I've thrown together a rudimentary pattern extractor and was looking
at 3x3 patterns taken from a collection of 9x9 games provided by Nici
Schraudolph. Each game was played through
in each of the four rotations and two reflections. Colors were
inverted every other move, so all of these patterns have black to
play in the center.
Looking at the data below, it appears that:
a) It might be better to somehow take into account the ratio between
how often the pattern appeared and how often the corresponding move
was played.
b) Endgame moves appear often, because they get played sooner or later.
c) Tesuji don't appear as often as one would hope. Connecting against
a peep, making a bamboo joint, and the diagonal cut are not among the
top patterns.
Let the thread begin!
The actual information:
134008 occurrences of
...
.?.
...
(Fair enough, you need a lot of these.)
9794 occurrences of
...
.?.
Bw.
(And similarly for the other 7 transformations of this. Hane.)
7444 occurrences of
...
.?.
.w.
(3 transformations. Contact play or attachment.)
7170 occurrences of
...
.?.
w..
(3 transformations. Shoulder hit.)
5512 occurrences of
###
.?.
Bw.
(7 transformations. Hane underneath -- is there another term?)
4840 occurrences of
...
w?.
Bw.
(3 transformations. Crosscut.)
4489 occurrences of
...
w?.
wB.
(7 transformations. Is there a name for this?)
4054 occurrences of
...
B?.
wB.
(3 transformations. Preventing a crosscut? Closed triangle?)
3922 occurrences of
...
.?.
wB.
(7 transformations. Anti-hane?)
3806 occurrences of
...
.?.
B..
(3 transformations. Diagonal connection.)
3656 occurrences of
###
.?.
BwB
(3 transformations. Connection underneath.)
3597 occurrences of
...
w?.
.B.
(7 transformations. Name?)
3197 occurrences of
...
w?.
BB.
(7 transformations. Another full triangle.)
3196 occurrences of
..#
.?#
Bw#
(7 transformations. Blocking on the first line -- VERY endgame.)
2986 occurrences of
###
B?.
wB.
(7. Connecting on the first line?)
2892 occurrences of
...
.?.
BwB
(3. Potentially a capture.)
2456 occurrences of
...
.?.
wBw
(3. The opposite of the previous pattern.)
2300 occurrences of
###
.?.
Bww
(7. Name?)
Peter Drake
http://www.lclark.edu/~drake/
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