Which book to master Omaha H/L ?

[Lucky Clubs]

I found Cappelletti's book to be entertaining, but parts of it read a bit like a brag post. His hand examples are less about walking the reader through difficult decisions, and more about regaling the reader with hands where the board hit him square in the face and he scooped a big pot. It can be confusing because amid all the points about the importance of starting hand selection, you'll find anecdotes like "I was in late position with 2347 and figured I had the potential to hit a big flop, so I called the raise."

This is not a direct quote, and it's a bit of an extreme example, but his hand examples definitely skewed toward seeing a greater number of flops with marginal holdings, and adjusting postflop. Probably sound advice for a pro, but definitely not for a beginner looking to grasp the basics.

I got more out of Bill Boston's Omaha High-Low book, which is low on narrative, but excellent food for thought as you start to learn hand values. He used Wilson Turbo software to break down the win rate for every starting hand, and looking at the breakdowns was very informative. Between the obvious - AA23 double suited has the best winrate, 2222 has the lowest - there are many trap hands that look nice preflop but will lose often in a ring game. I would recommend checking it out... you could probably sift through it in just a couple hours at a Borders or Barnes & Noble.