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The last endgame riddle invited readers to take a look at a complicated endgame with opposite-coloured bishops that occurred in a game between Mikhail Botvinnik and Ludek Pachman, played at the Chess Olympiad 1960 in Leipzig.
Readers were asked to analyse the endgame with opposite-coloured bishops to find out whether Black was lost after the exchange of rooks or whether he could have saved the game.
Three solutions have reached me, and interestingly all three come to the same conclusion but are very different.
Charles Sullivan analysed the position in detail and Zoran Petronijevic fine-tuned these analyses and summed up the conclusions:
