and pawn, queen versus rook, rook and pawn versus rook (including the Philidor position), queen and pawn versus queen, queen versus pawn on the seventh rank, knight versus pawn, two pawns versus one pawn, and two isolated pawns versus two connected pawns . In the eighteenth century important books were written by Italians (the "Modenese Masters") Domenico Lorenzo Ponziani, Ercole del Rio (1750), and Giambattista Lolli (1763) . Lolli's book was based on del Rio's work and was one of the most important for the next 90 years. He studied the endgame of a queen versus two bishops and agreed with the earlier opinion of Salvio that it was generally a draw. Later this was overturned by computer endgame tablebases, when Ken Thompson found a 71-move solution. However, Lolli did find the unique position of mutual zugzwang in this endgame (see diagram) , . Lolli's 315-page book was the first giving practical research. His material came from several sources, including analysis by Philidor . In 1766 Carlo Cozio published analysis of 127 endgame positions, but it was not a practical handbook . In 1851 Bernhard Horwitz and Josef Kling published Chess Studies, or endings of games, which contained 427 positions. In 1884 Horwitz added more than fifty positions to the book, retitled it Chess Studies and End-Games, and completely omitted Kling's name . Other important books were Fins de parties d'echecs by Phillipe Ambroise Durand and Jean-Louis Preti in 1871, and Teoria e pratica del giuoco degli scacchi by Signor Salvioli in 1877 . Horowitz and Kling's analysis of the endgame of two bishops versus a knight had been questioned, and was eventually overturned by computer databases (see pawnless chess endgame) . In 1864 Alfred Crosskill published analysis of the endgame of rook and bishop versus rook, an endgame that has been studied at least as far back as Philidor in 1749 . Howard Staunton in The Chess-Player's Handbook, originally published in 1847, included almost 100 pages of analysis of endgames . His analysis of the very rare rook versus three minor pieces endgame is surprisingly sophisticated. Staunton wrote, "Three minor Pieces are much stronger than a Rook, and in cases where two of them are Bishops will usually win without much difficulty, because the player of the Rook is certain to be compelled to lose him for one of his adversary's Pieces. If, however, there are two Knights and