- eBookSerien: ChessCathy Draig
- eBookBishopCathy Draig
- eBookKingCathy Draig
- eBookRookCathy Draig
- eBookPawnCathy Draig
- eBookQueenCathy Draig
- eBookAntipositional Play, Chess InterludeCathy Draig
- eBookKnightCathy Draig
- eBookQuiet Move, Chess InterludeCathy Draig
- eBookBack Rank, Chess InterludeCathy Draig
- eBookForcing Move, Chess InterludeCathy Draig