rook-corners-1.cql

// Download rook-corners-1.cql
// PGN output when run on sample.pgn

/*********
look for rook visiting the four corners
**********/

cql( input heijden.pgn )
initial
 piece Candidate in R{
  find Candidate==a1
  find Candidate==a8
  find Candidate==h1
  find Candidate==h8
}