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a chess program written in Fortran [1] by Donald Miller running on IBM 370 [2] and IBM 3081 (1984) mainframes [3], playing the ACM 1974, ACM 1976, ACM 1977 (2½/4) and ACM 1984. Xenarbor was further involved in promoting MyChess by David Kittinger, which running on a Cromemco Z-2 with Z80 processor won a match from Xenarbor 4 at an event of the Santa Clara Chess Club in 1979 [4].
Alien Tree 3 [5]


The program's name combines Greek [6] and Latin [7] roots to mean "strange or alien tree", as explained by Miller to Boris Baczynskyj during ACM 1984 [8].

Selected Games

ACM 1977

ACM 1977, round 3, Black Knight - Xenarbor [9]
[Event "ACM 1977"]
[Site "Seattle USA"]
[Date "1977.10.16"]
[Round "3"]
[White "Black Knight"]
[Black "Xenarbor"]
[Result "0-1"]
1.e4 c5 2.Nf3 Nc6 3.Nc3 d6 4.d4 cxd4 5.Nxd4 Nxd4 6.Qxd4 Nf6 7.e5 dxe5 8.Qxe5 a6 
9.Be2 Qd6 10.Qxd6 exd6 11.Bg5 Be6 12.Bxf6 gxf6 13.Bf3 O-O-O 14.O-O-O Bh6+ 15.Kb1 
Bg7 16.Rd3 f5 17.Rhd1 Be5 18.Bd5 Bxd5 19.Nxd5 Bxh2 20.Rh3 Be5 21.f4 h5 22.fxe5 
dxe5 23.Rf3 f4 24.g3 fxg3 25.Rxg3 h4 26.Rg7 f5 27.Nb6+ Kb8 28.Rdd7 Rxd7 29.Nxd7+ 
Ka7 30.Nxe5 Re8 31.Nc6+ Ka8 32.Ne7 f4 33.Rg8 Rxg8 34.c4 Rg1+ 35.Kc2 f3 36.Nc8 Kb8 
37.Nb6 f2 38.Nd7+ Ka7 39.Ne5 f1=Q 40.Kc3 h3 41.c5 h2 42.a4 h1=Q 43.b4 Qa1+ 44.Kd3 
Qxe5 45.a5 Qhe4+ 46.Kd2 Q5d4# 0-1

ACM 1984

ACM 1984, round 2, Xenarbor - Merlin [10]
[Event "ACM 1984"]
[Site "San Francisco USA"]
[Date "1984.10.07"]
[Round "2"]
[White "Xenarbor"]
[Black "Merlin"]
[Result "0-1"]
1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 Nbd7 7.Nxc4 Qc7 8.g3 e5
9.dxe5 Nxe5 10.Bf4 Rd8 11.Qxd8+ Qxd8 12.Bxe5 Bc2 13.Bxf6 Qxf6 14.Ne3 Bb3 
15.Bh3 Bb4 16.Ned1 Bxd1 17.Rxd1 Bxc3+ 18.bxc3 Qxc3+ 19.Kf1 Qb4 20.Bd7+ Ke7 
21.Bf5 Qxa4 22.Kg2 Kf6 23.Bb1 Ke6 24.h4 a5 25.h5 Qg4 26.f3 Qc4 27.Kf2 b5 
28.e3 Qc3 29.h6 Qb2+ 30.Kg1 Qe2 31.hxg7 Qxd1+ 32.Kf2 Qd2+ 33.Kf1 Rg8 34.Rh6+ 
f6 35.Bf5+ Kxf5 36.e4+ Ke5 37.Rh5+ Kd4 38.e5 Ke3 39.Kg1 Qf2+ 0-1

External Links


  1. ^ The Fifteenth ACM Computer Chess Championship, San Francisco California, October 7-9, 1984, pdf from The Computer History Museum
  2. ^ Seattle, Washington, 1977 - The 8th N.A.C.C.C from Computer Chess - A Memorial to Brute Force by Louis Kessler
  3. ^ Danny Kopec, Monroe Newborn (1985). ACM's Fifteenth North American Computer Chess Championship. Communications of the ACM, Vol. 28, No. 7, reprinted in The Sixteenth ACM North American Computer Chess Championship, Denver Colorado, October 13-15, 1985, pdf from The Computer History Museum
  4. ^ Chess and Computers
  5. ^ Alien Tree - Art Works of Hikaru Wada, November 23, 2009
  6. ^ xen - Wiktionary
  7. ^ arbor Latin - Wiktionary
  8. ^ Boris Baczynskyj (1985). The 15th ACM NACCC Anatomized. ICCA Journal, Vol. 8, No. 3
  9. ^ NACCC 1970-1982 Game download CSVN site
  10. ^ NACCC 1984-1994 - Game download CSVN site

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