Need help settling a debate for 3 player chess. Is black checkmated?checkmate? (comments for context) : r/chess

The Project Gutenberg eBook of Chess Strategy, by Edward Lasker

Need help settling a debate for 3 player chess. Is black checkmated? checkmate? (comments for context) : r/chess

If an opponent has placed a chess piece on a square and has not yet pressed the clock, can he move that piece to another square? - Quora

Chess In Science Mags

Chess Jottings by Edward Winter

Three Player Chess Variants

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Shogi Dr Eric Silverman

Three Player Chess Variants

Kasparov's Fighting Chess 1993-1998, PDF, World Chess Championships

Why is the final move after checkmate not played? - Quora

Stepping-stones of Chess

Stepping-stones of Chess