From cd556bcca36976d878209f3383deae96502270d4 Mon Sep 17 00:00:00 2001
From: Petr Baudis <pasky@ucw.cz>
Date: Thu, 1 Oct 2009 19:47:18 +0200
Subject: [PATCH] coord_is_adjecent(): Introduce

---
 board.c | 3 +--
 move.h  | 2 ++
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/board.c b/board.c
index aa8f6b2..c45f54a 100644
--- a/board.c
+++ b/board.c
@@ -1086,8 +1086,7 @@ is_bad_selfatari_slow(struct board *b, enum stone color, coord_t to)
 			return false;
 		/* ...or one liberty, but not lib2. */
 		if (groupcts[S_NONE] > 0
-		    && abs(lib2 - to) != 1
-		    && abs(lib2 - to) != board_size(b))
+		    && !coord_is_adjecent(lib2, to, b))
 			return false;
 
 		/* ...ok, then we can still contribute a liberty
diff --git a/move.h b/move.h
index 955c33c..36cf8fc 100644
--- a/move.h
+++ b/move.h
@@ -23,6 +23,8 @@ static coord_t resign = -2;
 #define coord_xy(board, x, y) ((x) + (y) * board_size(board))
 #define coord_xy_otf(x, y, board) coord_xy(board, x, y) // obsolete
 
+#define coord_is_adjecent(c1, c2, b) (abs(c1 - c2) == 1 || abs(c1 - c2) == board_size(b))
+
 /* dyn allocated */
 static coord_t *coord_init(int x, int y, int size);
 static coord_t *coord_copy(coord_t c);
-- 
2.11.4.GIT