# validation for placing cards: - is the game still running - is it the players turn - does the card exist - does the player have that card in his deck - does the player have this card in his hand - is the type of card allowed in that type of field - is the field already blocked by another card # validation for attacking another player - is the game still running - is it the players turn - does the card exist - does the player have that card in his deck - is that card played - does the enemy have remaining monster cards on his side - if yes a direct attack would only be possible if a effect allows it - can this card attack - is the card of correct type - is it blocked by effects (will be implemented after card effects are implemented) # player death management (win condition) - does a players hp go to 0? - make the other player the winner - if an effect affects the playing player card priority comes first # handle a player leaving - check if game still runs - make remaining player win if yes # turn management - server keeps track of each turn - whos turn is it - what turn state is currently active - draw state - place state - is the player trying to do actions not allowed in the given state