XXV. Continuation of the collection of ingenious chess games, endgames and problems. With some diagrams. XIV, 247 pages. Original cardboard with illustrated front cover.
XXVI. Continuation of the collection of ingenious chess games, endgames and problems. With some diagrams. VIII (from XIII), 218 pages, Original cardboard with illustrated front cover.
XXVII. Continuation of the collection of ingenious chess games, endgames and problems. With some diagrams. X, 208 & 52 pages. Original cloth binding with illustrated front cover.