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Effective Hand Strength ( EHS ) is a poker algorithm conceived by computer scientists Darse Billings , Denis Papp , Jonathan Schaeffer and Duane Szafron that has been published for the first time in a It has since then been considered as a reference in the realm of poker artificial intelligence and has been the basis of further research such as : Algorithm The algorithm is a numerical approach to quantify the strength of a poker hand where its result expresses the strength of a particular hand in percentile ( i.e. ranging from 0 to 1 ) , compared to all other possible hands .
 Jonathan Schaeffer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jonathan Schaeffer