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Up Topic The Rybka Lounge / Computer Chess / Fun with an inexpensive Android phone
- - By MrKris (***) Date 2019-03-30 06:49 Edited 2019-03-30 07:13 Upvotes 1
Phone: free with sign-up, Android 7, Qualcom 4-core 64-bit Snapdragon.

White:
Chess for Android , Aart Bik
https://play.google.com/store/apps/details?id=com.google.android.chess
The built-in engine at the 5 seconds a move level a 'training'/'find the refutation' engine, it has several shorter and longer levels, and can import other engines, save games etc. (I am guessing 1-core for battery life.)

Black's helper, a few seconds per move, sometimes with multi-PV:
OpeningTree - Chess Openings , Mike Adams
https://play.google.com/store/apps/details?id=com.lantern.michaeladams.openingtreechess
The opening database is maybe a little small to fit on any device (short rare sideline variations) but it works and is easy to use.
It will analyse with Stockfish 10 32-bit with 1 to 4 cores (I like 3, my phone is too slow with 4).

(Notes by briefly the current Stockfish on my desktop.)

Stockfish android quickly found how to take advantage of 8.O-O-O?.

[Event ""]
[Site ""]
[Date "2019.03.29"]
[Round "?"]
[White "Chess for Android, 5 secs./move"]
[Black "OpeningTree/Stockfish android"]
[Result "0-1"]
[ECO "D35"]
[Opening "QGD"]
[Time "20:23:20"]
[Variation "Exchange, 5.Bg5 Be7"]
[TimeControl "1800+30"]
[Termination "normal"]
[PlyCount "46"]
[WhiteType "human"]
[BlackType "human"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. cxd5 {end of white's book} exd5
6. Qd2 {?!, 6.e3} h6 7. Bxf6 Bxf6 8. O-O-O {?} (8.e3 {about 0.00}) O-O 9. f3 {?!} (9. e3 {about -0.80
disadvantage for white}) 9. .. c5 {best, about +1.50 advantage for black}
10. dxc5 Na6 11. Qxd5 {??} (11. e3 Nxc5 {about +2.00 for black}) 11.
.. Qa5 {!, about +6.50 clearly winning advantage for black --the point of 9...c5, white's king is too weak now vs. black's active pieces, good for Sf android I thought--} 12. Ne4 {?!}
Be6 {Sf about +10.40 for black} 13. Qxb7 {?} Nxc5 {Mate in 12 desktop later, Sf android quickly had it best though} 14. Nxf6+
gxf6 15. Qe7 {?} Bxa2 {?! Mate in 8, desktop later 15...Rac8! Mate in 7} 16. Qxf6 Nd3+ 17.
Rxd3 Qe1+ 18. Kc2 Bb1+ 19. Kb3 Rab8+ 20. Kc4 Qb4+ 21. Kd5 Rb5+ 22. Kc6 Qc5+
23. Kd7 Rb7# 0-1


Stockfish android quickly found the numerous tactical solutions associated with its moves in the game.

[Event ""]
[Site ""]
[Date "2019.03.29"]
[Round "?"]
[White "Chess for Android, 5 secs./move"]
[Black "OpeningTree/Stockfish android"]
[Result "0-1"]
[ECO "C47"]
[Opening "Four Knights"]
[Time "21:46:15"]
[Variation "Italian Variation"]
[TimeControl "1800+30"]
[Termination "adjudication"]
[PlyCount "44"]
[WhiteType "human"]
[BlackType "human"]

