"Chess problems." . . "Puzzles." . . . . . . . . . . . . . . "The puzzle king : Sam Loyd's chess problems and selected mathematical puzzles" . "Sam Loyd's chess problems and selected mathematical puzzles"@en . "The puzzle king : Sam Loyd's chess problems and selected mathematical puzzles"@en . . . . "Problemschach." . . "Unterhaltungsmathematik." . . . .