According to John Nunn's Secrets of Pawnless Endings, based on perfect tablebase analysis, Q v BB is generally a win, except for one type of fortress position. Unfortunately, he says that the winning method is too complicated to explain, and even if possible to do so would take a whole book! Typical positions with this material require over 50 moves to force the win.
King and Queen vs Two bishops and Kng
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Is the endgame theoretically drawn? I have tried playing against the computer, and I am not sure how to win that endgame. Could someone explain, please?