Chess opening are so complex and theoretical that amateur players will have trouble understanding them. An example is the Perenyi Attack of the Sicilian Defense (see diagram) which yields an immensely complicated and tactical position that even strong players have difficulty handling, and that is beyond the comprehension of most amateurs. Major changes in the rules of chess in the late fifteenth century increased the speed of the game, consequently emphasizing the importance of opening study. Thus, early chess books, such as the 1497 text of Luis Ramirez de Lucena, present opening analysis, as does Pedro Damiano (1512), and Ruy López de
Tactical role-playing game the PlayStation, and Konami has announced a third title in development for the Nintendo DS. One of the first 32-bit tactical RPGs, "Guardian War", was developed by Micro Cabin and released in 1993 on the Panasonic 3DO. While the game lacked in story, it included many game mechanics that are seen throughout many of the 32-bit tactical RPGs; like isometric camera rotation, interchangeable and hybridization of "jobs" or "classes" for each character, the combination of moves between characters, and the capture of NPCs and having them play on your side. Sega's "Sakura Wars", released for the Sega Saturn in 1996,