The middlegame is BY FAR the most important phase

If i gain an advantage that I think I can convert, im heading to an endgame for sure.

As for all these stale quotes, meh. Sometimes these forums are like a Dice Clay comedy show - you know what's coming.

python3 readpgn9.py A3uMVGFm.pgn
Plies : 85 (43 moves)
White: development peaked at 6/8 after White's move 14 (ply 26), held until ply 34
Black: development peaked at 6/7 after Black's move 11 (ply 21)
Opening line : Black completed development after ply 21 (24.7% of the game) - the pure opening ends there
Transition : Black is already in its middlegame while White still finishes developing - ply 21 -> 26 (5.9% of the game)
Middlegame : both sides developed after ply 26 (30.6% of the game)
Endgame check: each side's own non-pawn material against 60% of its own start
White: fell below 60% (14 of 31 pts) after ply 57 (67.1% of the game)
Black: fell below 60% (12 of 28 pts) after ply 62 (72.9% of the game)
Transition : White has traded into its endgame while Black still holds middlegame material - ply 57 -> 62 (5.9% of the game)
Endgame line : the pure endgame begins after ply 62 (72.9% of the game)
Pure middlegame: ply 26 -> 57 (36.5% of the game wide)