1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. Bc4 {?! Opening Tree} Nxe4 5. Nxe4 d5 6.
Bxd5 {Not in Opening Tree} Qxd5 7. Nc3 Qd6 {best, about +1.00 for black} 8.
O-O Be6 9. Re1 (9. d3) 9. .. O-O-O 10. Re3 {?} (10. d3) 10. .. Bg4 {(!)
about +2.00 for black --justifying the tempo loss ...Bc8-e6-g4 this sets up pin, pawn fork, back rank and undeveloped pieces themes, good for Sf android I thought--} 11. Rd3 {?} (11. Ne2) 11. .. Nd4 {! almost +3.00 for
black} 12. Nb5 Qg6 {!} 13. Nxe5 {best, although it loses a piece} (13. Nbxd4
e4 14. h3 Bh5 15. Re3 {?} (15. Ne2 exd3 16. Nf4 dxc2 17. Qe1 Qh6 18. Nxh5
Qxh5) 15. .. Rxd4 16. g4 exf3 17. Kf1 {?} (17. Qxf3 Bxg4 18. hxg4 Rxg4+ 19.
Kf1 Bc5 20. Re5 Bd6 21. Qf5+ Kd8 22. Qxg6 hxg6 23. Re3 Rh1+ 24. Ke2 Rgg1)
17. .. f5 18. gxh5 {??} (18. Qxf3 fxg4) 18. .. Qg2+ 19. Ke1 Qg1#) 13. ..
Bxd1 14. Nxg6 hxg6 15. Rxd4 Re8 16. h4 {?} (16. h3 a6 17. Nc3 Bxc2 {black is winning though the material is still even; for
example, white's moves may not be best:} 18. Kf1 Bc5 19. Rd5 Ba7 20. d3 c6
21. Rd6 Bc5) 16. .. a6 17. Nc3 Re1+ 18. Kh2 Bc5 {best} 19. Nxd1 {?} (19. Rc4 {loses by only a bishop}
Bd6+ 20. f4 (20. g3 {??} 20. .. Bf3 21. Rxc7+ Bxc7 22. a3 Rxh4#) (20. Kh3 {??} Rh1#)
20. .. Rxh4+ 21. Kg3 Rhh1 22. Nxd1 Rxd1) 19. .. Bxd4 20. Ne3 Bxe3 21. dxe3
Rxh4+ 22. Kg3 Rhh1 {adjudicated, white a rook down} 0-1
Parent - - By AartBik (**) Date 2019-04-05 04:13 Upvotes 1
Thanks for sharing the games!
Parent - - By MrKris (***) Date 2019-04-07 11:22
I am assuming you are THE Aart Bik, thank you for the reply!!

Thank you very much for your fantastic GUI, also for your very fascinating training engine in it!!!
Parent - - By AartBik (**) Date 2019-04-15 00:54
A comment like that makes me blush of course, but I am indeed the author of Chess for Android.

I am really glad you like the app!

I also hope you will enjoy an upcoming feature I have been working on recently: FICS support and the DGT 3000 clock.
Parent - - By MrKris (***) Date 2019-04-18 18:24
Windows 64 UCI version of Bikjump http://www.aartbik.com/strategy.php .

Bikjump, no book, played an unusual defense and has it near even before Hannibal sacrificed 19.Nxf7.
Bikjump defended the attack then went on to win.

[Event "AMD PhII X6 - 1cpu"]
[Site "6 seconds/move"]
[Date "2019.04.17"]
[Round "?"]
[White "Hannibal1.4bx64"]
[Black "Bikjump"]
[Result "0-1"]
[BlackElo "2000"]
[ECO "B07"]
[Opening "Pirc"]
[Time "19:42:49"]
[Variation "3.Bd3 g6 4.Nf3"]
[WhiteElo "2500"]
[TimeControl "0+6"]
[Termination "normal"]
[PlyCount "141"]
[WhiteType "program"]
[BlackType "program"]

