[gnugo-devel] tsumego Evan Berggren Daniel

[Wolfgang Manner]

Evan Berggren Daniel was kind enough to send me the under the stones
problems which he scanned in from yutopian. i excluded 1 example
(aoc9) and looked at all the others.
first the conclusion:
problem no 1:
the life and death reading is
(to put it mildly)
unusable

before the first move
74 % of the status' of the relevant dragons are wrong
averaged over all moves
62 % of the status' are wrong
(99 % of those are called alive, but they should be critical)


now some details:

gnugo always plays the first move, if it is wrong i forced
the correct move, then i am playing the book

definitions:
m0 move not found
m1 move found with low priority (not highest move value)
m2 move found with highest move value in the corner
m3 move found

now for the last move i get
m0 0, m1 2, m2 3, m3 26

so most of the last moves are correct, but not all of them

for last - 1:
m0 2, m1 3, m2 9, m3 17

for last - 2:
m0 11, m1 4, m2 7, m3 9

so it gets worse fairly quickly


for the first move:
m0 24, m1 2, m2 1, m3 4

for the second move
m0 16, m1 4, m2 5, m3 6

so it gets slowly better



averaged over all moves:
m0 70, m1 18, m2 33, m3 72

finding the correct status and finding the correct move
is correlated:

all correct status'
m0 6, m1 5, m2 7, m3 53

all wrong status'
m0 57, m1 13, m2 25, m3 19

i dont think that this means very much, but it is still an indication

a serious problem is shown in the next picture:

    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 . . . . . . . . . . . . . . . . . . . 11
 10 . . . . . . . . . . . . . . . . . . . 10
  9 . . . . . . . . . . . . . . . . . . .  9
  8 . . . . . . . . . . . . . . . . . . .  8
  7 . . . . . . . . . . . . . . . . . . .  7
  6 . . . . . . O . . . . . . . . . . . .  6
  5 . . . . O . . O . . . . . . . . . . .  5
  4 . O . + . X X O . + . . . . . + . . .  4
  3 . . O O O X X X O . . . . . . . . . .  3
  2 . O X X X . . X O . . . . . . . . . .  2
  1 . O X X . . X X . . . . . . . . . . .  1
    A B C D E F G H J K L M N O P Q R S T

the dragon at c1 is critical, but the dragon at g1 is alive.
a white play at f2 will send everything to heaven







i have annotated the files, but since Evan didnt send the files around
for copy-right reasons, i wont do that either. However, if he agrees,
i can send it to people individually.

so i think one should work very hard to improve that.
(i guess you have already invested about 100 man years in
this business)

all the best
wolfgang