rank

The rank filter is a numeric filter that takes a single set filter as argument:

    rank a1 == 1
    rank c3 == 3

If the set of squares represented by its argument contains a single square s, then the value of the rank filter is the numeric value of the rank of s.

If the set of squares represented by its argument does not contain exactly one single square, then the rank filter does not match the current position.

The rank filter is not affected by transform filters like flip or rotate90 .

Examples

The rank filter is used in averagedistance.cql, chameleon.cql, flipverticalecho.cql, horizontallysymmetric.cql, platzwechselecho.cql, platzwechseln2.cql .