diff --git a/src/tools/counter_symsi.cpp b/src/tools/counter_symsi.cpp
index 3340f35..dca21f7 100644
--- a/src/tools/counter_symsi.cpp
+++ b/src/tools/counter_symsi.cpp
@@ -30,33 +30,78 @@ main(int argc, char** argv)
     }
 
     int n = std::stoi(argv[1]);
+    int N = 16*n+16;
 
-    Game game(2+n*2);
+    Game game(2+n*10);
     game.vec_init();
 
-    /* create n+1 pieces */
+    /* create n pieces */
     for (int i=0; i<n; i++) {
-        game.init_vertex(2*i, 3+2*i, 0);
-        game.init_vertex(2*i+1, 4+2*i, 1);
-
+        int a = 10*i+0;
+        int d = 10*i+1;
+        int c = 10*i+2;
+        int e = 10*i+3;
+        int m = 10*i+4;
+        int f = 10*i+5;
+        int g = 10*i+6;
+        int k = 10*i+7;
+        int h = 10*i+8;
+        int l = 10*i+9;
+        /* a */ game.init_vertex(a, N+2*i-1, 0);    
+        /* d */ game.init_vertex(d, N+2*i,   1);
+        /* c */ game.init_vertex(c, 14*i+1,  0);
+        /* e */ game.init_vertex(e, 14*i+4,  1);
+        /* m */ game.init_vertex(m, 14*i+3,  0);
+        /* f */ game.init_vertex(f, 14*i+6,  1);
+        /* g */ game.init_vertex(g, 14*i+8,  1);
+        /* k */ game.init_vertex(k, 14*i+11, 0);
+        /* h */ game.init_vertex(h, 14*i+10, 1);
+        /* l */ game.init_vertex(l, 14*i+13, 0);
     }
-    game.init_vertex(2*n, 1, 0);
-    game.init_vertex(2*n+1, 2, 1);
-    game.vec_add_edge(2*n, 2*n);
-    game.vec_add_edge(2*n+1, 2*n+1);
-    
+
+    game.init_vertex(10*n,   1,       0);
+    game.init_vertex(10*n+1, N+2*n+2, 1);
+
     /* connect the pieces */
     for (int i=0; i<n; i++) {
-        game.vec_add_edge(2*i, 2*i+2);
-        game.vec_add_edge(2*i, 2*i+3);
-        game.vec_add_edge(2*i+1, 2*i+2);
-        game.vec_add_edge(2*i+1, 2*i+3);
-        if (i>=1) {
-            game.vec_add_edge(2*i+0, 0);
-            game.vec_add_edge(2*i+1, 1);
-        }
+        int a = 10*i+0;
+        int d = 10*i+1;
+        int c = 10*i+2;
+        int e = 10*i+3;
+        int m = 10*i+4;
+        int f = 10*i+5;
+        int g = 10*i+6;
+        int k = 10*i+7;
+        int h = 10*i+8;
+        int l = 10*i+9;
+
+        game.vec_add_edge(a, c);
+        game.vec_add_edge(d, h);
+        game.vec_add_edge(c, e);
+        game.vec_add_edge(c, m);
+        game.vec_add_edge(c, 0);
+        game.vec_add_edge(m, f);
+        game.vec_add_edge(m, c);
+        game.vec_add_edge(m, 0);
+        game.vec_add_edge(g, k);
+        game.vec_add_edge(g, h);
+        game.vec_add_edge(g, 1);
+        game.vec_add_edge(h, l);
+        game.vec_add_edge(h, g);
+        game.vec_add_edge(h, 1);
+        game.vec_add_edge(e, m);
+        game.vec_add_edge(e, a+10);
+        game.vec_add_edge(f, c);
+        game.vec_add_edge(f, d+10);
+        game.vec_add_edge(k, h);
+        game.vec_add_edge(k, a+10);
+        game.vec_add_edge(l, g);
+        game.vec_add_edge(l, d+10);
     }
 
+    game.vec_add_edge(10*n,   10*n);
+    game.vec_add_edge(10*n+1, 10*n);
+
     game.vec_finish();
     game.write_pgsolver(std::cout);
 }