digraph Syzygy {
  KQBvKN -> KBvKN;
  KQBvKN -> KQvKN;
  KQBvKN -> KQBvK;
  KQBvK -> KBvK;
  KQBvK -> KQvK;
  KQvKN -> KNvK;
  KQvKN -> KQvK;
  KBvKN -> KNvK;
  KBvKN -> KBvK;
}