: These lessons are prized for providing "novelties" created with computer engines like Rybka , offering lines that may not be found in standard chess books. Go to product viewer dialog for this item.

: Volumes near 117 often cover specialized strategy, such as positional sacrifices , pawn structures , and outposts , alongside the broader opening encyclopedia.

likely represents a specific segment of the multi-disk ECO series, which includes parts 1 through 6, often broken down further for digital storage.