1. e4 {Hannibal own book} d6 {-0.06/11 6} 2. d4 Nf6 {-0.06/10 6} 3. Nc3 Nbd7 {-0.12/10 4} 4.
Nf3 e6 {-0.19/10 4} 5. Bf4 {+0.58/17 4} Be7 {-0.25/10 5} 6. Bd3 {+0.63/19
3} O-O {-0.21/10 5} 7. O-O {+0.56/19 5} Nb6 {-0.23/11 6} 8. Qe2 {+0.88/19
4} Bd7 {-0.19/10 4} 9. a4 {+0.96/18 5} a5 {-0.20/10 6} 10. Nb5 {+0.89/20 6}
Nh5 {-0.23/10 5} 11. Bd2 {+1.08/17 5} c6 {-0.27/11 6} 12. Nc3 {+0.86/20 5}
Nf6 {-0.25/11 6} 13. Rae1 {+1.05/16 6} Re8 {-0.26/10 4} 14. e5 {+0.88/18 5}
dxe5 {-0.21/12 6} 15. Nxe5 {+1.07/19 4} Bc8 {-0.14/10 4} 16. Bg5 {+0.94/16
6} Qxd4 {-0.09/11 6} 17. Bxf6 {+0.85/20 6} Bxf6 {-0.07/12 5} 18. Bxh7+
{+0.42/21 6} Kf8 {-0.08/13 5} 19. Nxf7 {+0.35/20 6} Kxf7 {+0.65/12 6} 20.
Qh5+ {+1.00/21 6} Ke7 {+0.67/13 6} 21. Re4 {0.00/20 3} g6 {+0.59/11 4} 22.
Bxg6 {0.00/19 4} Rh8 {+0.54/12 6} 23. Bh7 {+0.16/21 3} Qd8 {+0.47/11 5} 24.
Rd1 {0.00/21 5} Nd7 {+0.47/10 6} 25. Qf5 {+0.70/17 6} e5 {+0.37/9 3} 26.
Ne2 {+1.07/20 4} Qc7 {+0.92/10 6} 27. Nf4 {-0.72/18 5} Nf8 {+0.95/11 5} 28.
Ng6+ {-0.70/22 6} Nxg6 {+0.39/12 7} 29. Qxg6 {-0.81/22 6} Be6 {+0.42/11 5}
30. f4 {-0.94/23 5} Qb6+ {+0.42/11 6} 31. Kh1 {-0.92/22 6} Rhd8 {+0.36/11
5} 32. Rde1 {+0.48/19 4} Qxb2 {+0.21/11 4} 33. Qh5 {+0.35/18 6} Bd5
{+0.47/9 4} 34. R4e2 {0.00/18 4} Bf7 {+0.63/10 4} 35. Qf5 {0.00/22 5} Be6
{+0.44/11 6} 36. Qg6 {0.00/23 5} Rd5 {+0.71/11 6} 37. h3 {0.00/21 4} Qc3
{+1.68/9 5} 38. Re3 {-0.72/19 5} Qd4 {+0.61/11 6} 39. Qh6 {-0.47/19 5} b5
{+2.01/10 5} 40. axb5 {-0.31/17 5} cxb5 {+1.91/10 5} 41. fxe5 {-1.17/20 6}
Rxe5 {+2.17/12 5} 42. Rxe5 {-0.47/18} Bxe5 {+2.14/12 4} 43. Be4 {-4.08/18
3} Qf2 {+2.53/9 6} 44. Qg5+ {-4.41/19 5} Bf6 {+2.32/13 4} 45. Qc1 {-4.52/21
3} Rd8 {+2.53/11 5} 46. Bd3 {-4.55/21 5} Rd5 {+2.45/11 5} 47. Rf1 {-3.87/18
6} Qd4 {+2.55/10 4} 48. Qh6 {-4.42/19 6} Qh4 {+2.58/10 6} 49. Qe3 {-4.81/19
6} Bd4 {+2.36/10 5} 50. Qf3 {-4.32/21 6} Be5 {+2.49/9 3} 51. Qf8+ {-4.74/21
4} Kd7 {+2.55/2} 52. Bf5 {-4.88/19 6} Bxf5 {+2.52/11 5} 53. Qxf5+
{-4.90/18} Kd6 {+2.54/12 6} 54. Qf8+ {-5.64/19 6} Qe7 {+2.54/11 5} 55. Qb8+
{-4.41/18 5} Qc7 {+2.68/9 5} 56. Qf8+ {-4.38/20 3} Kc6 {+2.60/10 3} 57.
Qa8+ {-4.64/21 6} Kc5 {+2.69/12 4} 58. Re1 {-4.90/20 6} Bg3 {+2.60/10 6}
59. Rb1 {-4.46/22 5} Qd6 {+2.59/10 6} 60. Qa7+ {-4.76/22 6} Kc4 {+2.59/12
4} 61. Qf7 {-5.01/21 6} b4 {+2.72/11 4} 62. Rd1 {-4.84/19 6} a4 {+3.10/12
5} 63. Qf1+ {-6.24/20 5} Kc5 {+3.50/12 6} 64. Qg1+ {-7.17/21 6} Kb5
{+3.69/12 4} 65. c4+ {-7.52/21 5} Kxc4 {+5.07/13 5} 66. Qf1+ {-8.69/24 6}
Kc5 {+5.07/12 6} 67. Rc1+ {-10.07/23 6} Kb6 {+5.07/11 6} 68. Qg1+
{-10.74/22 6} Kb7 {+5.35/14 6} 69. Rf1 {-10.58/24 4} b3 {+6.54/13 6} 70.
Rf7+ {-11.07/23 6} Kc8 {+6.65/12 5} 71. Qc1+ {-19.24/24 5 White resigns} 0-1
Parent - - By AartBik (**) Date 2019-04-21 00:53
Thanks for posting a win. There are not too many of those :-)
Parent - By MrKris (***) Date 2019-04-21 12:29
You are welcome! That was the first thing I tried on my desktop (I already had Hannibal).
It is no longer 100% :-(, but I like the way the opponent has to find moves like 10...f4:

