 22:39:03 CET 2016


Hi,

I came across an interesting one today:
   http://files.gokgs.com/games/2016/1/17/patcher-pachipachi.sgf

On move 65 black passes (!), then proceeds to win the game anyway (!!)

I'd be willing to let it get away with being bored or in "I'm so far 
ahead i'll just pass" mode, but log looks a bit peculiar:
(untruncated version attached)

IN: play w h18
(pondering) [1442600] best 0.422465 xkomi 0.0 ...
tree pruned in 0.58164 s, prev 89.9 s ago, dest depth 74 wanted 60, ...
temp tree overflow, max_tree_size 2097152000, pruning_threshold
   262144000
IN: genmove b
<pre-simulated 1568978 games>
(UCT tree; root white; extra komi 0.000000; max depth 0)
[H18] 0.578/1568978 [prior 0.066/151 amaf 0.577/4886390 crit 0.033 ...
(avg score 16.489624/0; dynkomi's 8.312315/10061278 value ...
genmove in 0.10s (0 games/s, 0 games/s/thread)
... No moves left

Anyone came across this before ?

Cheers,
Matt
-------------- next part --------------
IN: play w h18
(pondering) [1442600] best 0.422465 xkomi 0.0 | seq H18  K9 M16 M15 | can w H18(0.422) H15(0.414)  L9(0.408) H16(0.409) 
tree pruned in 0.58164 s, prev 89.9 s ago, dest depth 74 wanted 60, size 1159656672->524288832/524288000, playouts 1568978
temp tree overflow, max_tree_size 2097152000, pruning_threshold 262144000
IN: genmove b
Move:  64  Komi: 7.5  Handicap: 0  Captures B: 0 W: 0
      A B C D E F G H J K L M N O P Q R S T        A B C D E F G H J K L M N O P Q R S T  
    +---------------------------------------+    +---------------------------------------+
 19 | . . . . . . . . . . . . . . . . . . . | 19 | , , , , o o o o o o o , , o o o O O o |
 18 | . . . . . . . O)O O O X . . . . . O . | 18 | , , , , o o o o o o o , , o o O O O o |
 17 | . . . . . . . X X X O X . O . O O X . | 17 | , , , o , , , , , , o , , O O O O , , |
 16 | . . . O . . . . . O X . . . O X X . . | 16 | , , , O , , , , , , x , , , O x x , , |
 15 | . . . . . . . . . O X . X . O O X . . | 15 | , , , , , , , , , , x x X , O O x , , |
 14 | . . . . . . . . . O O X . . . X X . . | 14 | , , , , , , , , , , , X x , , x x , , |
 13 | . . X . . . . . X . X O X X . X O X . | 13 | , , x , , , , , X , x , X X x x o , , |
 12 | . . . . . . . . X . X O O O X . O O . | 12 | , , , , , , , , X , x , , , x , o o o |
 11 | . . . . . . . . . O . O . X O O O . . | 11 | , , , , , , , , , , , , , x o o o o o |
 10 | . . . . . . . . . . O O X . X . . . . | 10 | , , , , , , , , , , , , X x x , , o o |
  9 | . . . . . . . . . . . X X . . O . . . |  9 | , , , , , , , , , , , X X , , o o , , |
  8 | . . . . . . . . . . . . . . . . . . . |  8 | , , , , , , , , , , , , , , , , , , , |
  7 | . . . . . . . . . . . . . . . . . . . |  7 | , , , , , , , , , , , , , , , , , , , |
  6 | . . . . . . . . . . . . . . . . . . . |  6 | , , , , , , , , , , , , , , , , , , , |
  5 | . . . . . . . . . . . . . . . . . . . |  5 | , , , , , , , , , , , , , , , , , , , |
  4 | . . . . . . . . . . . . . . . X . . . |  4 | , , , x , , , , , , , , , , , X x , , |
  3 | . . . X . . . . . . . . . . . . . . . |  3 | , , x X x , , , , , , , , , , x , , , |
  2 | . . . . . . . . . . . . . . . . . . . |  2 | , x x x x , , , , , , , , , , , , , , |
  1 | . . . . . . . . . . . . . . . . . . . |  1 | , x x x x , , , , , , , , , , , , , , |
    +---------------------------------------+    +---------------------------------------+

<pre-simulated 1568978 games>
(UCT tree; root white; extra komi 0.000000; max depth 0)
[H18] 0.578/1568978 [prior 0.066/151 amaf 0.577/4886390 crit 0.033 vloss 0] h=0 c#=0 <b306a3c899e22e8f>
(avg score 16.489624/0; dynkomi's 8.312315/10061278 value 0.545702/10061278)
genmove in 0.10s (0 games/s, 0 games/s/thread)
... No moves left


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