Created attachment 94276 [details] On Left (first) Kpatience reports game as no longer winnable as it would choose left Q-Hearts to play. By playing right Q-Hearts (right panel) game becomes winnable. The solver always plays cards from left to right. There are times when the best play is the rightmost playable card. So, playing the left card may lead to an unwinnable situation while playing the right card is winnable.
*** This bug has been marked as a duplicate of bug 290647 ***