digraph Syzygy {
  KRBNvK -> KBNvK;
  KRBNvK -> KRNvK;
  KRBNvK -> KRBvK;
  KRBvK -> KBvK;
  KRBvK -> KRvK;
  KRNvK -> KNvK;
  KRNvK -> KRvK;
  KBNvK -> KNvK;
  KBNvK -> KBvK;
}