diff -r 41017d0a72c5 -r 84f2e380a434 src/chess/rules.c
--- a/src/chess/rules.c	Mon Jun 16 13:45:31 2014 +0200
+++ b/src/chess/rules.c	Mon Jun 16 15:41:06 2014 +0200
@@ -40,7 +40,7 @@
         *lastmovecopy = *(simulation.lastmove);
         simulation.movelist = simulation.lastmove = lastmovecopy;
     }
-        
+
     return simulation;
 }
 
@@ -421,13 +421,13 @@
                     }
                 } else {
                     /* bishop aspect */
-                    int dr = move->torow > move->fromrow ? 1 : -1;
-                    int df = move->tofile > move->fromfile ? 1 : -1;
+                    int dr = threat->torow > threat->fromrow ? 1 : -1;
+                    int df = threat->tofile > threat->fromfile ? 1 : -1;
 
-                    uint8_t row = move->fromrow;
-                    uint8_t file = move->fromfile;
-                    while (!canescape && file != move->tofile - df
-                        && row != move->torow - dr) {
+                    uint8_t row = threat->fromrow;
+                    uint8_t file = threat->fromfile;
+                    while (!canescape && file != threat->tofile - df
+                        && row != threat->torow - dr) {
                         row += dr;
                         file += df;
                         canescape |= is_protected(&simulation, row, file,