Complicating code in C#

[Henk]

O no I defined another dirty enum

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     enum SlidingType { Straight, Diagonal };

[Henk]

To make ICoordset : IEnumerable<ICoord> I had to implement GetEnumerator for CoordSet64. But looks like it is a main computational bottleneck.

Don't know what to do about it. Make representation a List<ICoord> perhaps instead of a bitboard (uint64) . Doubt if that would make it faster.
For you have intersection and union operation. So maybe a sortedlist<ICoord> I don't know yet.

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      public IEnumerator<ICoord> GetEnumerator()
        {
            var bbIter = new BitboardIterator(bb);
            foreach (var bit in bbIter)
            {
                yield return new BitBoardCoord(bit);  // far too slow
            }
        }
  

[Henk]

O wait maybe it is the Log operation.

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        public BitBoardCoord(ulong bit)
        {
            Index = (int)Math.Log(bit, 2);
        }
   

[Henk]

Another terrible slow operation.

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      public static ulong ConvertToBitBoard(ICoordSet coordSet)
        {
            ulong result = 0;
            foreach (var coord in coordSet)
            {
                var bb = ConvertToBitBoard(coord);
                result |= bb;
            }
            return result;
        }
 

To fix this I have to repair at least 120 compile errors.
Coding horror movie never stops.

By the way argument should have been CoordSet64 and not ICoordSet.
So that will be another gazillion type casting errors.

[Henk]

If ICoordSet: IEnumerable<ICoord> I can use Intersect and Union operation from LinQ.
Problem is that it returns an IEnumerable<ICoord> and not an ICoordSet or a CoordSet64.

So I can expect even more compile errors.

When will it compile? Maybe next week. After that remove run time errors and then find out that movegeneration is another two times lower.