Chess improves the three elements, the opening game is reliable, the middle game is calculated, and the endgame is relied on Chess improves the three elements, the opening game is reliable, the middle game is calculated, and the endgame is relied on Chess improves the three elements, the opening game is reliable, the middle game is calculated, and the endgame is relied on Chess improves the three elements, the opening game is reliable, the middle game is calculated, and the endgame is relied on