White/black pill to be the world's best chess player or blue pill to be the world's fastest swimmer

A witch comes up to you with 2 pills telling you to pick one. Here is what happens when you pick the following.

White/black pill: You instantly become the world's best chess player. You know every single combination there is. We are talking 10 to the 40th power. (This is ruling out illegal moves) That's how many combinations we are talking. Not only that but you also know what move your opponent will make and when they will move. You can also read their minds while you guys are playing, of course if they are thinking in another language, you will hear it in English or your native language)

Blue pill: You instantly become the world's fastest swimmer. Your reflexes and reaction time will be unbeatable when it is time to start swimming. You will also beat your 2nd place opponent by 5 seconds to 10 seconds. That's how fast you become.

If you try to pick both, you will have a lifetime supply of migraines 24/7 that is incurable and you lose either both your arms or your legs.

Which do you choose and why?

There is no right or wrong answer here. Some people are more brains, some are more physical.