Semi-ghost stations occupy a controversial position in the game. Unlike full ghost stations, their status has never been expressly clarified, and many rulesets simply omit them altogether. Where declared in a game, they can lead to instability (particularly in rulesets with five quadrants or prior to Holland Park 2000) and often resolve into a particularly tight Dollis Hill. Semi-ghosts also share the unusual feature that a winning move is impossible directly from one.
[Wy]