Score the play "K WP" if the batter reaches first base on a wild pitch third strike. Wild pitches are considered the pitcher's fault.
Score the play "K PB" if the batter reaches first base on a passed ball third strike. Passed balls are considered the catcher's fault.
Score the play "K 2-3" if the third strike is uncaught, but the catcher throws the batter out at first base. The "2" signifies the catcher's numerical position in scoring, and the "3" represents the first baseman. If, by some chance, another player gets in on the putout, score the play with the appropriate positional numbers.
Score the play "K 2U" if the third strike is uncaught, and the catcher tags out the batter before he reaches first. The "U" represents unassisted, meaning the catcher made the putout himself.