2d Random march Markov'Chain

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Hi

problem of the robot that moves symmetrically with steps of 1 on a graduated network (table), starting from the origin can be interpreted as the problem of the ruin of the "two-dimensional" player,

I put the sageMath code to solve this problem on cocalc.com in order to share it. Maybe it can help SageMath beginners get started. However, I do not think my code is optimal ! Any constructive criticism will be welcome.

code on cocalc.com

a discussion on the subject