# Introduction to PHATT planning approach

Learn the basics of PHATT planning approach and apply it to games.

## The problem in classical planning

Unfortunately, the problem of assigning each sequence to a strategy isn’t addressed by Ramírez and Geffner’s (2009) approach. To resolve this problem, Ramírez and Geffner (2010) proposed modifying their original approach using a probabilistic formulation of plan recognition that was still based on classical planning.

### Usage of probabilities

With this approach, they tried to find the probability of a goal given some observations, formulated as

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