There are unfortunately not that many books focusing on 1P.
- Both Eddie Robin's a definitely must-reads, but you really need to slowly go through them several times as they are kind of dense to just read through. So buying them is way better as for instance borrowing them, but as stated, their prices are quite steep.
- I was somewhat disappointed by Koehler's book on 1P, mostly because his Science of Pocket Billiard was such great an eye-opener for me. I was probably expecting something of the same depth and caliber and found his 1P book to be a bit light instead. It's worth reading, but I think it can be considered more of a "getting started" book.
- Tom's book is a great read, with many useful concepts. Also, it is nicely completed by his YouTube videos. And even better, Tom is available for lessons, which makes the whole Wirth package really worth it. I spend a complete week with him last November (2019) and had a blast. I can only highly recommend him to any serious 1P student.
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- If you're like me and hardly ever in contact with 1P players in the flesh, you'll have to draw your experience where you can and Accu-Stats remains a great well of knowledge. There are several channels today that cover whole events or specific matches, very well filmed and all, but the commentary isn't always useful/educational.
If you buy matches from the Accu-Stats catalogue and favor those commentated by Billy Incardona, Grady Mathews and Dany DiLiberto (especially those three in my opinion) you really get more than "oh what a great shot!", which is quite useless in terms of educational purposes. What you get are debates on what shots and options make more sense in a given position and why (even if they don't always agree), and that I have found priceless over the years.