Stack-to-pot ratio (SPR)
The stack-to-pot ratio is the effective stack divided by the pot, and shows how much betting is left.
With 90 bb behind and 6 bb in the pot the SPR is 15. With 20 bb behind and 10 bb in the pot it is 2.
At a low SPR one pair is often strong enough to play for stacks. At a high SPR big pots are usually won by stronger hands, so one pair calls for more care.
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Practise decisions like this in the trainer: ten hands at a time, with the answer and the reason.