Single Comment

Gollon's book covers the following variants in separate chapters:

Two-handed and four-handed Chaturanga;
Shatranj;
Oblong Chess;
Round or Byzantine Chess;
Shatranj Kamil (Perfect or Complete Chess) in two forms;
Shatranj al-Husun (Citadel Chess);
Timur's Chess;
other forms of Great Chess;
Courier Chess;
Chinese, Korean, Japanese, 'intermediate Japanese', Malay, Burmese, and
Thai chess;
San-Kwo-Chi;
Double Chess;
Jetan, or Martian Chess;
Chancellor Chess;
Capablanca's Chess;
Kriegspiel;
Nieuchess (an Avalon Hill game); and
Three-dimensional chess.

Each chapter provides some background on the variant described and
includes a sample game or two, in addition to the piece descriptions and
rules.

In a final 'Odds and Ends' chapter, he covers variants playable on a
regular 8x8 board plus dice or extra knights.

There is also a short section on 'The Construction of Sets' as well.