Surprised to see this on the front page! I also posted this on r/chess where someone pointed out that Fischer played against Greenblatt in the 70s. I digged a l

Surprised to see this on the front page! I also posted this on r/chess where someone pointed out that Fischer played against Greenblatt in the 70s. I digged a little deeper and found out that Greenblatt chess program was also known as Mac Hack (https://www.chessprogramming.org/Mac_Hack https://www.chessprogramming.org/Mac_Hack). Fischer did play against Greenblatt in 1978. Tracy Miller and Robert Hyatt talk about this in a 1999 chess forum called rec.games.chess.computer (https://groups.google.com/g/rec.games.chess.computer/c/W5CUj2B77MY/m/J8mplRhRNbMJ https://groups.google.com/g/rec.games.chess.computer/c/W5CUj...): Miller writes: > Here is the game I have. At the time, Greenblatt was state of the art in chess computers, probably playing around expert strength. Bobby makes quick work of it. Note the nice knight sacrifice at move 10. 1. e4 e5 2. f4 exf4 3. Bc4 d5 4. Bxd5 Nf6 5. Nc3 Bb4 6. Nf3 0-0 7. 0-0 Nxd5 8. Nxd5 Bd6 9. d4 g5 10. Nxg5 Qxg5 11. e5 Bh3 12. Rf2 Bxe5 13. dxe5 c6 14. Bxf4 Qg7 15. Nf6+ Kh8 16. Qh5 Rd8 17. Qxh3 Na6 18. Rf3 Qg6 19. Rc1 Kg7 20. Rg3 Rh8 21. Qh6++ (1-0) To which Hyatt responds with: > Actually, mack hack was a 1500-level player. The first 'expert' program didn't show up until the late 1970's in the body of chess 4.x from Northwestern. Mack Hack dates to the late 60's and was highly selective. I used to have the source code for this thing many years ago (pdp 10 assembly language). It could search roughly 5 plies deep in tournament time controls, and typically searched 15 moves at ply=1/2, 9 moves at ply=3/4 and 7 at ply=5. Seems very selective, but the computers back then were very slow also. Here is the analysis of this game: https://lichess.org/study/QbZWFPLL/hrNBwilW https://lichess.org/study/QbZWFPLL/hrNBwilW