[Event "5 secs./move, 1-cpu"]
[Site "AMD PhII X6"]
[Date "2019.04.21"]
[Round "?"]
[White "Bikjump"]
[Black "Komodo-tcecr-64bit"]
[Result "0-1"]
[BlackElo "2800"]
[ECO "A29"]
[Opening "English"]
[Time "04:27:23"]
[Variation "Four Knights, 4.g3 d5"]
[WhiteElo "2400"]
[TimeControl "0+5"]
[Termination "normal"]
[PlyCount "49"]
[WhiteType "human"]
[BlackType "program"]
[FEN "r1bqkb1r/ppp3p1/2n2n1p/4pp2/2Pp4/3P1NN1/PP1BPPPP/R2QKB1R w KQkq - 1 10"]

10. Nh4 {+0.04/11 5} (10. e4 {Ko. -0.57})
.. f4 {+1.51/19 4} 11. Ng6 {-0.16/12 3} fxg3 {+1.61/19 4} 12. Nxh8
{-0.15/12 5} gxf2+ {+1.65/20 4} 13. Kxf2 {-0.15/2} Qd7 {+1.63/19 4} 14. Kg1
{-0.05/11 8} Qf5 {+1.68/20 4} 15. Qa4 {-0.14/12 4} (15. g3 Ng4 16. Qe1 Qh7 17. h3 Nf6 18.e3 Be6 19.Bg2 O-O-O) 15. .. Ng4
{+7.99/20 4} 16. Be1 {-4.17/13 5} Bb4 {+8.10/20 4 , !} 17. Qxb4 {-4.20/13 4}
(17. Qd1 Ne3) (17. Bg3 Bd2 {Mate in 4})
Ne3 {+8.22/21 4} 18. Bc3 {-4.83/12 4} Nxb4 {+8.32/20 4} 19. Bxb4 {-4.28/13
5} Nc2 {+8.38/20 4} 20. Ba5 {-6.47/12 3} Nxa1 {+9.55/20 4} 21. Bxc7
{-9.68/12 4} Nc2 {+21.13/19 4} 22. g3 {-12.13/13 5} Qg5 {+M22/20 4} 23. Ba5
{-12.13/12 5} Qe3+ {+M14/18 4} 24. Kg2 {-14.45/2} b6 {+M12/19 4} 25. Nf7
{-14.45/11 4 White resigns} 0-1
Parent - - By Gaмßito (****) Date 2019-04-29 10:52
No offense but that victory against Hannibal it's honestly impossible to believe and must be some miracle, literally. BikJump 2.1 is too weak.

I downloaded BikJump 2.1 (64 bits) and it played 10 games (3'+2'') against Fritz 5.32 (an engine that it's hundreds of points weaker than Hannibal!). BikJump lost the match by 9.5 to 0.5 points!

