Piers Harper Books

Checkmate at Chess City

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Using the moves of individual chessmen, the reader helps the Black Pawns, Knights, Bishops, and Rooks move through a series of maze-like scenes to enter Chess City and free their King and Queen.

Starting chess

By Harriet Castor, Rebecca Treays

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Covers the basics of chess, including the layout of the board, the various pieces and how they move, exchanges, opening and closing moves, and chess notation, and also includes internet links.

Little Rabbit Soft to Touch S.

By Piers Harper

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.