Those all seem good... I can't think of any more right now, sorry
Philosophical and Spiritual aspects of Chess

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http://www.chess.com/forum/view/general/chess-endgame-life-analogies
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https://www.chess.com/forum/view/general/life-is-a-game-chess-is-life
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https://www.chess.com/forum/view/general/chess-and-life4
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http://www.chess.com/forum/view/general/how-to-progress-in-chess-and-life
I have many ideas not mentioned in the above links, but it's a huge topic, big enough for an entire book, literally.

Chess is full of them. These might be more or less what you were looking for, but I see a ton of life metaphors in chess.
People who are afraid to make necessary sacrifices (time, material goods, toxic relationships, etc) often end up losing far more instead.
The outcome of each game/effort is far less important than your approach to chess/life itself. Greatness is found in who you are and how you approach things, not in your accomplishments.
Many things in life and in chess look subtle or insignificant but are deceptively complex. Patience lets you take advantage of them, and little things multiply into big ones.
Balance is important. Being too aggressive will stretch you dangerously thin, and being too passive makes you miss all sorts of opportunities.
Go is a really good game for illustrating the butterfly effect.

Personally I always thought chess is not a good analogy for life mainly because whole chess is win/lose binary game , not considering draws, while life isn't. I do think that chess is a great metaphor for structured debate. In debate there is almost always a contest in which one or the other side wants to prove the other wrong, or self to be correct. Not sure what is philosophical about it.
Chess is is philosophically interesting as an abstraction and minimalized model of conflict. But what is particularly puzzling about it is mutual agreement to a set of rules, something that is still not universally agreed upon in real life. Yet in chess it is voluntary mutually and the reasons for it aren't that clear. Is it because equally applicable rules are some sort of an equalizer of both sides or is it because the rules allow for more freedom by limiting the opponent from doing something like turning the board upside down?
I'd say there is also a kind of evil mysticism in chess because it occupies the mind yet it is entirely inconsequential in real life.
Key, search-engine term: chess, metaphor = 429,000 results - Undoubtedly, a potentially distracting & constructive, 'time-killer'.. for Most 'navel watchers/ meditators.'
Re. 'chess, being inconsequential in Real Life {!?} .. N-O-T!! ..{imho} .. As, it improves/ teaches, the connection, between actions, and their consequences - {esp. if deliberately 'couched' in the 'Greater-scheme-of-things' primer/ lecture or book}.
Maybe, more so.. with those who give little thought, to that connection!

Richb8888, how about Nietzsches idea that will to power is the primary driver as opposed to the will to live.
Also, i.e. further, the fact that the will to power is defined by ones wanting to increase their sense of coordination within the world?
Maybe this is all games, but as a visual representation it stands possibly a little above Tetris does it not?

Re. 'chess, being inconsequential in Real Life {!?} .. N-O-T!! ..{imho} .. As, it improves/ teaches, the connection, between actions, and their consequences - {esp. if deliberately 'couched' in the 'Greater-scheme-of-things' primer/ lecture or book}.
Maybe, more so.. with those who give little thought, to that
Let me elaborate...
You forgot emotions(internal symbolization) a 3D world has 3 dimensional worlds! As does chess the only possible result of chess can be +/=/- as with all that exists! pH Scale, electricity right down to one's attitude!
Chess originally was a 3D board but the board was flattened to 2D to allow direct viewing from any one side! Evidence of this can be found by the 4 central squares being regarded with the highest value to control! They would be the top tier of a 3D board, 2nd tier is the 12 surrounding squares, then the 48 remaining squares that make up the outer edge! I could go to infinity and beyond on this subject! Mastery of chess requires mastery of self!

Here is something that I have always thought. One yhith is clear is that the pawns represent humans as we only see life in a straight line. Once we reach the end we can become the most powerful piece on the board.
https://www.astrologyweekly.com/astrology-articles/astrology-chess.php

Hi Drawgood, are you still out there?
My experience of being a grandfather this year has given me a new found reverence of the potentiality of the newborn. It occurred to me this morning that a pawn has a similar potentiality.

Richb8888, how about Nietzsches idea that will to power is the primary driver as opposed to the will to live.
Also, i.e. further, the fact that the will to power is defined by ones wanting to increase their sense of coordination within the world?
Maybe this is all games, but as a visual representation it stands possibly a little above Tetris does it not?
I know this post has been touched last almost a year ago but I just read some of the responses, so in case anyone gets a notification about this maybe you are reading this.
Although at the first glance it appears that Tetris is much simpler and less nuanced, representative?, of the real life (at least in the human society) I think it actually more accurately represents real life.
Its based on something I already mentioned previously. Chess has no element of chance, only illusion of chance from perception of precision or lack thereof of the opponents, and precision or lack thereof of one's thought process. Life is nothing like a full information game. It is a "game" with many subjectively attributed values of known, and of unknown, variables. Another way to phrase it is there are known unknowns, and the unknown unknowns.
Chess is a zero sum game in which the definition of the zero sum game is the same one that is used in mathematics and economics. I cite the definition from wikipedia, which normally isn't considered a source in itself, but I think we are just casually discussing something here; "a zero-sum game is a mathematical representation of a situation in which each participant's gain or loss of utility is exactly balanced by the losses or gains of the utility of the other participants. If the total gains of the participants are added up and the total losses are subtracted, they will sum to zero."
I want to not that I am not sure whether the draw and stalemate make chess something other than a zero sum game, but in any case the most common outcome is for one or the other player to win.
Anyway. Life, so far, hasn't revealed a precise purpose to humanity. It is also an unknown at this point. We can only observe that some people, and some groups of people, have picked a purpose as a sort of "victory condition", or claim to have discovered it.
So, because of the above very essential differences chess isn't a good representation of life. It isn't a good guide to life either. Ok, so you can subjectively claim that chess teaches people good habits. But I would argue that it isn't actually scientifically proven that chess has these positive effects on the players' minds. I actually think that at this point it is a myth when people claim that chess is something so beneficial to kids that schools should offer it everywhere. It is actually a very questionable suggestion. If we claim and choose to believe that chess plays a role in the formation of the human mind, then we have to also give equal consideration to the possibility that it has negative effects on players, and on kids in particular.
Here are just some hypothetical bad characteristics chess could be conditioning people for. Chess could be causing the players to perceive the world in a way that is too abstract as opposed to realistic since the game is an abstract. That could mean the players grow up to be less grounded in reality. Maybe it causes the players to confine their thoughts and ideas to a set of rules, and causes growing people to always expect rules in life, and even in spheres of life where there are no rigid rules, at least no rules founded in reality. Chess could be making the players less patient and irritable because they learn to be irritable when playing chess. Maybe it causes autism (lol) since chess at its core removes natural human interaction and replaces it with an abstract pieces and rules (lol).
Ok, I wrote too much. You get the idea.
Tetris on the other hand is closer to life in some sense. You know eventually you lose, if you view the game as one human life. Your skill determines with what score you finish. You do not know what piece will come after the next piece, so you have to account for more unpredictable eventualities, and that means sometimes you will inevitably make a bad move. It also tests your biological limits by increasing the game speed.
Does anyone think Chess can be used to represent or illustrate any concepts of philosophy or spiritual beliefs? I don't mean that the Bishop on the board represents religion or the kind is the head of the church. I mean in a more abstract way. For example chess being used to illustrate the limitations of the human mind and possibly human hubris. Determinism or non determinism. The butterfly effect.
Can you come up with any examples?