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Which Phrase of the game is the most important and Why?

For beginners, it's best to start with openings. Choose one, and master the different variations. If you can't get out of the opening with a decent position, then you won't have much of a chance. All three phases of the game are important, but the emphasis has to be on the opening.
@Grumpymantooth said in #21:
> For beginners, it's best to start with openings. Choose one, and master the different variations. If you can't get out of the opening with a decent position, then you won't have much of a chance. All three phases of the game are important, but the emphasis has to be on the opening.
Beginners usually try to checkmate early, or bring the queen out early to attack. But i will say - on higher level, from example advanced/expert level, the openings/openingschoices doesnt mean so much from that point. You can lose the game to the same player if you example play queens gambit, Boncloud, Caro-Kan, and so on. You can have studied this opening or mastering them well. But usually the game are decided because you losing to a better player or your'e play trough the game arent good enough in general with these factors: positional play, strategies, tactics, and plan...when it comes to all, it doesnt matter if you knows theory in the opening when your'e accuracy is about example 80% and your'e opponent have higher than that.
At higher level the game are decided in the middlegame/endgame part, because of these factors. If we playing example Ruy Lopez i dondt think there is a big deal if im taking your'e knight or not. So if there are no unrelevent moves with mistakes and blunders then there is no big deal for the game with the openingphase.
The real challenge are in my opinion the middlegame part.
In my opinion, middlegames are about setting up the perfect way to win, while endgames are conversions. So endgames are the most important, no matter how well you played before, if you don't know how to win the endgame, everything equals to zero.
The answer will be biased. It all depends on the time we have to complete a game. @A_Champ
Chess has scenic routes and mainlines. The mainlines are sharper. If time permits, the scenic routes are more fun.

The opening is about mobility & maneuverability.
The middle game about activity & schemes.
The end game about destiny & conceivable endings.

If you practice your end games, it will help to see the horizon.
The openings are the compass of the game.
The middle games is the traffic jams caused by the material remaining on the chessboard.
The end game is the final destination.

The most important thing about phases is to be prepared in all three of them.
lichess.org/insights/Toscani/acpl/phase
lichess.org/insights/Toscani/accuracy/phase

Phase _______/ acpl _/ accu / Total (Lower values is best)
Opening ____/ 56.19 / 74.9 / 131.09 (My opening accuracy logic, needs to improve.)
Middlegame / 89.28 / 58.3 / 147.58 ( My centipawn loss needs to improve.)
Endgame ___/ 60.33 / 67.8 / 128.13 ( It can wait until I improved my other phases)
Average ____/ 205.8 / 201.0 / 406.8 (Game values are affected by time controls)

Even with a middle game accuracy better than the other phases, I still need to improve the middle game centipawn losses the most. Cause and effect: The opening accuracy is weak, so it effects my middle games.

The most important phase is the one that the accuracy is best. Without that, you would have lost all your games.
But the absolute most important phase of the game, depends on your own weaknesses. Since my middle games are more accurate than my other phases it's the least important to me.

The most important phase that I need work on is the opening accuracy, than my end game accuracy. Accuracy first, centipawn loss second. More time may help to increase accuracy.
This is one of the better topic title spelling errors I've seen. Well done.
@Grumpymantooth said in #21:
> For beginners, it's best to start with openings. Choose one, and master the different variations. If you can't get out of the opening with a decent position, then you won't have much of a chance.

Most beginners tend to blunder a piece more than once each game so it does not make that much of a difference if their position is decent after the opening. Learning basic opening principles helps but it's not really where their games are going to be decided. Studying openings in the sense of specific lines and variants at this point seems quite premature to me.
Most 1700 rated players probably need work on the accuracy of their middle games.
I averaged out the BOT maia5 and maia9 insights to get the following numbers for a 1700 rating bot.
Phase / acpl / accuracy
Opening / 32.27 / 85.75%
Middlegame / 71.81 / 62.3%
Endgame / 54.65 / 68%

If my blitz acpl or accuracy are close to the above bot numbers, than my standings compared to my peers should probably be in the middle too. If only there was an averaged lichess human insight by rating. It would help us compare our skills to our peers.

The clock is the final phase. So it's the most important. Finish on time and win. If you let an engine play your moves, the move time vs time pressure might look like a bot.

lichess.org/insights/Toscani/movetime/clockPercent
My number of seconds per move:
≤3% time left / 2.22 seconds per move
3% to 10% time left / 3.5
10% to 25% time left / 5.23
25% to 50% time left / 6.16
≥50% time left / 4.45 (Poor time management. Playing like I was under time pressure)

Bot speed:
lichess.org/insights/maia1/movetime/clockPercent
lichess.org/insights/maia5/movetime/clockPercent
lichess.org/insights/maia9/movetime/clockPercent

Maia1 / Maia5 / Maia9 (seconds per move)
≤3% time left / 0.31 / 0.21 / 0.24
3% to 10% time left / 1.36 / 1.06 / 1.17
10% to 25% time left / 2.93 / 2.72 / 2.63
25% to 50% time left / 3.95 / 3.32 / 3.87
≥50% time left / 4.7 / 5.09 / 4.68

If we have more time, normal we should be using more time to improve the quality of the game.
If you exceed these average chess insight values, you're doing better than me or these bots !

So the most important phase is the one that eats up the most amount of time.
The harder it is to find a good move, the more important the phase is.
After a bad opening, there is hope for the middle game.
After a bad middle game, there is hope for the endgame.
But once you are in the endgame, the moment of truth has arrived.

~Edmar Mednis
Time is of essence: Wasting time makes us loss games.
Quality vs quantity: Playing the move is more important than the phase you're in.
The unfamiliar positions are most likely to happen in the middle games.

A phase needs to be measured by exchanges. It's the only constant. Measure a game by the streak of exchanges. If you had 30 exchanges you are left with only kings on the chessboard. So we can have max 30 exchanges. A game phase could be 10 exchanges per phase or be say 21 exchanges which would change the phase length to 7 exchanges per phase. The exchanges become a constant. You can win a game without exchanges, so you can win in the opening phase. That means the opening phase is the most important. The short games often miss a phase or two. So that too means the opening the most important phase. But for me, the most important phase of a game is the one that gives me most pleasure.

With enough time, the most important phase is having the time to play out the correct moves.
Adding up the amount of time spent thinking over each move, will determine the most important phase.

lichess.org/insights/maia9/movetime/piece/phase:1
lichess.org/insights/maia9/movetime/piece/phase:2
lichess.org/insights/maia9/movetime/piece/phase:3

Maia9 / Phase 1 / Phase 2 / Phase 3
Pawn / 1.77 / 5.14 / 5.17
Knight / 2.22 / 5.02 / 5.23
Bishop / 2.58 / 5.01 / 5.32
Rook / 3.97 / 5.29 / 5.15
Queen / 2.81 / 5.13 / 4.82
King / 3.04 / 6.31 / 5.6
Total Seconds / 16.39 / 31.9 / 31.29

So the most important for this bot was the middle game. It took the longest on average to play. But a close second is the end game.

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