began writing player class and wrote code to check if they're in check. should work but will need to test
fixed errors in isChecked method, should work but needs to be tested
added case for null in isChecked method
isChecked now returns false if they're not checked, was stuck at true
wrote some pseudo code for half of checkmate, not sure if it will work
rewrote some pseudocode in half of checkmate
finished writing pseudo code for checkmate, needs to be tested, I'm sure it has errors
added silvio's code for new game
wrote comments for pseudocode for checkmate