Revise the "Mill" Rule Implementation in the Twelve Men's Morris Game

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In the current implementation of the Twelve Men's Morris game, there appears to be an inconsistency with the official rules regarding the formation of a "mill" during the placement phase.

According to the standard rules, when a player forms a "mill" (also known as "dooz") by placing three pieces in a straight line during the placement phase, the opponent is not allowed to place a new piece on the board in that turn. Instead, the opponent must remove one of their own pieces from the board.

However, in the present implementation, it seems that the player who forms the "mill" gets to choose which of the opponent's pieces to remove, rather than the opponent making that decision themselves.

To ensure a more authentic and rule-compliant gaming experience, we suggest the following change:

When a player forms a "mill" during the placement phase, the opponent should be prompted to select and remove one of their own pieces from the board, instead of the "mill"-forming player making that choice for them.

This adjustment will bring the game in line with the widely accepted rules of Twelve Men's Morris and provide a fairer, more engaging experience for players.

Please consider implementing this change in the next update to enhance the game's adherence to the official rules and improve the overall user experience.