Lozza - a Javascript web based UCI engine - update v1.10

[op12no2]

Hi all,

Something a little different...

As well as gradually improving the engine, I've recently extended the online toys associated with it:-

Play Lozza online - http://op12no2.me/toys/lozza/play.htm - no time controls - she moves in the time you move...

Analyse/evaluate a FEN - http://op12no2.me/toys/lozza/fen.htm

UCI command line console - http://op12no2.me/toys/lozza/console.htm

Needs a modern browser because Lozza is fired up in a web worker. Google Chrome is by far the best for performance with their amazing V8 based Javascript.

As a UCI engine, Lozza can also be used in a traditional UIs like Winboard and Arena by using Edmund M's jsUCI tool and starting with jsuci.exe lozza.js. Both in same directory is best.

https://chessprogramming.wikispaces.com/JSUCI

[Ferdy]

I tried playing it with Deuterium android at 5s/move using pgn master, on my tab (around 1.2 Ghz), and observed that when I capture the pawn by ep, the captured pawn was not removed from the board, say white has e5 pawn and black played f7f5, then I played 10. e5xf6 (ep), the board was updated, with my white pawn in f6 and still a black pawn in f5. But after black's reply Nxf6 the pawn in f5 is now removed.
Also when I promote the pawn to queen, the gui does not allow it, or perhaps there is another method where I am not aware of. But pushing the pawn to 8th rank, the pawn will return back to 7th rank.

Here is the game.
[pgn]
[Event "online game"]
[Site "?"]
[Date "2014.??.??"]
[Round "1"]
[White "deuterium 14.3 android"]
[Black "lozza toys"]
[Result "1-0"]

1. Nf3 Nf6 2. d4 e6 3. e3 Be7 4. Bd3 O-O 5. O-O c5 6. dxc5 Bxc5 7. e4 d5 8. e5
Ne4 9. Qe1 f5 10. exf6 Nxf6 11. Bd2 Nc6 12. b4 Bd6 13. b5 Ne7 14. Bb4 a6 15. a3
axb5 16. Nc3 Bxb4 17. axb4 Rxa1 18. Qxa1 Nc6 19. Bxb5 Nxb4 20. Rb1 Na6 21. Bd3
Nc5 22. Qa3 Nxd3 23. cxd3 Nh5 24. Ne2 Qc7 25. Rc1 Qb8 26. Qe7 Nf6 27. Qc7 Qa7
28. Ne5 Nd7 29. Nf3 Qa6 30. Nf4 Qb6 31. g3 h6 32. Qxb6 Nxb6 33. Ne5 g5 34. Nfg6
Rd8 35. Rc7 Nd7 36. Nxd7 Bxd7 37. Rxb7 Be8 38. Ne5 Kf8 39. Kg2 h5 40. h3 Rd6 41.
d4 Ra6 42. g4 hxg4 43. hxg4 Rd6 44. Kg3 Rd8 45. Nf3 Bc6 46. Rh7 Rd7 47. Rh6 Rd6
48. Nxg5 Bd7 49. Rh7 Ke8 50. Nf7 Rb6 51. g5 Bc6 52. g6 Kf8 53. Kf4 Be8 54. Rh8+
Ke7 55. Ne5 Bxg6 56. Nxg6+ Kf6 57. Ne5 Rb4 58. Rh6+ Kg7 59. Nc6 Rxd4+ 60. Nxd4
Kxh6 61. Ke5 Kg5 62. f4+ Kg6 63. Kxe6 Kg7 64. f5 Kf8 65. f6 Kg8 66. Nf5 Kh7 67.
f7 Kg6 68. f8=Q {The toy does not allow promotion.} 1-0
[/pgn]

[stevenaaus]

no time controls - she moves in the time you move

Yeah , right. We'll all clean it up with those odds.

[op12no2]

I tried playing it with Deuterium android at 5s/move using pgn master, on my tab (around 1.2 Ghz), and observed that when I capture the pawn by ep, the captured pawn was not removed from the board, say white has e5 pawn and black played f7f5, then I played 10. e5xf6 (ep), the board was updated, with my white pawn in f6 and still a black pawn in f5. But after black's reply Nxf6 the pawn in f5 is now removed.
Also when I promote the pawn to queen, the gui does not allow it, or perhaps there is another method where I am not aware of. But pushing the pawn to 8th rank, the pawn will return back to 7th rank.

Thanks Ferdinand. When I read the part about the promotion problem I immediately thought "ah yes" - oversight on my part - sorry about that.

Not so the EP; I will investigate - thanks again. I have to admit, EP problems have followed me everywhere on my little chess adventure.

[op12no2]

no time controls - she moves in the time you move

Yeah , right. We'll all clean it up with those odds.

Yeah, well, every time I think about implementing time controls, I seem to find something more interesting to do. But yes, if it's going to be a useful site at all, I need to bite the bullet at some point...

[op12no2]

Also when I promote the pawn to queen, the gui does not allow it, or perhaps there is another method where I am not aware of. But pushing the pawn to 8th rank, the pawn will return back to 7th rank.

Fixed, thanks again Ferdinand. Well, fixed to the point that it assumes Q for now...

[op12no2]

no time controls - she moves in the time you move

Yeah , right. We'll all clean it up with those odds.

Primitive time-to-move added.

http://op12no2.me/toys/lozza/play.htm

[Ferdy]

Primitive time-to-move added.

When you set time to 10 sec (or any number that is not 1) and play the black side, the 10 sec will revert to 1 sec after pressing "play with black" button, as a result the engine playing white will only think for 1 sec. Changing the time again, and without pressing that button, the engine will play now based on the indicated time.

[op12no2]

When you set time to 10 sec (or any number that is not 1) and play the black side, the 10 sec will revert to 1 sec after pressing "play with black" button, as a result the engine playing white will only think for 1 sec. Changing the time again, and without pressing that button, the engine will play now based on the indicated time.

Thanks, I'll fix it.

Somebody asked me about running Lozza in Winboard/Arena. I wrote a post about it:-

http://op12no2.me/posts/1818

[Sylwy]

When you set time to 10 sec (or any number that is not 1) and play the black side, the 10 sec will revert to 1 sec after pressing "play with black" button, as a result the engine playing white will only think for 1 sec. Changing the time again, and without pressing that button, the engine will play now based on the indicated time.

Thanks, I'll fix it.

Somebody asked me about running Lozza in Winboard/Arena. I wrote a post about it:-

http://op12no2.me/posts/1818

Hey man !

I was two days in mountains ! A great news !

The thing really works !

Thank you !

S R