chess = (n) => {

    console.log(`<div class="chessboard">`)
    for (let i = 0; i < n; i++) {
        console.log(`  <div>`);
        for (let k = 0; k < n; k++) {
            if (i % 2 === 0) {
                if (k % 2 === 0) {
                    console.log(`    <span class="black"></span>`);
                } else {
                    console.log(`    <span class="white"></span>`);
                }
            } else {
                if (k % 2 === 0) {
                    console.log(`    <span class="white"></span>`);
                } else {
                    console.log(`    <span class="black"></span>`);
                }
            }
        }
        console.log(`  </div>`)
    }
    console.log(`</div>`)
}