The board

Step 1

The chessboard has 64 squares, light and dark. It is set so that each player has a light square in the right-hand corner: light on the right.

Step 2

The columns are called files. They are named with letters, a to h, from White's left to White's right. This is the e-file.

Step 3

The rows are called ranks. They are numbered ⁠1 to ⁠8, counting from White's side. This is the fourth rank.

Step 4

So every square has a name: its file, then its rank. Where the e-file meets the fourth rank is the square e4.

Step 5

Tap the square d5.

Step 6

Now tap g2.

Step 7

Which corner square is the light one on White's right?

1. h1
2. a1
3. a8