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the cause for your problem is explained above (no need to keep multiple issues open about the same problem)
Fixed
the validMovement method was unnecessary. I was thinking if the knight is in (8,A), the method return false. And the knight cannot never win the game. while it is not correct.
Thats nice you find it out and you are welcome.
Thanks for the time you spend on this kata.
In
hasValidMovementmethod, what is the purpouse of this piece code:why it should return False?