9va-形四96番勝負

Keishi is a game invented by Yamamoto Hotaru (the first Masakata Meijin) in junior high school in 1972. Later, in 1976, his friend Yamato Danjiro proposed a simplified version for PC gaming. This is the game we call "Keisi."

https://dnjiro.hatenablog.com/entry/keisi

■How to Play
Click the numbers below to display the Keishi board.

Move the black pieces (●) to create squares.

■1. Rules of Keishi
1. Alternately move one piece vertically, horizontally, or diagonally.
2. Create a square to win.
3. A piece previously moved cannot be returned to its original position.

■2. Moving Pieces
- Click the black piece (●) and then click the destination to move it.
- You can also move it by dragging.
- When you move the black piece (●), the PC (app) will move the white piece (〇).
- Continue until one player creates a square.

■3. Switching between first and second players
- Once you've created a square, click the "Switch" button.
- Switch first and second players and play again.
- Win two times to win the game.
- Click the game number to play as many times as you like.
- Click "-+" to play up to number 96.