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external image Swiss_yodelers.jpg

Charly, ("Chess heuristics and algorithms for relaxing lazy yodelers")
an early chess program developed in 1967/68 by Gerald Tripard, Gerhard Rudolf and Werner Joho at ETH Zurich, to run on a CDC 1604.
New Glarus yodelers in traditional Swiss garb [1]

Description

The main tree search went 4 plies deep, with the final position including an extensive evaluation of all possible exchanges on the square occupied by the piece being moved there on the last ply. This made the program relatively strong tactically but there was not much in the program incorporating strategy. Strategy, besides material advantage, included mobility of the pieces, pawn structure and advancement to queening. It required a considerable amount of time making the program totally move-legal, such as incorporating all of the rules associated with castling, en passant, and stalemate through move repetition. The only thing not included was pawn promotion to something other than a queen. The opening book was programmed by Gerhard Rudolf, the machine language expert, the chess playing algorithm was programmed in Fortran. The library entries were collected from books, mainly, the 10th edition of Larry Evans, Modern Chess Openings [2].

ETH-MIT Match

In 1968, Gerald Tripard asked Richard Greenblatt for a match versus Mac Hack VI. Three games were played in October and November 1968 via ham radio [3]:

Game 1

[4] [5]
[Event "ETH-MIT Match"]
[Site "Zurich/Cambridge"]
[Date "1968.10.27"]
[Round "1"]
[White "Charly"]
[Black "Mac Hack VI"]
[Result "0-1"]
 
1.e4 e5 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 d5 5.Nxe5 Bd6 6.O-O O-O 7.c4 Bxe5 8.dxe5 Nc6
9.cxd5 Qxd5 10.Qf3 Bf5 11.Qxf5 Qxd3 12.Nc3 Nc5 13.Qxd3 Nxd3 14.f4 Rfd8 15.Rf3 Rd7
16.Ne4 Rad8 17.b3 R7d4 18.Nc3 Ne1 19.Rg3 Nc2 20.Rb1 Kf8 21.Nb5 R4d1+ 22.Kf2 R8d7
23.Ke2 R1d5 24.a4 N6d4+ 25.Nxd4 Nxd4+ 26.Kf2 Nf5 27.Ba3+ c5 28.Rc3 R5d2+ 29.Kg1 b6
30.g4 Nd4 31.Kh1 Nc2 32.Bc1 Re2 33.Bb2 Ne3 34.h3 Rd1+ 35.Rxd1 Nxd1 36.Ba1 Nxc3
37.Bxc3 Rc2 38.Be1 Rc1 39.g5 Rxe1+ 40.Kg2 Re4 41.b4 cxb4 0-1

Games 2 and 3

[6]
[Event "ETH-MIT Match"]
[Site "Zurich/Cambridge"]
[Date "1968.11.26"]
[Round "2"]
[White "Mac Hack VI"]
[Black "Charly"]
[Result "1-0"]
 
1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.d4 exd4 5.Nxd4 Nge7 6.Nc3 a6 7.Ba4 b5 8.Bb3 Na5
9.Qf3 Nxb3 10.axb3 c5 11.Ndxb5 d5 12.Nxd5 Nxd5 13.exd5 Qe7+ 14.Qe3 Qxe3+ 15.Bxe3 Kd7
16.Nc3 Bd6 17.Na4 Rb8 18.Nxc5+ Bxc5 19.Bxc5 Re8+ 20.Be3 Kd6 21.O-O-O Rb5 22.Bf4+ 1-0
 
[Event "ETH-MIT Match"]
[Site "Zurich/Cambridge"]
[Date "1968.11.26"]
[Round "3"]
[White "Charly"]
[Black "Mac Hack VI"]
[Result "0-1"]
 
1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Bc5 5.Nxe5 Qe7 6.Nxc6 dxc6 7.Bc4 Bg4 8.Be2
Bxe2 9.Qxe2 Nxe4 10.d3 Nd6 11.Qxe7+ Kxe7 12.Re1+ Kd7 13.c3 Rae8 14.Rd1 Re2 15.d4 Bb6
16.g4 Rhe8 17.Kg2 f5 18.g5 Nc4 19.b3 Ne3+ 20.Bxe3 R8xe3 21.g6 hxg6 22.d5 R3e4
23.dxc6+ Kxc6 24.Rf1 Rc2 25.a4 Ree2 26.Rd1 Rexf2+  0-1

See also


External Links


References

  1. ^ Outdoor group portrait of a group of Swiss yodelers in costume, 1922, Moen Photo Service, La Crosse, WI, Yodeling from Wikipedia
  2. ^ Description taken from July 1, 2010 letter from Dr. Gerald Tripard, hosted by Lawrence J. Krakauer
  3. ^ Computer chess via ham radio by Lawrence J. Krakauer
  4. ^ The first inter-computer chess game via ham radio by Lawrence J. Krakauer
  5. ^ October 30, 1968 letter from Richard Greenblatt to G. Tripard
  6. ^ Games 2 and 3

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