Re: A different way of looking at pot odds.
The two situations are different. Once A bets 99, that money belongs to the pot, not to him. When B raises, A's only choices are fold or put in 1 chip. If he puts in the chip, he can win 200 chips. Unless he is more than 99.5% sure that he's lost, he should call.
If A checks and B puts in 100, then A's choice is to risk 100 chips to make 100 chips. Now he should bet with a 50% chance or better of winning.
Pot odds focus your attention on the essentials: what you have to put in, what you can win if you do, and what the probability of winning is. Who put the money in, when, where, why or how, are irrelevant.
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