4. No player can release his antagonist from checkmate by taking any of his pieces.
5. Any player may call attention to the fact that his partner’s queen is in check.
6. But his own being in check, he may not direct attention to that.
7. A king is not in check by any of his partner’s pieces.
8. A pawn-piece can only be taken by a piece of its own rank, or by king or queen.
9. A player putting his hand on a piece must play it. If he remove his hand, the move must be considered as completed.
10. Adversaries’ kings cannot stand next each other on adjoining squares.
11. Should a player play out of his turn, both his antagonists may play out of theirs, and they are allowed to ask each other which of them is desirous of moving first.
12. No piece may be removed from the board unless legally captured.
13. A pawn can only move one square at a time, and not two squares first move, as in Single Chess.