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Up Topic The Rybka Lounge / Test Positions / Kasparov vs World, 1999 endgame
- - By Mr. beo (*) [ru] Date 2016-01-28 12:31
Hello

I would like to talk about endgame in famous Kasparov versus The World game (1999). Position after 50 moves:
7Q/1p6/3p2K1/6P1/8/8/8/1k1q4 w - -

After 51.Qh7 b5 52.Kf6+:
8/7Q/3p1K2/1p4P1/8/8/8/1k1q4 b - -

Now Wikipedia says that move 52...Kb2 played by World's team was a mistake and Kasparov could force a win with 53.Qe4 move. My analysis shows that Kb2 wasn't a mistake and Qe4 leads to draw. I don't have access to Lomonosov tablebase though. I would appreciate if somebody would post an explanation if Qe4 leads to win for white or not. Thank you.
Parent - By user923005 (****) [us] Date 2016-01-28 22:28
For the 1st position, Lomonosov 7 man files say Kc1 and Kb2 both draw. All other moves lose.

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1/2-1/2"]
[SetUp "1"]
[FEN "8/7Q/3p1K2/1p4P1/8/8/8/1k1q4 b - -"]

1...Kc1 1/2-1/2


№  Move  DTM  №  Move  DTM
1  Kb1c1  0  6  Qd1d3  -6
2  Kb1b2  0  7   
3  Kb1a1  -54  8   
4  Kb1a2  -54  9   
5  Qd1c2  -20  10   


For this position, every move draws excepth Kg7:

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1/2-1/2"]
[SetUp "1"]
[FEN "7Q/1p6/3p2K1/6P1/8/8/8/1k1q4 w - -"]

1.Qg8 1/2-1/2


№  Move  DTM  №  Move  DTM
1  Qh8g8  0  6  Qh8b8  0
2  Qh8f8  0  7  Qh8a8  0
3  Qh8e8  0  8  Qh8h7  0
4  Qh8d8  0  9  Kg6g7  -61
5  Qh8c8  0  10   
- By Mr. beo (*) [ru] Date 2016-01-28 23:16
Thank you very much!

That means that Wiki has wrong information:
https://en.wikipedia.org/wiki/Kasparov_versus_the_World

Quotes:

"51... b5?! 52. Kf6+
The bulletin board and Krush now concluded that 52...Kc1 offered the best chances of holding a draw, and tablebases later verified it was both sufficient and necessary"

"52... Kb2?
Tablebases show that Kasparov could have initiated a forced win with 53.Qe4, but the win is so deep that he failed to spot it."

Both are wrong.

I analized this position with Hoffman generator (http://www.freesoft.org/software/hoffman/) and posted some results in "Talk" page in Wikipedia (https://en.wikipedia.org/wiki/Talk:Kasparov_versus_the_World).
You can also report a mistake (if you are interested) to correct Wikipedia.
Up Topic The Rybka Lounge / Test Positions / Kasparov vs World, 1999 endgame

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