Finding:

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   Piatigorsky Cup

   The Piatigorsky Cup was a triennial series of double round-robin grandmaster chess tournaments held in the United States in the 1960s. Sponsored by the Piatigorsky Foundation, only two events were held.
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   Gregor Piatigorsky

   A second Piatigorsky Cup was held in Santa Monica in 1966, and was won by Boris Spassky.
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   Jacqueline Piatigorsky

   In 1963 at the Ambassador Hotel she staged the first Piatigorsky Cup in which Tigran Petrosian and Paul Keres tied for first place.
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   Bobby Fischer

   Fischer turned down an invitation to play in the 1963 Piatigorsky Cup tournament in Los Angeles, which had a world-class field.
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   List of strong chess tournaments

   1963 Los Angeles (Piatigorsky Cup) Keres, Petrosian
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   Touch-move rule

   Kashdan, Isaac, ed. (1968), Second Piatigorsky Cup, Dover (1977 reprint), ISBN 0-486-23572-6
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   Paul Keres

   Keres shared first with World Champion Tigran Petrosian at the very strong 1963 Piatigorsky Cup in Los Angeles with 8.5/14 (results from this period: http://www.chessmetrics.com, the Paul Keres player file).
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   Tigran Petrosian

   Petrosian shared first place with Paul Keres at the Piatigorsky Cup, Los Angeles 1963, his first tournament after winning the championship.
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   Opposite colored bishops endgame

   If Fischer had won this game, he would have tied with Boris Spassky for first place in the 1966 Piatigorsky Cup tournament.
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    My 60 Memorable Games

    At that point the collection ended at the Piatigorsky Cup in 1966.

Explore the following pages on Powerset:

• Piatigorsky Cup,
• Gregor Piatigorsky,
• Jacqueline Piatigorsky,
• Bobby Fischer,
• List of strong chess tournaments,
• Touch-move rule,
• Paul Keres,
• Tigran Petrosian,
• Opposite colored bishops endgame,
• My 60 Memorable Games