For there this helps a little also in the explanation.
How do you determine SPR is good for every type of hand? Well, depending on how much is in the pot and how much left in the stacks, there is "room" for x betting the pot size. For example an SPR of 13 has room for 3 bets the pot size. In an NL100 game (assuming two players, both with $ 100 of stack), pe imagine that you raise to 3 BB. The button equals, so a pot of 7.5 dollars is formed; flop will have $ 97 of stack and a pot of 7.5; 97 / 7.5 = 12.9. If the flop bets the pot and your opponent calls, there will be a $ 22.5 pot on the turn, and you will be a $ 90 stack. Now on the turn you put the pot, $ 22. You are about $ 58, and has formed a pot of about $ 65. On the river, there is room for another bet in the pot. And do you have an SPR of 13 something special? For the authors of the book, is the SPR worst thing you can have with top pair. If leagues top pair with an SPR of 13, and you put two bets the pot size on the river you stay in a situation in which, to go all-in, you get great odds
of 2: 1. There are few to be committed to the pot, so whether you bet on the river like raisins and the opponent puts you all-in, you are facing a very difficult decision. You have very bad negative implicit in the river, because if you go past the opponent will check worse hands, and if bet is possible that mistake, both equaling as tirándote. How could you have prevented it? Of course, checking the turn is a possibility, but if there are draws on the board is not pretty. The best would have had a better SPR to play a hand like top pair. Both April 1 as a greater than 20 may be worth. If the SPR is worth about 4 (which means that there has been a sharp rise preflop), you'll stay engaged with top pair and the hand is played much easier, avoiding questionable situations. If, however, you have a SPR 20 (pots preflop small), you can go hand in hand when you enter without doubt so painful. Also, having larger stacks the boat on the river, opponents will not want to gamble with several winning hands for fear of a re-raise on your part (which is impossible, or very relevant, if there is so much money in the river stacks as in the pot).