Number the rows from 0 to 9 top to bottom and the columns 0 to 9 left to right. The top right space is 09. “X” means to eliminate a square; “T” means that it has been determined to have a tent. Slashes separates different rows and columns.

The first step is to eliminate any squares in a zero row or column. X 21, 22, 24, 25, 26, 27.

The second step is to eliminate any squares that are not horizontally or vertically adjacent to a tree. X 03, 06, 07, 08, 09, 12, 17, 32, 36, 43, 45, 49, 50, 54, 59, 68, 69, 70, 74, 78, 79, 83, 89, 90, 92, 98, 99.

The main work uses the pigeonhole principle. (For example, if there are four baskets and there is a ball each in three of them, it is impossible to select two baskets and not have at least one basket with a ball in it.) Often, further conclusions can be made.

Column 0: X 71

Row 0: X 11 / 3: X 44 / 5: X 42 / 7: X 66 / 9: X 82

Column 4: X 75 / 6: X 85 / 5: X 46 / 6: X 76

Row 3: X 48; T40; X 30, 31, 51; T 33, 35, 37, 39; X 38 / 5: T 38

Column 1: T 91; X 80; T 60 / 4: X 73 / 7: X 77, 97 / 8: T 18, 88; X 19

Row 6: X 64 / 7: T 72, 76 / 8: T 84; X 93 / 9: T 96

Column 4: T 04; X 05, 13 / 3: T 53; X 52 / 2: T 02

Row 0: X 00 / 1: T 10, 16

Column 5: T 55; X 56

There are tents in squares 02, 04, 10, 16, 18, 33, 35, 37, 39, 40, 53, 55, 58, 60, 72, 76, 84, 88, 91, and 96.