diff --git a/pattern2.cpp b/pattern2.cpp
index dbd371a9..878a5c69 100644
--- a/pattern2.cpp
+++ b/pattern2.cpp
@@ -49,6 +49,13 @@ bool ishex2(cell *c) {
   else return c->type != S6;
   }
 
+int chessvalue(cell *c) {
+  if(syntetic) 
+    return synt::chessvalue(c);
+  else
+    return celldist(c) & 1;
+  }
+
 int emeraldval(heptagon *h) { return h->emeraldval >> 3; }
 
 int emeraldval(cell *c) {
@@ -723,7 +730,7 @@ namespace patterns {
     }
 
   void val_all(cell *c, patterninfo &si, int sub, int pat) {
-    if(irr::on) si.symmetries = 1;
+    if(irr::on || syntetic || binarytiling) si.symmetries = 1;
     else if(a46) val46(c, si, sub, pat);
     else if(a38) val38(c, si, sub, pat);
     else if(sphere) valSibling(c, si, sub, pat);
@@ -1038,7 +1045,7 @@ namespace patterns {
     
     else if(pat == PAT_CHESS) {
       val_nopattern(c, si, sub);
-      si.id = celldist(c) & 1;      
+      si.id = chessvalue(c);
       }
 
     else 
diff --git a/syntetic.cpp b/syntetic.cpp
index a80e00ba..3a3fca0d 100644
--- a/syntetic.cpp
+++ b/syntetic.cpp
@@ -6,6 +6,8 @@ namespace synt {
 
 static const int sfPH = 1;
 static const int sfLINE = 2;
+static const int sfCHESS = 4;
+static const int sfTHREE = 8;
 
 // Marek-snub
 vector<int> faces = {3, 6, 6, 6};
@@ -13,7 +15,7 @@ vector<int> adj = {1, 0, 2, 3};
 vector<bool> invert = {false, false, true, false};
 vector<int> nflags = {sfPH | sfLINE, 0, 0, 0};
 
-bool have_ph, have_line, have_symmetry;
+bool have_ph, have_line, have_symmetry, have_chessboard;
 
 int repetition = 1;
 int N;
@@ -597,6 +599,10 @@ bool pseudohept(int id) {
   return flags[id] & synt::sfPH;
   }
 
+bool chessvalue(cell *c) {
+  return flags[id_of(c->master)] & synt::sfCHESS;
+  }
+
 bool linespattern(cell *c) {
   return flags[id_of(c->master)] & synt::sfLINE;
   }