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Magnus Carlsen vs Michael Adams
Tata Steel Masters (2016), Wijk aan Zee NED, rd 9, Jan-26
Italian Game: Italian Variation (C50)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 11 OF 11 ·  Later Kibitzing>
Jan-27-16  patzer2: <talwnbe4> Good catch on 56...Ke6 leading to a draw.

Deep Fritz 15 gives the line 56... Ke6 57. Ra2 Ne8 58. b5 cxb5 59. cxb5 Nc7 60. b6 Nd5+ 61. Ke4 Nxb6 62. Ra6 Kd7 63. Rxb6 Rxa7 64. f4 Ra2 65. Kf5 Ke7 66. Rb7+ Ke8 67. e6 Ra5+ 68. Kf6 fxe6 69. Kxe6 Ra6+ (+2.04 @ 35 depth; diagram below):


click for larger view

However, the Shredder 6-man table base at http://www.shredderchess.com/online... indicates the Fritz assessment of a win is nothing but engine noise as it's a table base draw.

So it would seem 49. Rb7!, instead of 49. b4?!, might be essential to assure White's win.

Jan-28-16
Premium Chessgames Member
  Eyal: <after 56..Ke6 it seems Adam's could have drawn but with a very precise series of moves. e.g, 56..Ke6 57. Ke4 Kd7 58. f4 Kc8 59. f5 Kb7 60. e6 f6 and now black can draw.>

First of all, if this was really drawing for Black then the decisive mistake would have been 57...f6 (instead of Kd7), not 56...Ke7 - the king can go to d7 from e7 just as much as from e6... But actually, 60.Kf4! is winning for White in this line. And in general, 49.b4 seems to be winning by force for White even if from a practical viewpoint it might have been more convenient to remove the rook from d2 (the point being that after 49...g2+ 50.Kh2?, 50...Ng6! 51.Nxg6 Nxf3+ wins this rook). "Normal" engines apparently have a problem figuring out White's win at first so that their evaluation drops, but as people were noting during the live broadcast, the tablebase-armed Norwegian supercomputer sesse (http://analysis.sesse.net) was showing a decisive advantage for White all along.

Jan-28-16  talwnbe4: augh !

56. ..Ke6 stops 57. Kf5.. but you're right!.. again Stockfish misses a critical line and not too deep into the search tree! 56..Ke6 57. Ke4 Kd7 58. f4 Kc8 59. Kf5 Ne8 60. Kg5! Kd7 61. f5 wins.I had to manually point out 60. Kg5 which seems a good candidate. This is Stockfish 5.

Jan-28-16  talwnbe4: maybe not so early in the tree.. the winning line after 56.. Ke6 e.g, 56..Ke6 57. Ke4 Kd7 58. f4 Kc8 59. Kf5 Ne8 60. Kg5 Kd7 61. f5 Kd8 62. Ra2 Kd7 63. b5 cxb5 64. cxb5 Kc7 65. Ra6 Kc8 66. Kh6

had to point out 63. b5 as a candidate to SF5

Jan-28-16  talwnbe4: 56..Ke6 57. Ke4 Kd7 58. f4 Kc8 59. Kf5 Ne8 60. Kg5! Kd7 61. f5 Kd8 62. Ra2 Kd7 63. b5! cxb5 64. cxb5 Kc7 65. Ra6 Kc8 66. Kh6 Kb7 67. Kh7 Kc7 68. f6 Kb7 69. Ra2 Kb6 70. Rd2 Rxa7 71. Rd8 completely wins
Jan-28-16  talwnbe4: Amazingly enough black can't hold this endgame even with an extra knight.
Jan-28-16  patzer2: <Eyal><talwnbe4> Thanks for confirming the win after 56...Ke6 57. Ke4 Kd7 58. f4 Kc8 59. f5 Kb7 60. Kf4! .

After I forced 60. Kf4!, Deep Fritz 15 found the win at around 21 to 22 depth.

I should have known to disregard the Fritz engine noise initially favoring 56...Ke6 57. Ra2 and gone for the active King with 56...Ke6 57. Ke4! which is similar to the win after 57...Kd7 58. f4 Kc8 59. Kf5! Ne8 60. Kg5! .

P.S.: The Norwegian supercomputer sesse, with its deep endgame table base search capacity, looks awesome. If Carlsen practices with it, I would think it would give him an advantage over other Super GMs who don't have as much computer power at their disposal. I wonder if a 32-piece table base might be a reality in the not too distant future?

Jan-28-16  patzer2: <Eyal> Do you have any additional information on the super computer sesse beyond what's available at http://www.sesse.net?

I didn't see it listed in the world's top ten super computers at http://www.top500.org/lists/2015/11/.

Apparently the Chinese super computer Tianhe-2 with 3,120,000 cores is consider the world's number one. My puny i7 running only four cores won't stand a chance when the new 32-piece table base software becomes available.

Jan-28-16  patzer2: Interesting article on the Chinese super computer Tianhe-2 at https://en.wikipedia.org/wiki/Tianh....
Jan-28-16  patzer2: In my web search on super computing, I've added the word "petaflop" to my vocabulary.

Apparently the world's fastest super computer in China runs at about 34 petaflops (a measure of super computing speed). The US is currently considering building one at Oak Ridge capable of running at 300 petaflops.

A petaflop is "thousand trillion floating point operations per second. "

Looks like that 32-piece table base might be just around the corner.

