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␈↓ ↓H␈↓␈↓βS␈↓∧ Artificial Intelligence Laboratory, STANFORD UNIVERSITY, Stanford, California 94305
␈↓ ↓H␈↓∧Telephone 415 497-4430␈↓ 	TDecember 12, 1975




␈↓ ↓H␈↓Mr. S. Soule
␈↓ ↓H␈↓ University of Calgary
␈↓ ↓H␈↓ Calgary, Alberta, Canada

␈↓ ↓H␈↓Dear Mr. Soule:

␈↓ ↓H␈↓        Have␈α⊃you␈α⊃checked␈α⊃the␈α∩null␈α⊃hypothesis␈α⊃that␈α⊃X␈α⊃is␈α∩an␈α⊃ancient␈α⊃version␈α⊃of␈α∩the␈α⊃Greenblatt
␈↓ ↓H␈↓program that has been around on PDP-10s since 1967?


␈↓ ↓H␈↓Sincerely,



␈↓ ↓H␈↓John McCarthy
␈↓ ↓H␈↓Director
␈↓ ↓H␈↓Professor of Computer Science

␈↓ ↓H␈↓P.S.␈αIf␈αit␈αhas␈αcommands␈αlike␈αPW␈αfor␈αplay␈αwhite␈αand␈αBD␈αto␈αdisplay␈αthe␈αboard␈αthen␈αit␈αprobably␈αis
␈↓ ↓H␈↓Greenblatt's program which is so seasoned as to be downright moldy.