Regards,
Gaмßito.
Parent - By MrKris (***) Date 2019-04-30 06:45
Yes, I agree that Bikjump was lucky, several losses after my post, but "impossible" is always too strong a word for engines.
I am sorry if the win gave you a wrong impression about it. I then just posted 1 loss that I subjectively liked.
In my reply to the author " It is no longer 100% :-( " --100% of the 1 of 1 tries at my first post-- I meant to agree with his " Thanks for posting a win. There are not too many of those :-) "

I do not see anything wrong the .pgn I saved at the time, below.

The Hannibal I used was an intermediate version between 1.4 (1 cpu) and 1.5 (multi-threads), I do not remember why I had it:
http://www.chess2u.com/t5819-hannibal -- consecutive posts although months apart:
" Re: Hannibal
Post on Thu 26 Sep 2013, 9:19 am by
Guest
CEGT - Testing Hannibal 1.4...
Code:
    Hannibal 1.4 x64 1CPU = ELO 2862 out of  500 games (+22)
    Hannibal 1.3 x64 1CPU = ELO 2840 out of 3200 games
http://cegt.siteboard.eu/f6t912-testing-hannibal-1-4.html?sid=5897f58ad4e52c2b8d597c290be5dddf

Hannibal 1.5 release
Post on Wed 28 Jan 2015, 2:02 am by
mcdiniz
Hannibal 1.5 release
https://sites.google.com/site/edapostol/Hannibal1.5.zip?attredirects=0&d=1
"

In the game in my post Hannibal 1.4b made the unsound knight sacrifice 19.Nxf7? and then overvalued its game.
Note the time control was "0+6", 6 seconds per move, similar to its Android levels 2, 5, 10 etc. seconds/move, maybe Hannibal was unlucky/mildly flawed with that.
Once black made a few good defensive moves it had an easy, even for weaker engines, tactics with a piece up.
White had to allow exchanges into a lost piece down ending because its 'attacking' bishop on h7 was in danger of being trapped and lost also.
[Event "Han. with own book"]
[Site "6 secs./move"]
[Date "2019.04.17"]
[Round "?"]
[White "Hannibal1.4bx64"]
[Black "Bikjump"]
[Result "0-1"]
[BlackElo "2000"]
[ECO "B07"]
[Opening "Pirc"]
[Time "19:42:49"]
[Variation "3.Bd3 g6 4.Nf3"]
[WhiteElo "2500"]
[TimeControl "0+6"]
[Termination "normal"]
[PlyCount "141"]
[WhiteType "program"]
[BlackType "program"]

