covering chess board with 3*1 dominoes
36805
Simple chessboard exercise
44852
How to make a resizable chess board?
100164
Tennis tournament proof that $n + 1$ players can form a line
35864
Playing with numbers form $1$ to $n^2$ in an $n\times n$ grid
52342
Partition rectangle into finite number of squares
4747
arrangement of $n$ oranges and $n$ apples around a circle
144636
Placing checkers on an m x n board
28645
Alice and Bob play the determinant game
125124
Random solving of a Rubik cube .
65372
Triangles defined on an infinite Go board by same-colored stones
5448
Finding the closure of some subsets of the ordered square
86397
throwing a $k$-sided dice until you get every face the same number of times
36230
Scoring when two triple word squares are covered in one play
84721
Probability combinatorics deck of cards
28843
Algorithm for finding the fewest rectangles to cover a set of rectangles without overlapping
72052
Combinatorics the number of options for $k$ different balls in n different cells, with at least $1$ ball in each cell
68882
Path to Combinatorics Problem [$1.11$]