Ruy Lopez Ajedrez", written in 1561. Although it bears his name, this particular opening was included in the Göttingen manuscript, which dates from c. 1490. However, popular use of the Ruy Lopez opening did not develop until the mid-19th century, when Carl Jaenisch, a Russian theoretician, "rediscovered" its potential. The opening remains the most commonly used amongst the open games in master play; it has been adopted by almost all players during their careers, many of whom have played it with both colours. Due to the difficulty for Black in achieving equality, a common nickname for the opening is "The Spanish Torture".
Comparison of Portuguese and Spanish in both languages, but the stress falls on different syllables: Although the vocabularies of Spanish and Portuguese are similar, the two languages differ phonologically from each other, very likely because of the stronger Celtic substratum in Portuguese. Phonetically Portuguese bears similarities to French and to Catalan while the phonetics of Spanish are more comparable to those of Sardinian and Sicilian. Portuguese has a significantly larger phonemic inventory than Spanish. This may partially explain why it is generally not very intelligible to Spanish speakers despite the lexical similarity between the two languages. One of the main differences between the Spanish and