Typo in: "Model-Free Prediction & Control with Monte Carlo (MC)" section -> "Blackjack Playground.ipynb" file:

[Almujtaba-Yaseen]

In the third line of the "strategy" function:

def strategy(observation):
score, dealer_score, usable_ace = observation
# Stick (action 0) if the score is > 20, hit (action 1) otherwise
return 0 if score >= 20 else 1

"> 20" should be ">= 20"

Also, the same typo in the "sample_policy" function, in the "MC Prediction.ipynb" file.

Thank you for your hard work!