The position is

0, 0, 0, 0, 0, 0, 0
0, 0, 0, 0, 0, 0, 0
1, 0, 0, 0, 0, 2, 0
2, 0, 0, 0, 0, 2, 0
1, 1, 1, 0, 2, 1, 0
1, 2, 2, 0, 1, 2, 0
          Red can win in , 2, moves by putting its piece(1) in columns

                                      2, 4

                      We will only prove it for column, 2

         Red can win in , 2, moves by putting its piece(1) in column, 2

                              leading to position

0, 0, 0, 0, 0, 0, 0
0, 0, 0, 0, 0, 0, 0
1, 0, 0, 0, 0, 2, 0
2, 1, 0, 0, 0, 2, 0
1, 1, 1, 0, 2, 1, 0
1, 2, 2, 0, 1, 2, 0
            The reasonable moves for Black are to move in column, 4

               if Black moves in column, 4, then the position is

0, 0, 0, 0, 0, 0, 0
0, 0, 0, 0, 0, 0, 0
1, 0, 0, 0, 0, 2, 0
2, 1, 0, 0, 0, 2, 0
1, 1, 1, 0, 2, 1, 0
1, 2, 2, 2, 1, 2, 0
                 from which Red can win in, 1,  moves. Indeed

                        --------------------------------

                                The position is

0, 0, 0, 0, 0, 0, 0
0, 0, 0, 0, 0, 0, 0
1, 0, 0, 0, 0, 2, 0
2, 1, 0, 0, 0, 2, 0
1, 1, 1, 0, 2, 1, 0
1, 2, 2, 2, 1, 2, 0
         Red can win in , 1, moves by putting its piece(1) in column, 4

                              leading to position

0, 0, 0, 0, 0, 0, 0
0, 0, 0, 0, 0, 0, 0
1, 0, 0, 0, 0, 2, 0
2, 1, 0, 0, 0, 2, 0
1, 1, 1, 1, 2, 1, 0
1, 2, 2, 2, 1, 2, 0
                               Red obviously won!

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