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Carl E Wagner vs Greenblatt (Computer)
Winter Amateur Tournament (1967), Massachusetts
Hungarian Opening: Reversed Alekhine (A00)  ·  1-0



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Kibitzer's Corner
May-06-12  YoungEd: 52...qxf2+!!! Always check; it might be mate!
Premium Chessgames Member
  AylerKupp: I believe that 52…Qxf2+ is an example of what I call Type 1 Horizon Effect (because it was the first kind identified). Greenblatt sees that there is no way to prevent mate after 52…Ke7 53.h8=Q (if 52…Kg7 then 53.Qg8#). The “best” it can do to delay it was to give up its queen by either 52…Qxf2+ or 52…Qxg4+ so it does so even if it results in a substantial material disadvantage. But it pushes (perhaps, this was an old engine) the inevitable mate beyond its search horizon so it considers this the lesser of the two evils (severe material disadvantage vs. being mated).

What is interesting, and causes me to perhaps disregard my logic above, is that in Richard Greenblatt’s description of his program (, he has this to say about his Secondary search: “A feature called secondary search was recently introduced. This was done in an attempt to obtain improved search depth at low cost. By increasing the depth of the search one can prevent the program from walking into traps which would not be recognized with a search conducted up to the normal depth. Moreover, one can discourage the tendency of the program to make delaying moves which force inevitable losses to occur beyond its normal lookahead.”

Alas, he never indicates what this “normal” depth is. And this paper was presented in the Fall 1967 Joint Computer Conference while the game was played in the Winter 1967 Amateur Tournament, so presumably this secondary search feature was incorporated in the winter 1967 version of the program. If it was, then it clearly must have had a bug in it because the program behaved in the way that the secondary search feature was intended to prevent.

Premium Chessgames Member
  wwall: The Winter 1967 tournament was actually the Massachusetts Winter Amateur Championship played at the Young Men’s Christian Union (YMCU) in Boston, played from Jan 21-23, 1967. This game was played by Carl Wagner (2190) in the first round on Jan 21, 1967. (sources: https://chessprogramming.wikispaces..., Chess Life, Feb 1967, p, 23, Chess Review, Mar 1967, p. 68, Boston Globe, Jan 29, 1967 and The Lewiston Daily Sun, Jan 23, 1967.
Sep-01-19  Chesgambit: Greenblatt first match

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