That would just be a strategy. Game theory is the study of how strategies fare against each other, hence its application in evolutionary biology and such.
Playing chess to improve math ability
How exactly does one play chess from a game theory perpective?
Chess engines are a direct practical result of mathematicians using the mathematics of game theory and chess to further develop the field of game theory and coincidentally other fields of mathematics.

For me, chess is much more intuitive. I'm also a high school student, but I'm more interested in visual art, literature, history and stuff like that. To me chess almost feels like an art - it's hard to explain why, but maybe it has to do with the fact that the best moves are often non-obvious ones, which makes chess somewhat creative like art. I'm also pretty good at math, but I don't think chess helps.

How exactly does one play chess from a game theory perpective?
Chess engines are a direct practical result of mathematicians using the mathematics of game theory and chess to further develop the field of game theory and coincidentally other fields of mathematics.
Chess engines are the result of the ability to numerically evaluate a chess position, given the rules of chess. A quick glance for scholarly articles involving game theory and chess doesn't throw up much, but I did come across this interesting little snippet: http://en.wikipedia.org/wiki/Parrondo%27s_paradox
http://books.google.com/books?hl=en&lr=&id=vBiLu70eSKUC&oi=fnd&pg=PR9&dq=Game+Theory+Chess+&ots=4laZFhOSa2&sig=Dxgc-GYyswUBosJ22kym00q5OfI#v=onepage&q=Game%20Theory%20Chess&f=false

Well, at this point it has to be mentioned that math is not something you just "learn", but instead an art in which you develop your own style, requiring imagination and creativity.
That being said ... back to topic ...
Sorry if I offended you. I did not mean to simplify Math into something you just learn. (I find myself shaking my head when the topic of Poker comes up as simply a game of chance :D). I was just trying to understand what the OP meant by being "better".

If you find difficulty learning math, you need a good math tutor or at least a study companion. Playing chess does not help.

Hmmm..."No, it doesn't help", just doesn't seem to be a convincing argument to me.
Since chess and math are associated, and since a chess problem can be seen as a math problem, then I don't see how solving a math problem cannot help your math skills? Unless chess problems cannot be seen as math problems?

Assuming that playing chess does improve your math ability, there's also the issue of whether it will improve your grades in math.

people who play chess are mostly good in maths or we can say that who solves maths better can only play chess nicely
It is my opinion

The only connection I can see is problem-solving. But who's to say that problem-solving is such a singularly defined entity? Is there really such a faculty in each of us that means our ability to solve a problem improves by solving a completely different class of problem? I think not. The fact is you are not performing anything that can remotely be called maths when you play chess, and vice versa. You do not improve a skill except by practising it.
Countering a likely objection - if you think playing chess is maths because it can be described mathematically, then absolutely anything we do should be improving our maths ability. Don't get too hung up on the use of the word 'calculation' in chess.

I am a student in high school and I aim to become an engineer, however math is quite hard. I'm fairly certain I can handle the math, but if I improved my mathematical ability then it would make things much easier. A friend of mine told me that playing chess once a day could make you better at math.
I don't know if this is true or not. That's why I decided to ask the experts. Could playing chess improve my mathematical ability?
I study a lot during my spare time so it's not worth saying "You should focus on your studies instead". I'm simply asking whether chess could help me or not.
"If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is." John Louis von Neumann
As a math student and recreational chess player, benefit of playing chess is the ability to focus one's thoughts in order to achieve some goal. It is the ability to comprehend possible outcomes, and to understand consequences of one's actions. It will help you with mathematics for sure, but not more then it would help you with any other field of study, or other kinds of brain exercises for that matter.
You call mathematics hard but it is not. Do not train cracking hard problems, train accepting easy solutions. You see, there is inborn arrogance of ego, it cannot accept that trivial matters are giving you trouble, so it will rather convince you that those trivialities are problems that are important instead of just accepting the fact that it is inadequate. True problem solving is seeing simplicity, not praising oneself for solving exercises that were designed to put you on straith line of thinking and to prevent as much deviation from that as possible. Those are not the problems to be solved, those are things to avoid for ones sake.
You want to know maths? Don't do exercises you are given the way you are supposed to, develop new aproaches to what you know already and further your knowledge by trying new things that you come up with. Just like in chess, there are many ways to achieve goals in mathematics. Bur rarely will other peoples solutions do you any benefit other then making hard disk of your brain.

people who play chess are mostly good in maths or we can say that who solves maths better can only play chess nicely
It is my opinion
It's good for you to have opinion (well not really, as all philosophys suggest, it is a downfall) but why would you share it? How does it benefit anyone except you? You are misleading boy/girl here that seeks for an advice. Just to get a feeling of importance...

Chess help w/ your math ? no. Though i do feel a math backround can help your chess game,as would being good at board games.

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A field of mathematics, game theory, is directly related to chess. Studying and playing chess from a game theory perspective will help you with mathematics if the field of game theory is a perspective that you understand. As you probably know all fields of mathematics are related to each other. Mathematicians specialize in fields whose perspective of mathematics as a whole they understand.
yes , you are right , exactly very true , playing chess needs thinking ability same like solving math problems thinking ability but playing and practicing chess games lead to experience in playing chess not in math while solving math problems lead to be expert in math not in chess , from my experience as repair engineer i can say that both playing chess and solving math problems lead to the experience in solving problems in general and repairing and maintenance experience as a special work
How exactly does one play chess from a game theory perpective?
Steinitz's Laws for instance.
http://exeterchessclub.org.uk/content/theory-steinitz