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Up Topic The Rybka Lounge / Test Positions / AlphaZero vs Stockfish Analysis Test Positions
- - By CSullivan (**) [us] Date 2018-02-17 17:37 Upvotes 2
If you are looking for a difficult position to analyze, here is the position after White's 35th move of AlphaZero vs. Stockfish8 (usually labelled as Game 9):
[Event "Game 9 -- Analysis: Drawing variation"]
[Site "Somewhere in Silicon Valley"]
[Date "2017.12.15"]
[White "AlphaZero"]
[Black "Stockfish8"]
[Result "1-0"]
[Annotator "Sullivan,Charles"]
[SetUp "1"]
[FEN "3k2r1/1b3q2/1p2pPpQ/pP1pP3/P2P3P/8/2RK4/8 b - - 0 35"]

{In this position, Black can make White's win very difficult by setting a trap:}
35... g5 36. hxg5 Bc8{. Now, why does the (fairly obvious)} 37. Rc6 {fail to win?  I
give what I consider the main line (which took a while to discover and took
even longer to completely verify):} Bd7 38. Rxb6 Kc7 39. Rd6 Kb8 $3 40. b6 Qe8
$3 41. Qh7 Rh8 42. Qxd7 Rh2+ 43. Ke1 Rh1+ 44. Kf2 Rh2+ 45. Kg3 Rh3+ $1 46. Kxh3
Qh5+ {and Black draws by perpetual check.} 1-0



[Event "Game 9 -- Analysis: Winning variation"]
[Site "Somewhere in Silicon Valley"]
[Date "2017.12.15"]
[White "AlphaZero"]
[Black "Stockfish8"]
[Result "1-0"]
[Annotator "Sullivan,Charles"]
[SetUp "1"]
[FEN "3k2r1/1b3q2/1p2pPpQ/pP1pP3/P2P3P/8/2RK4/8 b - - 0 35"]

{So, after} 35... g5 36. hxg5 Bc8 {what is the winning move?  Moving the King
away (I presume) from possible perpetual checks, White wins with} 37. Kc1 $3 Bd7 38. Kb1 $3
Ke8 39. Ka2 $3 {and I give the following interesting line:} Qg6 40. Rf2 Kf7 41.
Rh2 Qxh6 42. gxh6 Ra8 43. h7 Rh8 44. Kb2 Be8 45. Rh6 $1 Kf8 46. Kc3 Bf7 47. Kd2
Be8 48. Ke3 Bf7 49. Kf4 Bg6 50. Rxg6 Rxh7 51. Rg7 Rh4+ 52. Kg5 Rxd4 53. Re7 Rd1
54. Rxe6 Rg1+ 55. Kf4 Rf1+ 56. Ke3 Re1+ 57. Kd2 Rf1 58. Rxb6 Kf7 59. Ke3 Re1+
60. Kd4 Rd1+ 61. Kc5 Rc1+ 62. Kxd5 Rd1+ 63. Kc4 Rc1+ 64. Kd3 Rd1+ 65. Ke2 Rd5
66. e6+ Kxf6 67. e7+ Kxe7 68. Ra6 Re5+ 69. Kd3 Rd5+ 70. Kc4 Rd1 71. Rxa5 {
and Black loses in 24 moves, according to the endgame tablebases.} 1-0

Parent - - By free Willy (*) Date 2018-02-18 14:36
where can I download Alpha zero
ty
Parent - - By McBrain [us] Date 2018-02-18 21:58
We all wish we could download AlphaZero.   It is owned by Google, not available for download and it runs on TPUs.  According to Wiki, AlphaZero was trained solely via "self-play" using 5,000 first-generation TPUs to generate the games and 64 second-generation TPUs to train the neural networks, all in parallel, with no access to opening books or endgame tables.

https://en.wikipedia.org/wiki/AlphaZero

This page looks like it was written by Google since it is very pro Google and it appears to be one-sided.  There were issues with the match in that settings used were  less than optimal for SF, as well as playing against a dated version of SF as well (SF8).  Regardless, AlphaZero play was impressive.
Parent - By free Willy (*) Date 2018-02-19 08:01
the hype around alpha zero is overrated
we are talking about positions of an engine which is not intended for the public. Well... what a bullshit.
peace and out
Parent - - By user923005 (****) [us] Date 2018-02-20 21:27
If the TPUs were for sale (they are not) and you had the million dollars to buy them and if they released the source code or binary for AlphaZero then you could try it.
But as it is, we can only look through the window.
Parent - By ChrisW (**) Date 2018-03-03 09:21
we'll see if the emulation attempts get anywhere - they may do. or part do, and if there is some success, then various people will have moved up the learning curve, ready for the days when PCs come with TPU  (Intel or nvidia clones) as relative standard.

is still an open question whether highly tuned hand crafted AB can hold out against superior but slower brained ANNs. In chess. We will see. What AZ did show is is that a) Stockfish paradigm is by no means god like and b) AI's can generate chess games which remain "comprehensible" to strong humans (as opposed to a 32EGTB which I think would destroy interest, it's the fallibiity and openness to logical critique which maintains the interest)
Up Topic The Rybka Lounge / Test Positions / AlphaZero vs Stockfish Analysis Test Positions

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