[jeffnc]

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Really? Where have you ever seen SPR in print before?

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The concept of stack size compared to the current betting and pot size has always been around.

Pot-Limit and No-Limit Poker by Stewart Reuben and Bob Ciaffone

Chapter 5: How Deep are You?

"The amount of money in front of the players has a profound influence on the betting."

"The deeper the money, the greater the implication that a player has a strong hand when he raises."

After numerous examples:

"As we see, the amount of money in front of you and your opponent is often a critical factor in determining how to play and when to play."

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There is nothing there that refers to SPR in any way.

Besides, it's the description and discussion of SPR that's important, not the mere mention of a "pot" and a "stack".

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By the way, do you also refer to "pot odds" as a "technique"?

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Pot odds is not a technique but a specific way, or shortcut, used to measure them would be.

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There is nothing interesting in PNL related to shortcuts for measuring SPR. It's the concepts introduced that are important. The difference is like saying "there was a book that talked about the size of the pot and the size of the bet", versus a strategy quantifying pot odds and recommending how to use that quantification. Big difference.

Sorry, there has been nothing like PNL in print ever before. Props to the authors where props are due.