Convert Descriptive Notation to Algebraic Notation chesscode-golfstring Many old chess books use descriptive notation to notate squares on a chessboard, naming the file (column) of the square based on the starting piece positions of White or Black, depending on whose move it is. The ranks (rows) ...

Background I was working on a system where for convenience (not security) people could use four digit codes to identify themselves. I figured this is something that may actually be useful in many real cases, yet is well enough defined that it could make a nice challenge! Explanation of pin codes ...

Transform characters of your choice into "Hello, world!" codegolf Challenge: Write program or function, which takes character as input and outputs character. Also create list of 13 unique ASCII printable characters (32-126). When elements of this list are fed into the program one by one, then the...

Input program generating Fibonacci, output program generating Fibonacci code-golf fibonacci code-generation Challenge: You will have to write program, which outputs program, that outputs single Fibonacci number. You can also write two input strings - first is input to your program when it is firs...

All Possible Ties in Tic-Tac-Toe code-golf tic-tac-toe kolmogorov-complexity Your task is to output all possible ways to end a game with a tie (all rows, columns, and diagonals are completely filled and do not have 3 X's or 3 O's) in Tic-Tac-Toe (assuming X goes first): OXO XXO XOX OXX XOX OO...

pattern-matching sequence code-golf Find all matches for the digit pattern In an older challenge, you were tasked with finding numbers which, in base-ten, matched this specific digit pattern: (n)(x)(n+1)(x)(n+2)(x)(n+3) etc... Meaning any number between 4 and 18 digits long such that the digits ...