The chess rating system is a method for calcualting the relative skill levels of competing chess players. The actual system is relatively complex mathematically speaking, but there are ways to gauge your rating through simple tests. These ratings are handy when playing computer chess games, as they give you a way to gauge the level of AI play.

Ivan IIIvan the Conqueror is a brand-new reincarnation of Excalibur?s popular chess-playing barbarian. Better than ever on the board, Ivan uses his 500-word vocabulary to insult and threaten you in deep, commanding tones. But he can also be a powerful and patient mentor. And now Ivan the Conqueror includes a full-size LCD in addition to his magnetic sensory board. Use the LCD to play without pieces or to confirm the position of the pieces on the big board. Are you up for the challenge? Enjoy the following features:100 Power Levels with an 1850 RatingSound Effects of Ancient Combat or mute the soundPlay with or without Pieces with Unique LCD500-word "Barbarian" Vocabulary!Batt. Req. 4 X "AA"Storage area for piecesSpecifications:Size: 10" x 12 1/4" x 1 3/8"Optional 6V adapter available

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Excalibur Game Timer II Digital Chess ClockMakes any game more exciting! Now play chess, checkers, backgammon, go, scrabble any board game?with the same excitement you?d find in tournaments! Two precision digital clocks, each with large 3/4", readable displays, keep split-second track of the time each opponent has used on his or her turn! Contrasting white button stems show you when it?s your move! Optional tone and red light signal when time has elapsed. Select from preset time controls or create your own. Easy to operate. It?s the only game timer officially endorsed by the US Chess Federation and the World Chess Hall of Fame! Specifications:Operates on 4 AA alkaline batteries. Full year warrantyBase size: 6 3/4 x 4 x 2 1/2 inches.

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Chess Station 2-in-1 Chess ComputerTwo Sets in One!Excalibur offers the newest breakthrough in computerized chess! You get a full-featured travel unit with an LCD that eliminates the bother of carrying pieces you can misplace. And when you?re at home, you can still play ?the old fashioned way.? Just plug the Chess Station into its docking station and use the included magnetic sensory board! Powerful processor plays at a tournament rating of 1750. Includes Excalibur?s famous teaching mode that takes an absolute beginner to advanced levels.Features:Select from 73 strength levels.Offers hint option for coaching.32 mate-training problems for advanced players.Optional teaching mode for beginners.Rates your games.Choose from selectable opening lines for play & practiceTake back mistakes.Specifications:Weight: 2 poundsRequires 3 AG13 Batteries (included)Board size: 7.5 by 7.5 inchesHandheld size: 5 by 2.5 inches

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