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O

opening

The first moves of a chess game usually chosen from standart opening lines.

OTB

Abbreviation for over the board. A game is called over-the-board when the players meet face to face as opposed to online/internet or correspondence chess.

over-the-board chess

Over-the-board (OTB) chess games are played face to face in contrast to chess games played on the Internet or correspondence chess games.

RD Glossary by Run Digital