
@RoizMichael83 Black has to find a way of bringing his rook to the back rank. Ra4-g4-g8 spends 3 tempi and loses, while the immediate Rb5+ loses to Kc3 Rb8 Kc4 (shouldering!), so I assume it is Kd4 Kb3 Rb5+ Ka4 Rb8 Ka5 Kc5 where white can't make progress.
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