public void CornerTest()
{
var corners = Patterns.CombinedSymmetries("a1".ToBitBoard());
var positions = corners.ToAlgebraicNotationList();
corners.Draw();
Assert.IsTrue(positions.Contains("a1"));
Assert.IsTrue(positions.Contains("h1"));
Assert.IsTrue(positions.Contains("a8"));
Assert.IsTrue(positions.Contains("h8"));
}