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This item is a game information page
It belongs to categories: Orthodox chess, 
It was last modified on: 2000-10-23
 By David  Paulowich. Unicorn Chess. 10x10 variant with a new piece that moves as a Bishop or a Nightrider. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
Michael Nelson wrote on 2004-07-30 UTC
Ralph Betza's work suggests doing mobility conditions based on about 60% of initial piece density. This is 30% for FIDE Chess and 26.4% for Unicorn Chess. If Ralph is correct and this is the best value for overall mobility ratings, the Unicorn is measurablly stronger than the Queen with respect to mobility, as break even occurs at 22% piece density. One overlooked Queen advantage that tends to even out the non-mobility evaluation factors: The Queen has the King Interdiction ability and the Unicorn lacks it. King Interdiction refers to the ability of a Rook (or any piece having a Rook's move) to confine the enemy King to a certain section of the board by attacking the entire length of a rank or file so that the King cannot cross it.