4.2. Stack to Stack Moves

• To test the initial versions I generated a 1000 test boards.
• I noticed some of them were not solvable.
• I played some of them manually, and noticed they were solvable using a move that I missed.
• The latter was a meta-move that placed a card on a parent card on the same stack
• By implementing it, all of my boards turned out to be solvable.