const xd = [
    [1, 1, 0, 1, 1, 0],
    [1, 1, 0, 1, 1, 0],
    [0, 0, 0, 1, 0, 0],
    [0, 1, 1, 0, 1, 1],
    [0, 1, 1, 0, 1, 1],
];
let suma = 0;

for (let i = 0; i < xd.length; i++) {
    for (let j = 0; j < xd[i].length; j++) {
        if (
            xd[i][j] === 1
            && xd[i + 1][j] === 1
            && xd[i][j + 1] === 1
            && xd[i + 1][j + 1] === 1
        ) {
            suma++;
            xd[i][j] = 0;
            xd[i + 1][j] = 0;
            xd[i][j + 1] = 0;
            xd[i + 1][j + 1] = 0;
        }
    }
}

console.log(suma);