Without helper columns, enter this ARRAY formula in D2 and fill down and across as required:
...confirmed by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL+SHIFT+ENTER you will get an error or a clearly incorrect answer. Press F2 on that cell and try again.
The key to this formula is matching the months in column B with the column headers. They must match in order for the formula to work. The ranges listed are to accommodate the 30 teams in the NHL.
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