I am unable to end the game when a win is detected in connect four on matlab

I have the 2 player game essentially finished, but once a win is detected, the win variable will not set equal to zero, ending the loop. However, MATLAB is still able to print out that a player has won.

% Board and chip images are loaded
load Connect
imshow([Board{1,:};Board{2,:};Board{3,:};Board{4,:};Board{5,:};Board{6,:}]);
row=zeros(1,7); % Counter of chips in row vector is created
connect=[0 0 0 0 0 0 0; 0 0 0 0 0 0 0; 0 0 0 0 0 0 0; 0 0 0 0 0 0 0; 0 0 0 0 0 0 0; 0 0 0 0 0 0 0] % Matrix of board 
win=1;
while win==1
% P1 input
fprintf('Player 1, select a column to place your chip in.\n')
x1 = input('Select a column 1-7:');
Board{6-row(x1),x1}=redchip;% Red chip appears in the board image
connect(6-row(x1),x1)=1; % 1 is placed in board matrix
row(x1)=row(x1)+1; % A chip is added to the row
 imshow([Board{1,:};Board{2,:};Board{3,:};Board{4,:};Board{5,:};Board{6,:}]);
 check1=connect==1 % Matrix is made of only player 1 inputs (1s)
 %check vertical win
 for y=1:7
     for x=1:3
         if check1(x,y)==1&check1(x+1,y)==1&check1(x+2,y)==1&check1(x+3,y)==1
             win==0
             fprintf('Player 1 wins!')
             break 
         end 
     end 
 end 
 %Check horizontal win
 for y=1:4
     for x=1:6
         if check1(x,y)==1&check1(x,y+1)==1&check1(x,y+2)==1&check1(x,y+3)==1
             win==0
             fprintf('Player 1 wins!')
             break
         end 
     end 
 end 
 %check diagonal win bottom left top right
 for y=1:4
     for x=1:3
         if check1(x,y)==1&check1(x+1,y+1)==1&check1(x+2,y+2)==1&check1(x+3,y+3)==1
             win==0
             fprintf('Player 1 wins!')
             break
         end 
     end 
 end 
 %check diagonal win bottom right top left
  for y=4:7
     for x=1:3
         if check1(x,y)==1&check1(x+1,y-1)==1&check1(x+2,y-2)==1&check1(x+3,y-3)==1
             win==0
             fprintf('Player 1 wins!')
             break
         end 
     end 
 end 
% P2 input
fprintf('Player 2, select a column to place your chip in.\n')
x2 = input('Select a column 1-7:');
Board{6-row(x2),x2}=blackchip;
connect(6-row(x2),x2)=2;
row(x2)=row(x2)+1;
imshow([Board{1,:};Board{2,:};Board{3,:};Board{4,:};Board{5,:};Board{6,:}]);
check2=connect==2;
% Check vertical win
 for y=1:7
     for x=1:3
         if check2(x,y)==1&check2(x+1,y)==1&check2(x+2,y)==1&check2(x+3,y)==1
             win==0
             fprintf('Player 2 wins!')
             break
         end 
     end 
 end 
% Check horizontal win
 for y=1:4
     for x=1:6
         if check2(x,y)==1&check2(x,y+1)==1&check2(x,y+2)==1&check2(x,y+3)==1
             win==0
             fprintf('Player 2 wins!')
             break
         end 
     end 
 end 
% Checking diagonal win bottom left top right
for y=1:4
     for x=1:3
         if check2(x,y)==1&check2(x+1,y+1)==1&check2(x+2,y+2)==1&check2(x+3,y+3)==1
             win==0
             fprintf('Player 2 wins!')
             break
         end 
     end 
end 
% Checking diagonal win bottom right top left
for y=4:7
     for x=1:3
         if check1(x,y)==1&check1(x+1,y-1)==1&check1(x+2,y-2)==1&check1(x+3,y-3)==1
             win==0
             fprintf('Player 2 wins!')
             break
         end 
     end 
 end 
end