For example, he uses the same strategy table for Double Bonus, regardless of whether it is 10/7 full-pay or 9/6 short-pay.

Marten's incorrect "BQE" chart recommends keeping a pair of J-A over a 4-card flush, even though the average expected value of a 4-card flush is 7.55, compared to only 7.28 by holding J-A. His strategy of J-A over a 4-card flush would only be correct in a 9/6 game, where the flush pays 6.

Given the number of casinos in Las Vegas and Reno that offer the 10/7 version of Double Bonus, you follow Marten's advice at your own peril.

I will focus my comments exclusively on Jacks or Better Video Poker content (my game of choice, and as far as I read, once I realized the shortcomings of the book. )

Mr. Jensen identifies play strategies based on the various payout amounts of machines, collapsing 12 possible payout schemes to 2 strategies (excluding the Not Recommended to play strategy.) After an hour of analysis, I concluded the two play strategies are identical -- the only differences that I found are that the same hand is given different descriptors between the two strategy charts (what is described as JQ, JK, QK and JA, QA, KA as 2 separate hands in one strategy is simply described as 2 High Cards in the other, each with the same play strategy), and that he omitted a possible hand in one of the strategies (he describes what to do with a 4 card Inside Straight with 3 or 4 high cards, but he neglects to offer advice for any other type of 4 card Inside Straight.) My conclusion -- if Mr. Jensen recommends a Jacks or Better machine at all, he really means to tell me to play them all the same.

He further advises taking his book to the casino with you to match payout schemes on the machines to the charts in his book, rather than taking the time to reduce the various play/no-play strategies to a simple list of questions. I was able to reduce 12 charts to 3 simple questions to determine if (using his approach) you should play a machine or pass on it.

Finding such puzzling omissions and inconsistencies in this book makes me question the fundamental validity of his numbers and his strategies. He may be absolutely right (I'm not going to bother to do the math to double-check his assertions,) but I am left with enough lingering doubt that I'll pass on his advice and buy a different book and see what it says.