A recent agadmator video pitted The Chessmaster (NES) against Stockfish 14 NNUE. What is more impressive to me is that this chess engine, released originally in 1986 and written by David Kittinger in 6502 assembly, was advertised at playing at 2000 Elo, on quite constrained hardware by today's standards. However, according to The Spacious Mind, it only plays at 1550-1600 Elo.
I am looking for calibrated Elo computer tournaments or personal experience with playing Chessmaster 2000 in gauging an accurate Elo rating. The Spacious Mind does not state how its Elo estimate for the software was derived, only that the site pitted various C64 engines against each other in a personal "2009 Commodore 64 Open Championship".