a board game for two players who move their 16 pieces according to specific rules; the object is to checkmate the opponent's king | a recognized sequence of moves at the beginning of a game of chess |
| the act of opening something |
| becoming open or being made open |
| the first of a series of actions |
| a vacant or unobstructed space that is man-made |
| an entrance equipped with a hatch; especially a passageway between decks of a ship |
| an aperture or hole that opens into a bodily cavity |
| a possible alternative |
| the initial part of the introduction |
| the first performance (as of a theatrical production) |
| a ceremony accompanying the start of some enterprise |
| an open or empty space in or between things |
| opportunity especially for employment or promotion |