Jan-28-16  RandomVisitor: After 56...Ke6 and an adjustment to Komodo to work with less 'late move reduction' (in other words, it searches more thoroughly deep in the tree):


click for larger view

Komodo-9.3-64bit: 5-piece syzygy

<+2.18/35 57.Ke4 Kd7 58.f4 Kc8 59.f5 Kb7 60.Kf4> Rd8 61.Kg5 Rd7 62.e6 fxe6 63.f6 e5 64.Kg6 Rd6 65.Kf5 Rd2 66.f7 Rf2+ 67.Kg6 e4 68.Ra5 e3 69.Ra3 e2 70.Re3 Kxa7 71.Rxe2 Rxe2 72.f8Q Kb7 73.Qf3 Re5 74.Qf4 Re8 75.Kh5 Re1 76.Qf5 Rd1 77.Qe4 Rd8 78.Qh7 Rd4 79.Qf7 Rd1 80.Kh4 Rb1 81.Qe7 Rd1

Jan-28-16  RandomVisitor: Adams should have played 19...Rxe4 20.Rxe4 Nxe4 and now white has nothing:


click for larger view

Komodo-9.3-64bit:

+0.00/30 21.Nxg7 Kxg7 22.Qg4+ Ng5 23.h4 c5 24.Nb5 f5 25.Qg3 f4 26.Qg4 Qc8 27.Qxc8 Nxc8 28.hxg5 hxg5 29.Rd1 Ra6 30.f3 c4 31.Kf2 Kf6 32.g3 Rc6 33.gxf4 gxf4 34.Rd4 Kg5 35.Rd1 Rc5 36.Rg1+ Kf6 37.Rg4 Ke5 38.Rg7 Kf6 39.Rg4

+0.00/30 21.Qg4 Nxf5 22.Nxf5 Ng5 23.h4 Ne6 24.Nxh6+ Kf8 25.Nf5 Qf6 26.Re1 g6 27.Nd4 Nxd4 28.cxd4 Kg7 29.g3 b5 30.axb5 Rb8 31.Qd7 Qxd4 32.b3 Qd2 33.Re3 Qd1+ 34.Kh2 Qd2 35.Kg1

Jan-28-16
Premium Chessgames Member
  Open Defence: i dont know if i pointed it out during the game but i was surprised by Re5 instead of Rxe4
Feb-01-16  Teedeeboy: Why didn't Carlsen play 47Nxg3+? After ...Nxg3+ 48Kh2 Nh5 49Rd7 the connected far passed pawns(which later cost him a rook) are negated, a7 is protected, and the f7 or h6 pawn must fall. If Adams protects the f pawn then Re7, Rdd7 (re-hitting f7) Rb7 and Rb8 wins the rook. I just looks dead won for MC, unlike the actual ending.
Feb-05-16  yurikvelo: Adams lost this game twice.
24. ... Kh7? (Rd7!), 40. ... g3??? 29. ... Qf2? 37. ... h4?

In a winning position Carlsen play 49.b4? and discard all Adams' mistakes.

Adams keep making mistakes and gift Carlsen a win second time 57. ... f6? and 60. ... Nd6??

multiPV: http://pastebin.com/NPf9g8Jp

Feb-05-16
Premium Chessgames Member
  perfidious: <patzer2....Looks like that 32-piece table base might be just around the corner.>

To think that when I had Fritz 5.32 at the end of my playing days, the 5-6 piece Nalimovs were impressive.

The time is coming; don't know as I like it.

Feb-05-16
Premium Chessgames Member
  Eyal: <yurikvelo: In a winning position Carlsen play 49.b4? and discard all Adams' mistakes.

Adams keep making mistakes and gift Carlsen a win second time 57. ... f6? and 60. ... Nd6??>

Adams didn't gift Carlsen anything with those moves; as was already illustrated in several previous comments here, 49.b4 is winning - normal engines just have trouble figuring this out. The Komodo line 60...Nf6 61.Ra6 Nd7+ 62.Kd4 Kd8 63.f6 Kc7 64.f7 Kb7 given in your link as supposedly better for Black is completely winning for White.

Feb-06-16  scholes: B1 knigth had fantastic journey in the game

b1-a3-c2-e3-f5-g3-f1-e3-c4-a5-b7-d6-f5-h4-g2

Gobbling up two pawns and finally sacrificing at g2 for better endgame. Carlsen generally makes better use of bishop.

Feb-06-16  yurikvelo: <The Komodo line 60...Nf6 given in your link as supposedly better for Black is completely winning for White.>

60. ... Nf6 is completely winning for White.
Even if Adams play 57. ... Kd7 (not f6?) it is still win, but not easy

Apr-09-16  bobbyperez: 13.Bxa7?! (13.Qd2 is better.) 13...Rxa7!= is the best move.However, he played 13...Nxa7?!.That mistake is caused by theory!!!!!!!!!
Apr-09-16  bobbyperez: 13.Bxa7?! (13.Qd2 is better.) 13...Rxa7!= is the best move.However, he played 13...Nxa7?!.
Apr-09-16  bobbyperez: That mistake is caused by the theory.
Apr-09-16  drleper: <patzer2: Looks like that 32-piece table base might be just around the corner.>

I can't see where we are going to find the space to store it all. There are 7-piece tablebases that already require something silly (maybe 150TB of storage) and while you can feed a position in and get the correct answer, it apparently can't be practically searched (i.e. for use in an engine). Even if you could compute 32-piece tablebases, the storage space required for them would be just off the charts, as in way, way off the charts.

Apr-20-16  yurikvelo: 7-piece is 1400 TB and current implementation lack DTZ (Distance-to-Zero), so it doesn't support 50-move rule and often give DTM>50 even from root. It is possible to generate Syzygy-7, it will take around 1000 GB of RAM and 150 TB storage. RTBW files about 70 TB

8-man estimated 300 000 TB (Nalimov/Lomonosov format)

32-piece TB size is orders more than number of electrons in Universe.

Nov-01-16  Ruben Meijerink: I always hear Italian game isn't played at a serious level?
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