JavaScript chess

[Alessandro Scotti]

An interesting page with engines written in JavaScript:1

http://p4wn.sourceforge.net/

Apparently there's something in less than 3K of code, which includes the user interface!

[hgm]

A close competitor for micro-Max as far as size is concerned. I knew about the 5K contest, but this one is even significantly smaller.

In terms of speed JavaScript can probably not compete with C, though.

Btw, uMax had a nice win today in Open War, against HoiChess. I guess version 4.8 has really reached the state of a quite balanced engine, without any obvious blind spots that can be exploited for an easy victory.

[Event "OpenWar 2nd Edition"]
[Site "DELL-E6600"]
[Date "2007.06.01"]
[Round "55.11"]
[White "Micro-Max 4.8"]
[Black "HoiChess 0.9.0"]
[Result "1-0"]
[TimeControl "2700+5"]
[Annotator "1. +0.10 2... +0.08"]
[Number "1793"]

1. Nc3 {+0.10/10} d5 2. Nf3 {+0.05/11} d4 {+0.08/12} 3. Ne4 {-0.12/11}
Nc6 {+0.13/11} 4. e3 {-0.01/11} dxe3 {+0.18/11} 5. fxe3 {-0.08/12}
e5 {+0.20/10} 6. Bc4 {+0.05/11} Bf5 {+0.17/11} 7. Ng3 {+0.04/11}
Bg6 {+0.65/10} 8. O-O {+0.06/11} Bd6 {+0.23/10} 9. d4 {-0.14/10}
Nf6 {+0.02/10} 10. c3 {+0.06/11} Nd7 {+0.23/10} 11. Bd5 {+0.06/11}
exd4 {-0.09/10} 12. Nxd4 {+0.05/11} Nde5 {-0.19/10} 13. Ndf5 {+0.10/11}
Bf8 {-0.28/10} 14. Qb3 {+0.02/10} Na5 {+0.35/10} 15. Qa4+ {-0.13/12}
c6 {+0.28/10} 16. Rd1 {-0.14/12} Qc7 {+0.22/10} 17. Be4 {-0.18/11}
Nac4 {+0.23/9} 18. b3 {-0.01/10} Nb6 {+0.15/10} 19. Qa5 {+0.01/11}
Rc8 {+0.11/9} 20. c4 {+0.13/10} Qb8 {-0.02/9} 21. c5 {+0.35/12}
Nd5 {-0.67/11} 22. Bxd5 {+0.92/13} cxd5 {-1.15/11} 23. Rxd5 {+0.99/13}
Nd7 {-1.18/10} 24. Nd6+ {+0.95/12} Bxd6 {-1.17/12} 25. cxd6 {+1.11/12}
O-O {-1.16/10} 26. Bd2 {+1.41/11} Rc6 {-1.11/9} 27. Bb4 {+1.34/12}
Re8 {-1.07/10} 28. Re1 {+1.35/12} Rc2 {-1.05/9} 29. Nf5 {+1.53/13}
b6 {-0.88/10} 30. Qb5 {+1.55/12} Nf6 {-0.92/10} 31. Ne7+ {+1.74/11}
Kh8 {-0.96/11} 32. Rd4 {+1.55/12} Rxa2 {-0.87/10} 33. Nxg6+ {+2.05/12}
hxg6 {-0.90/10} 34. d7 {+2.18/13} Rd8 {-1.52/11} 35. Qc6 {+2.33/13}
b5 {-2.06/10} 36. Be7 {+2.42/13} Rxd7 {-2.95/11} 37. Bxf6 {+2.41/14}
Qb7 {-3.00/11} 38. Rh4+ {+2.39/15} Kg8 39. Qxb7 {+2.25/15} Rxb7 {-2.74/11}
40. Be5 {+2.23/14} Re7 {-2.65/10} 41. Rc1 {+2.18/13} Re8 {-2.38/10} 42.
Bd4 {+2.17/13} Ra3 {-2.36/10} 43. Rb1 {+2.20/13} a5 {-2.37/10} 44.
Rg4 {+2.23/13} a4 {-2.37/10} 45. Rg5 {+2.37/15} b4 {-3.97/11} 46.
bxa4 {+2.77/15} Rxa4 {-3.99/10} 47. Rb5 {+2.84/16} f6 {-4.03/10} 48.
R1xb4 {+2.96/15} Rxb4 {-4.04/11} 49. Rxb4 {+3.01/14} Kf7 {-4.09/11} 50.
h4 {+3.16/15} Ke6 {-4.09/10} 51. Kf2 {+3.18/15} Re7 {-4.11/10} 52.
g3 {+3.14/15} Rc7 {-4.12/10} 53. g4 {+3.17/15} Kd5 {-4.13/9} 54.
e4+ {+3.18/16} Ke6 {-4.13/10} 55. g5 {+3.17/17} fxg5 {-4.34/9} 56.
Rb6+ {+3.13/17} Kf7 {-4.70/11} 57. hxg5 {+3.10/18} Re7 {-4.83/11} 58.
Ke3 {+3.64/19} Ra7 {-4.84/11} 59. e5 {+4.10/18} Re7 {-4.90/10} 60.
Ke4 {+4.43/19} Re8 {-5.30/11} 61. Rd6 {+5.07/19} Re7 {-5.34/10} 62.
Kd5 {+6.39/20} Ke8 {-5.95/10} 63. e6 {+12.75/22} Rb7 {-6.70/12} 64.
Ra6 {+16.49/21} Rb8 {-7.20/11} 65. Bc5 {+16.50/15} Rd8+ {-13.45/12} 66.
Bd6 {+3.60/1} Rc8 {-999.90/10} 67. Ra7 {+4.19/2} Kd8 {-999.92/8} 68.
Rd7+ {+4.33/2} Ke8 69. Rf7 {+16.46/4} Rc5+ {-999.96/5} 70. Bxc5 {+8.03/2}
Kd8 71. Rxg7 Kc8 {-999.96/5} 72. Bd6 {+10.08/4} Kd8 73. Rg8# {+9.52/2}
{White mates} 1-0

[jshriver]

An interesting page with engines written in JavaScript:1

http://p4wn.sourceforge.net/

Apparently there's something in less than 3K of code, which includes the user interface!

Either this is pretty good or I really suck. Just played it and lost pretty fun though.

[Tony Thomas]

Code: Select all

 1. e2 e4   b8 c6
 2. b1 c3   g8 f6
 3. f2 f3   f6 e4
 4. c3 e4   d7 d5
 5. e4 c3   e7 e5
 6. f1 b5   c8 e6
 7. b5 c6   b7 c6
 8. g1 e2   f8 d6
 9. o-o     o-o  
10. d2 d4   e5 d4

 11. e2 d4   d6 h2
12. g1 h2   f7 f5
13. d4 e6   c6 c5
14. e6 d8   f8 d8
15. f1 e1   g7 g5
16. e1 e5   g5 g4
17. e5 f5   g4 f3
18. f5 f3   a7 a6
19. f3 f5   d5 d4
20. c3 e2   h7 h6

 21. f5 c5   d4 d3
22. c2 d3   h6 h5
23. c5 c7   h5 h4
24. c7 c4   d8 d3
25. d1 d3   a8 e8
26. c4 h4   a6 a5
27. h4 g4   g8 h8
28. d3 d4   e8 e5
29. d4 e5   h8 h7
30. e5 h5
 

I think you are bad Joshua.