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AlphaZero (Computer) vs Stockfish (Computer)
AlphaZero - Stockfish (2017), London ENG, Dec-04
Queen's Indian Defense: Fianchetto. Nimzowitsch Variation (E15)  ·  1-0


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sac: 47.Rxc5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Dec-07-17  rodrigoporto: Skynet, is that you ?!
Premium Chessgames Member
  Cheapo by the Dozen: This is the third AlphaZero game I've looked at, and once again it seems that AlphaZero works hard to gain and extend a space advantage.
Dec-08-17  EhsanBalani: Hello everyone!
If 54...Rd4, then?
Dec-08-17  Nerwal: <If 54...Rd4, then?>

The prettiest is 54... ♖d4 55. ♖xf7 ♖xf4 56. ♖g7+ double check and mate.

Dec-08-17  virginmind: At first I thought why not 50.Qg5 and after Rxg6 on the next move it's mate in two. Not quite, as after 50...Re6 51.Bxe6 dxe6 black is still 2 pawns up and white's attack is likely over.
Dec-08-17  talwnbe4: 22.. Nd5

45.. Qh8?? isn't a move Stockfish would play on a single core at 5 seconds a move. 45.. Qc7


Dec-08-17  cata008: zugzwang masterpiece
Dec-08-17  jeffwadsworth: This is probably the best game IMO. Not just the sacrifices all over the board, but that ending squeeze.
Dec-08-17  Imran Iskandar: This is simply majestic chess.
Premium Chessgames Member
  WorstPlayerEver: Yeah, it's amazing. I tried to simulate the style of A0 for Black in this line. Whereupon Stockfish started to sac like crazy on f7 and d5. Black to move:

click for larger view

Stockfish thinks it equal. Truly weird.

Premium Chessgames Member
  varishnakov: <talwnbe4>

Yes, it's true that Stockfish on a single core at 5 seconds would not play 45...Qh8.

But Stockfish at 60 minutes (41 ply) would.
analysis of move 45...?

Dec-08-17  dehanne: Putting back the fish in Stockfish.
Dec-09-17  birimbombum: The disaster apparently happened on move ..43, when sf play Rf8 instead of Kf8. When analyzed with my own sf it happens that... I have random results. Strange, very very strange. Someone can explain this move? I can't.
Dec-09-17  birimbombum: Sorry. The move is ..49.
Dec-10-17  talwnbe4: Stockfish 8 x64
53/102 1:01:42 4,762,015k 1,286k -0.41 49..Kg8-f8 Qh4-f4 Qh8-g8 Qf4-c7 c5-c4 Qc7xc4 Re8-d8 Qc4-c7 Kf8-e8 Qc7xa7 Qg8-f8 Qa7-b6 Qf8xh6 Bb3xf7+ Re7xf7 Rf6xf7 Ke8xf7 Qb6xd8 Qh6-d2 Qd8-a8 Qd2-d4 a2-a4 Kf7-e6

Stockfish 8 x64

41/66 02:43 191,844k 1,175k +5.90 49..Rf8?? Qh4-f4 a7-a5 Bb3-d5 a5-a4 g3-g4 c5-c4 Bd5xc4 d7-d5 Bc4xd5 Re7-d7 Bd5-c6 Rd7-a7 g4-g5 Ra7-a5 Bc6-d7 Rf8-a8 Qf4-e3 Ra8-f8 Bd7-e6 Qh8xf6 g5xf6 Ra5-a8 Be6-c4 Ra8-c8

Premium Chessgames Member
  notyetagm: AlphaZero vs Stockfish, 2017

<Nerwal: <If 54...Rd4, then?>

<<The prettiest is 54... ♖d4 55. ♖xf7 ♖xf4 56. ♖g7+ double check and mate.>>>

click for larger view

click for larger view

click for larger view

Dec-12-17  dehanne: Stockfish was Fake Chess all along.
Dec-12-17  Grandma Sturleigh: No Alpha beater.
Dec-12-17  sudoplatov: What's the configuration of the computers? Does Stockfish have its opening tables and ending tables and transposition tables? Similarly for AlphaZero; are the implementations comparable?
Dec-13-17  s4life: I don't think the implementations are comparable, one is a self trained black box which is extremely hard to understand and interpret and the other one is a carefully crafted recipe with lots of thought and tuning invested into it... I guess you could say the machines truly won in this match
Dec-13-17  BenRedic: I do not understand why Stockfish played 49.. Rf8 here.

I have tried to reproduce this on my own computer. Google ran it on 64 threads, yielding like 70 million nps. On 6 cores I get around 8 million nps, so in 9 minutes Stockfish should come up with the same evaluation as it did in 1 minute for Google.

It does indeed consider Rf8 for a brief moment, but it switches to Kf8 after like 10 seconds, anticipating 50. Qf4. After 50 minutes and around 28 billion nodes, PV is 56/128 [+0.37] 49.... Kf8 50. Qf4 Qg8 51.Qc7 c4

Premium Chessgames Member
  WorstPlayerEver: <BenRedic>

You mean that the real Stockfish gives 49... Rf8 as the move which quickly loses (+6.5) and 49... Kf8= after a few secs.


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