Benutzer:Der-Wir-Ing/Rook and bishop versus rook endgame
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The rook and bishop versus rook endgame is a chess endgame where one player has just a rook, bishop and king, and the other player has only a rook and king. It has been studied many times through the years. This combination of Vorlage:Chessgloss is one of the most common pawnless chess endgames. It is generally a theoretical draw, but the rook and bishop have good winning chances in practice because the defense is difficult. Ulf Andersson won the position twice within a year, once against a grandmaster and once against a candidate master; and grandmaster Keith Arkell has won it 18 times out of 18 Vorlage:Harvcol.[1] In positions that have a forced win, up to 59 moves are required Vorlage:Harvcol. Tony Kosten has seen the endgame many times in master games, with the stronger side almost always winning Vorlage:Harvcol. Pal Benko called this the "headache ending" Vorlage:Harvcol.
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Being a five-piece endgame, the rook and bishop versus rook endgame has been fully analysed using computers. Endgame tablebases show that 40.1% of the legal positions with this material are theoretical wins, but that includes many unnatural positions that are unlikely to occur in games. Edmar Mednis estimated that less than 4% of starting positions that occur in games are theoretical wins Vorlage:Harvcol. Vorlage:AN chess