engine bug

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MarkmitK

After watching the first video on Q v R endings I wanted to practise against chess.com's engine (2000+) to mate from the Philidor position (white to move). However it happens always the following.

1. Qe5+ Ka8 2. Qa1+ Kb8 3. Qa5  and the engine moves the Rook to h7 and declares a draw.

Maybe somebody can fix this?