patterns/defense.db

# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# This is GNU Go, a Go program. Contact gnugo@gnu.org, or see       #
# http://www.gnu.org/software/gnugo/ for more information.          #
#                                                                   #
# Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,   #
# 2008 and 2009 by the Free Software Foundation.                    #
#                                                                   #
# This program is free software; you can redistribute it and/or     #
# modify it under the terms of the GNU General Public License       #
# as published by the Free Software Foundation - version 3,         #
# or (at your option) any later version.                            #
#                                                                   #
# This program is distributed in the hope that it will be           #
# useful, but WITHOUT ANY WARRANTY; without even the implied        #
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR           #
# PURPOSE.  See the GNU General Public License in file COPYING      #
# for more details.                                                 #
#                                                                   #
# You should have received a copy of the GNU General Public         #
# License along with this program; if not, write to the Free        #
# Software Foundation, Inc., 51 Franklin Street, Fifth Floor,       #
# Boston, MA 02111, USA                                             #
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
#  defense.db - pattern database for finding tactical defense moves
#
#  The tactical reading functions try to defend by playing on the
#  immediate liberties only. This database is intended to find
#  additional defense moves. Notice though that these patterns doesn't
#  help the tactical reading to find defense moves later in a move
#  sequence but only at stackp=0.
#
#  See patterns.db for a specification of the current database format.
#
#  Since these patterns are matched during make_worms() it doesn't
#  make any sense to use classifications such as X and O. No other
#  classification than D is useful either since we only have tactical
#  defense moves here.
#
#  The semantics of these patterns are that the move at * is tried
#  as a defense for each attackable O string in the pattern.
#  The patterns are matched with either player as O.
#
#  FIXME: There are still some redundant patterns.
#
##################################################################


attribute_map none

goal_elements none
callback_data O


Pattern Def1

X*
Ox

:8,D

X*
Ox

;olib(*)>1


Pattern Def2
# Require that the common tesuji at b doesn't invalidate this defense move.

O.*
O..

:8,D

a.*
a.b

;attack(a) && oplay_defend(*,b,a)


Pattern Def4

XOO?    capture one stone
OX..
O.*?
?.??

:8,D


Pattern Def5

OXoO    connect under
O*..
....
----

:8,D


Pattern Def6

OXXO    connect under (the connection may or may not be broken)
O.*.
....
----

:8,D


Pattern Def9

OX*O    cut!
.OX?

:8,D


Pattern Def10

XO?        connection pattern
*.O
?.?

:8,D


Pattern Def12

?O*X
o.XO
?O.X

:8,D


Pattern Def16

-----
...O?
*.OXO
XO.X?
?XX??

:8,D


Pattern Def17

+----
|.*oo
|O.o?     defend with good eye shape
|XOOo
|XX??

:8,D


Pattern Def21

|oOO
|.X.
|.OX
|*XO
|.O?        capture to connect

:8,D

|oaa
|.X.
|.OX
|*XO
|.O?

;lib(a)>2


Pattern Def25

?XO           threaten to capture
?OX
..*
?O.

:8,D


Pattern Def26

O.O?           Bamboo joint for defense
O.*?

:8,D


Pattern Def28

?O?
Ox*         defend with eye shape
?O?

:-,D


Pattern Def29

?X?        make shape
.O.
...
.*.
?.?

:|,D


Pattern Def39

?X?.??       jump under
O..*.?
O....?
o....?
------

:8,D


Pattern Def44

??Xx?
XXO*.         override solid connection
OO...
.....
-----

:8,D


Pattern Def45

OOXX         push to capture X
.XO*
....
----

:8,D


Pattern Def49

??X?
O*.X         Draw back to defend connection
..OX
....
----

:8,D


Pattern Def50

??o?            hanging connection
?O.*
XXO.
----

:8,D


Pattern Def52

??????
?....x             jump into empty space
?.*.OO
?....x
??????

:8,D


Pattern Def55
# Not on edge

ooo
O.O      form eye to protect
.*X

:8,D


Pattern Def56

xXO             extend after hane
XO.
.*.
...

:8,D


Pattern Def57

..O
o*X
..O

:-,D


Pattern Def58

?????
....?          jump! (But not down to second line)
O.*.?
....?
X...?

:8,D


Pattern Def59

....           jump!
O.*.
....
X.X.

:8,D


Pattern Def60

OXO             block opponent
.*.
?.?

:|,D


Pattern Def61

?.?       extend to defend
.*.
XO?
X.?
XO?

:8,D


Pattern Def62

oOo?           attach
...?
.*X.
...?

:8,D


Pattern Def63

O.Oo
XO..     protect by drawing back
XX*O

:8,D


Pattern Def68

o.X?      try to defend by clamping to connect
OX*O
....
----

:8,D


Pattern Def69

OX*       atari on opponent to defend
?O.

:8,D

aC*
?b.

;lib(a)>1 && lib(b)>1 && lib(C)<=2 && olib(*)>1


Pattern Def70
# pp New Pattern - see endgame:860 (3.5.1)

OOOO*     a very specific position (defend the stone on the first line)
O....
XO...
-----

:8,D