1. e4 d6 {-0.06/11 6} 2. d4 Nf6 {-0.06/10 6} 3. Nc3 Nbd7 {-0.12/10 4} 4.
Nf3 e6 {-0.19/10 4} 5. Bf4 {+0.58/17 4} Be7 {-0.25/10 5} 6. Bd3 {+0.63/19
3} O-O {-0.21/10 5} 7. O-O {+0.56/19 5} Nb6 {-0.23/11 6} 8. Qe2 {+0.88/19
4} Bd7 {-0.19/10 4} 9. a4 {+0.96/18 5} a5 {-0.20/10 6} 10. Nb5 {+0.89/20 6}
Nh5 {-0.23/10 5} 11. Bd2 {+1.08/17 5} c6 {-0.27/11 6} 12. Nc3 {+0.86/20 5}
Nf6 {-0.25/11 6} 13. Rae1 {+1.05/16 6} Re8 {-0.26/10 4} 14. e5 {+0.88/18 5}
dxe5 {-0.21/12 6} 15. Nxe5 {+1.07/19 4} Bc8 {-0.14/10 4} 16. Bg5 {+0.94/16
6} Qxd4 {-0.09/11 6} 17. Bxf6 {+0.85/20 6} Bxf6 {-0.07/12 5} 18. Bxh7+
{+0.42/21 6} Kf8 {-0.08/13 5} 19. Nxf7 {+0.35/20 6} Kxf7 {+0.65/12 6} 20.
Qh5+ {+1.00/21 6} Ke7 {+0.67/13 6} 21. Re4 {0.00/20 3} g6 {+0.59/11 4} 22.
Bxg6 {0.00/19 4} Rh8 {+0.54/12 6} 23. Bh7 {+0.16/21 3} Qd8 {+0.47/11 5} 24.
Rd1 {0.00/21 5} Nd7 {+0.47/10 6} 25. Qf5 {+0.70/17 6} e5 {+0.37/9 3} 26.
Ne2 {+1.07/20 4} Qc7 {+0.92/10 6} 27. Nf4 {-0.72/18 5} Nf8 {+0.95/11 5} 28.
Ng6+ {-0.70/22 6} Nxg6 {+0.39/12 7} 29. Qxg6 {-0.81/22 6} Be6 {+0.42/11 5}
30. f4 {-0.94/23 5} Qb6+ {+0.42/11 6} 31. Kh1 {-0.92/22 6} Rhd8 {+0.36/11
5} 32. Rde1 {+0.48/19 4} Qxb2 {+0.21/11 4} 33. Qh5 {+0.35/18 6} Bd5
{+0.47/9 4} 34. R4e2 {0.00/18 4} Bf7 {+0.63/10 4} 35. Qf5 {0.00/22 5} Be6
{+0.44/11 6} 36. Qg6 {0.00/23 5} Rd5 {+0.71/11 6} 37. h3 {0.00/21 4} Qc3
{+1.68/9 5} 38. Re3 {-0.72/19 5} Qd4 {+0.61/11 6} 39. Qh6 {-0.47/19 5} b5
{+2.01/10 5} 40. axb5 {-0.31/17 5} cxb5 {+1.91/10 5} 41. fxe5 {-1.17/20 6}
Rxe5 {+2.17/12 5} 42. Rxe5 {-0.47/18} Bxe5 {+2.14/12 4} 43. Be4 {-4.08/18
3} Qf2 {+2.53/9 6} 44. Qg5+ {-4.41/19 5} Bf6 {+2.32/13 4} 45. Qc1 {-4.52/21
3} Rd8 {+2.53/11 5} 46. Bd3 {-4.55/21 5} Rd5 {+2.45/11 5} 47. Rf1 {-3.87/18
6} Qd4 {+2.55/10 4} 48. Qh6 {-4.42/19 6} Qh4 {+2.58/10 6} 49. Qe3 {-4.81/19
6} Bd4 {+2.36/10 5} 50. Qf3 {-4.32/21 6} Be5 {+2.49/9 3} 51. Qf8+ {-4.74/21
4} Kd7 {+2.55/2} 52. Bf5 {-4.88/19 6} Bxf5 {+2.52/11 5} 53. Qxf5+
{-4.90/18} Kd6 {+2.54/12 6} 54. Qf8+ {-5.64/19 6} Qe7 {+2.54/11 5} 55. Qb8+
{-4.41/18 5} Qc7 {+2.68/9 5} 56. Qf8+ {-4.38/20 3} Kc6 {+2.60/10 3} 57.
Qa8+ {-4.64/21 6} Kc5 {+2.69/12 4} 58. Re1 {-4.90/20 6} Bg3 {+2.60/10 6}
59. Rb1 {-4.46/22 5} Qd6 {+2.59/10 6} 60. Qa7+ {-4.76/22 6} Kc4 {+2.59/12
4} 61. Qf7 {-5.01/21 6} b4 {+2.72/11 4} 62. Rd1 {-4.84/19 6} a4 {+3.10/12
5} 63. Qf1+ {-6.24/20 5} Kc5 {+3.50/12 6} 64. Qg1+ {-7.17/21 6} Kb5
{+3.69/12 4} 65. c4+ {-7.52/21 5} Kxc4 {+5.07/13 5} 66. Qf1+ {-8.69/24 6}
Kc5 {+5.07/12 6} 67. Rc1+ {-10.07/23 6} Kb6 {+5.07/11 6} 68. Qg1+
{-10.74/22 6} Kb7 {+5.35/14 6} 69. Rf1 {-10.58/24 4} b3 {+6.54/13 6} 70.
Rf7+ {-11.07/23 6} Kc8 {+6.65/12 5} 71. Qc1+ {-19.24/24 5 White resigns} 0-1
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