March 2016
Problem of the Month

Tic-Tac-Logic

Tic-Tac-Logic is a single player puzzle based on tic-tac-toe.

The puzzle consists of a grid containing X's and O's in various places.

The object is to place X or O in the remaining squares so that:

1. There are no more than two consecutive X's or O's in a row or column;
2. the number of X's is the same as the number of O's in each row and column; and
3. all rows are unique and all columns are unique.

Click here for a printer version of this puzzle

Solution to the Problem:

James Alarie sent in six other solutions:

x x O O x O x x O O
O x O x O O x O x x
x O x x O x O x O O
x O x O x x O O x O
O x O O x O x O x x
O O x x O O x x O x
x O O x O x O x x O
O x x O x O x O O x
x O x O x x O x O O
O x O x O x O O x x

x x O O x O x x O O
O O x x O O x O x x
x O x x O x O x O O
x x O O x x O O x O
O x O O x O x O x x
O O x x O O x x O x
x O O x O x O x x O
O x x O x O x O O x
x O x O x x O x O O
O x O x O x O O x x

x O x O x O x x O O
O x O x O O x O x x
x O x x O x O x O O
x x O O x x O O x O
O x O O x O x O x x
O O x x O O x x O x
x O O x O x O x x O
O x x O x O x O O x
x O x O x x O x O O
O x O x O x O O x x

x x O O x O x x O O
O x O x O O x O x x
x O x x O x O x O O
x O x O x x O O x O
O x O O x O x O x x
O O x x O O x x O x
x O O x O x O x x O
O x x O x O x O O x
x O x O x x O O x O
O x O x O x O x O x

x x O O x O x x O O
O O x x O O x O x x
x O x x O x O x O O
x x O O x x O O x O
O x O O x O x O x x
O O x x O O x x O x
x O O x O x O x x O
O x x O x O x O O x
x O x O x x O O x O
O x O x O x O x O x

x O x O x O x x O O
O x O x O O x O x x
x O x x O x O x O O
x x O O x x O O x O
O x O O x O x O x x
O O x x O O x x O x
x O O x O x O x x O
O x x O x O x O O x
x O x O x x O O x O
O x O x O x O x O x
						

Correctly solved by:

1. James Alarie (sent in 6 solutions)	Flint, Michigan
2. Sreeroopa Sankararaman	Singapore, Singapore
3. Braxton Fryer	Mountain View High School, Mountain View, Wyoming
4. Ignas Masuiliouis	Culver Academies, Culver, Indiana
5. Ella Surzynski	Culver Academies, Culver, Indiana
6. Jessica Hamblin	Mountain View High School, Mountain View, Wyoming
7. Shay Martin	Mountain View High School, Mountain View, Wyoming
8. Marco Morelli (sent in 2 solutions)	Fermo, Italy
9. Ashlee Rudy	Mountain View High School, Mountain View, Wyoming
10. Danilo Calcinaro	Istituto Tecnico Tecnologico (ITT) "Montani", Fermo, Italy
11. Federico Fragolette	Istituto Tecnico Tecnologico (ITT) "Montani", Fermo, Italy

Send any comments or questions to: David Pleacher