Ruy López de Segura a match against Leonardo di Bona in Rome. In 1574–75 he lost the first known international chess tournament, which was held, at the invitation of King Philip II of Spain, at the Royal Court of Spain in El Escorial, close to Madrid, to Leonardo di Bona, a Calabrian lawyer, and to Paolo Boi, but placing ahead of 4th (and last) place finisher Alfonso Ceron. The Ruy Lopez Opening (1.e4 e5 2.Nf3 Nc6 3.Bb5) is named after him, as is a variation in the Petroff Defence (1.e4 e5 2.Nf3 Nf6 3.Nxe5 Qe7). Ruy López de Segura Rodrigo (Ruy) López de Segura
Tactical decision game consisted of scenarios that described situations faced by the commanders of battalions, companies, and platoons. In 1982, the Education Center of the United States Marine Corps Development and Education Command used this package as the starting point for a series of three "instructional pamphlets": "Tactical Problems for Battalion Commanders", "Tactical Problems for Platoon Leaders/Company Commanders", and "Tactical Problems for Squad Leaders". In addition to twelve problems taken from "What Now, Lieutenant?", the "Tactical Problems ..." series contained sixteen games that were written expressly for the series by Chief Warrant Officer Bryan N. Lavender, USMC. Like the scenarios in "What Now,