An Algorithm for Automatically Updating a Forsyth-Edwards Notation String Without an Array Board Representation

TL;DR

This paper introduces an algorithm that updates FEN strings directly after chess moves without using array-based board representations, enabling efficient integration with software lacking such modules.

Contribution

The novel algorithm updates FEN strings directly, eliminating the need for array conversions, suitable for software without array-based board representations.

Findings

Algorithm correctly updates FEN after various moves

Works without array-based board representations

Immediate export of updated FEN strings

Abstract

We present an algorithm that correctly updates the Forsyth-Edwards Notation (FEN) chessboard character string after any move is made without the need for an intermediary array representation of the board. In particular, this relates to software that have to do with chess, certain chess variants and possibly even similar board games with comparable position representation. Even when performance may be equal or inferior to using arrays, the algorithm still provides an accurate and viable alternative to accomplishing the same thing, or when there may be a need for additional or side processing in conjunction with arrays. Furthermore, the end result (i.e. an updated FEN string) is immediately ready for export to any other internal module or external program, unlike with an intermediary array which needs to be first converted into a FEN string for export purposes. The algorithm is especially useful when there are no existing array-based modules to represent a visual board as it can do without them entirely. We provide examples that demonstrate the correctness of the algorithm given a variety of positions involving castling, en passant and pawn promotion.