USTCL 2023 R2: TEAM MARYLAND vs Team Puerto Rico and Olivari friends

The following text may be optionally used: Opening databases without engine evaluation and opening books are permitted in Daily Chess, but the use of engines and tablebases is never permitted. See here for the applicable rules: https://support.chess.com/article/648-what-do-i-need-to-know-about-fair-play-on-chess-com. If you are not clear about the rules - ask.