reversi of 6by6

I will explain the rules of reversi.

There is an 6x6 square version.

Two white and two black stones are placed in the center.

If you are sandwiched between stones of different colors,
the stones will turn over.

For example, if both ends of Shiroishi are sandwiched between black,
it becomes black.

Even if multiple white stones are lined up,
if both ends are sandwiched between black stones,
the white stones will turn over and become black stones.

If Hasame both ends in vertical,
horizontal, and diagonal any direction, you can turn over a stone.

The same is true when black stone is sandwiched between white stones.

When all the squares are filled, the game is over

Winning or losing is decided by the number of stones at the end.