Move Notation in Connect Four

Move notation in Connect Four is refreshingly simple compared to chess. Because pieces always fall to the lowest empty square in the chosen column, you only need to record the column number for each move. A complete game can be encoded as a string of digits between 1 and 7. For example, the game "4 4 5 3 4 4 7" describes a sequence of seven moves. Player 1 plays column 4 first, player 2 responds with column 4, and so on alternating turns.

This simplicity makes Connect Four exceptionally easy to share and analyze. You can paste a move sequence into a text message and your friend can replay the entire game in their head or on a board. Online platforms like play4row store games in this notation and reconstruct the visual board state on demand. The notation also makes engine analysis efficient. The engine reads the move sequence, plays through it, and produces evaluations for each position.

Some advanced notations include extra information. Annotated game records might add symbols after each move to indicate move quality: "!" for excellent, "?" for mistake, "??" for blunder, "!!" for brilliant. These annotations come from the engine's post-game review. They help you study the game by drawing attention to the critical moments. Other notations include row coordinates as well as column coordinates, but this is redundant since gravity determines the row automatically.

Beyond move sequences, board diagrams are another notation form. A board diagram shows the final or intermediate position visually, often as a 7x6 grid of dots, X marks, and O marks. Diagrams are useful for puzzle composition and tactical study, where the focus is on a specific position rather than a full game history. play4row uses both notations: move sequences for game records and board diagrams for puzzle presentations. Knowing both formats lets you participate in any Connect Four community discussion.