Chess (International Chess) is a classic two-player abstract strategy game with a history of nearly 2,000 years. Centered on "pure intellectual competition", it perfectly combines rigorous rules with tactical flexibility, becoming a globally popular mind sport that transcends age and region. Played on an 8×8 alternating black-and-white chessboard, each player controls 16 pieces (1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns). White moves first, followed by Black, with a clear core objective: using the unique movement rules of each piece (e.g., rooks move horizontally/vertically, knights jump in an L-shape, pawns advance and promote) and tactics like positioning, pinning, exchanging pieces, and discovered attacks, gradually restrict the opponent's space. The game is won by achieving "checkmate" — a situation where the enemy king is under constant attack with no legal moves to escape. Additionally, the game can end in a draw, resignation, or other ways. The core highlight of Chess lies in its "deep strategic depth": there is no element of chance, relying entirely on the player's logical reasoning, situation prediction, and mental warfare abilities. In the opening phase, players must seize central squares and develop pieces quickly to build defenses; the middle game requires identifying the opponent's weaknesses, creating attack opportunities through piece coordination, and guarding against hidden traps; the endgame tests precise calculation to achieve checkmate or force a draw with limited pieces. Each piece complements others while having its own limitations: the queen is the most powerful but must be deployed cautiously, pawns seem weak but can promote to stronger pieces for a comeback, and knights can leap over obstacles to become surprise attack weapons. This balance makes every game infinitely variable — a single move change can alter the entire outcome. The rules are easy to learn, with core movements masterable in half an hour, but mastering the game takes a lifetime. The difficulty progresses naturally, from beginner-friendly AI matches to high-level competitive games against masters. Chess offers high flexibility in gameplay: it supports offline board matches, online battles (including blitz, bullet, and other modes), and single-player AI practice versions to meet different needs. The classic and simple design of the chessboard and pieces, with distinct black-and-white contrast, requires no complex equipment, allowing games to be played anytime, anywhere. As a traditional item included in the "Seven Liberal Arts" of knightly education, Chess not only exercises logical thinking, concentration, and decision-making skills but also conveys strategic wisdom and sportsmanship. Whether for children's intellectual enlightenment, teenagers' thinking improvement, adults' casual competition, or professional players' competitive matches, this timeless mind game lets you experience the dual pleasure of mental challenge and a sense of achievement in every match!