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Igor Lutsko vs Sheila Barth Berntsen Sahl
European Club Cup (2007), Kemer TUR, rd 1, Oct-03
Slav Defense: Czech Variation. Classical System Main Line (D19)  ·  0-1



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Kibitzer's Corner
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Apr-28-17  mel gibson: I saw the first move but the rest is not so obvious. The computer says:

24. Ne2 Rxe2 (24. .. Rxe2
(♖e8xe2 ♗d1xe2 ♗c5-g1+ ♔h2-h1 ♘f6-e4 ♕d3-d8+ ♔g8-h7 ♕d8-h4+ ♕e1xh4 ♔h1xg1 ♕h4-f2+ ♔g1-h2 ♕f2xe2 ♗c1-f4 ♕e2xb2 ♖a1-e1 ♕b2-c2 a4-a5 c6-c5 ♖e1-c1 ♕c2-a4 ♗f4-c7 ♕a4-a2 ♗c7-b8 ♕a2xa5 ♖c1-d1 ♕a5-a4 ♖d1-d3 ♕a4-e8 ♗b8-f4 c5-c4) +9.28/18 104)

score for black +9.28 depth 18

Apr-28-17  Walter Glattke: mel Gibson, the Computer is not perfect:
Re8xe2 Bd1xe2 Bc5-g1+ Kh2-h1 Nf6-e4??
error! Bg1-f2+ Kh1-h2 Qe1-g1#
The Server in Seattle can solve this, but a PC with FRITZ normally thinks four moves long correct, and then it is district league niveau.
Apr-28-17  Carlos0012358: 25.Qxe2 was a fatal error that leads to a quick mate. 25.Bxe2 would have extended the game, although eventually white will loose its queen and fold the tent.
Apr-28-17  saturn2: with ..RxNe2 the defender of Bg1+ has to be removed first. 24..Ng4+ ot once does not work because of 25 hxN Qh4+ 26 Qh3 Bd6+ 27 Kh1
Apr-28-17  mel gibson: <Apr-28-17 Walter Glattke: mel Gibson, the Computer is not perfect: Re8xe2 Bd1xe2 Bc5-g1+ Kh2-h1 Nf6-e4??
error! Bg1-f2+ Kh1-h2 Qe1-g1#
The Server in Seattle can solve this, but a PC with FRITZ normally thinks four moves long correct, and then it is district league niveau.>

The computer program I used is Deep Rybka4 64 bit. It's got a higher rating than any human - about 3350 - I think.

Apr-28-17  Walter Glattke: Sorry, I oversaw 25.Bxe2 Bg1+ 26.Kh1 Bf2+!? 27.Bf1!! so possibly 26.-Ne4?? 27.Bf1 (Bf4?? Nf2#) Ne2+ 28.Kxg1 Nxd3 29.cxd3 with a score or nearly 0.00.
Apr-28-17  Walter Glattke: Correction, 27.-Nf2+. Elo 3350 it's impressive.
Apr-28-17  Walter Glattke: Sorry, there is no c-pawn, black wins with Ne4 then.
Premium Chessgames Member
  patzer2: Here's my look at today's Friday puzzle (24...?) and game with the opening explorer, Deep Fritz 15 and Stockfish 8:

<1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5> The game enters a popular mainline of the QGD slav defense (D17).

<6. e3 e6 7. Bxc4 Bb4 8. O-O O-O 9. Qe2 Bg6 10. Ne5 Nbd7 11. Nxg6 hxg6 12. Rd1 Qa5 13. h3 => (0.26 @ 27/40 depth, Stockfish 8) Though this move is seldom played at master level, the computer seems to slightly prefer it.

Other popular tries here include 13. Bd2 as in Kamsky vs Kramnik, 1995, 13. Qc2 as in Karjakin vs J Smeets, 2011 and 13. e4 as in Kasimdzhanov vs Ngoc Truongson Nguyen, 2010.

My personal preference here is 13. Na2 as in White's wins in L Dominguez vs E Najer, 2015 and Kasimdzhanov vs A Deviatkin, 2011.

<13... e5 14. Qc2 exd4 15. Rxd4 Ne5 16. Be2 Rad8 17. f4!?> White enters complications which give Black dangerous attacking opportunities with no risk. Instead, White can maintain calm equality with 17. Bd2 = (+0.14 @ 36 depth, Stockfish 8).

<17...Rxd4 18. fxe5 Qxe5!> This surprise move, sacrficing the Rook for an attacking position, gives Black the advantage of surprise with excellent winning chances if White makes the slightest mistake.

<19. exd4 Qxd4+ 20. Kh1 Qe5 21. Qd3 Re8 22. Bd1?> This is the decisive error. Instead, 22. Bf1 = (+0.07 @ 38 depth, Stockfish 8) gets it back to level for White after 22. Bf1 Nh5 23. Ne2 Re6 24. g3 Qc5 25. Qf3 Rf6 26. Bf4 Nxf4 27. gx4 Qc2 28. Ng3 =.

<22... Qe1+> (-9.25 @ 30 depth, Stockfish 8) Black is now winning.

<23. Kh2 Bc5 24. Ne2>

If 24. Qd2, then Black wins after 24...Qg1+ 25. Kg3 Bd4 26. Bf3 Be5+ 27. Kh4 Bh2 28. Ra3 Re5 29. Ne4 Nxe4 30. Bxe4 Rxe4+ 31. g4 f5 32. Qc3 Rxg4+ 33. hxg4 Qxg4#.

<24... Rxe2!!> This solves the Friday Apr 28, 2017 puzzle.

<25. Qxe2>

If 25. Bxe2, Black wins after 25...Bg1+ 26. Kh1 Ne4 27. Qd8+ Kh7 28. Bf1 Bb6 29. Be3 Qxe3 30. Qh4+ Kg8 31. Bc4 Bc7 32. Rd1 Ng3+ 33. Kh2 Nf5+ (mate-in-six to follow, Deep Fritz 15)

If 25. Qd8+, Black wins after 25...Kh7 26. Bxe2 (26. Be3 Ng4+ 27. hxg4 Bd6+ 28. Qxd6 Qh4+ 29. Kg1 Re1#) 26... Bg1+ 27. Kh1 Bf2+ 28. Bf1 Qxf1+ 29. Kh2 Qg1#.

<25... Ng4+ 26. Qxg4 Bg1+ 0-1> White resigns as it's mate-in-two with 27. Kh1 Bf2+ 28. Kh2 Qg1#.

Apr-28-17  saturn2: <ChessHigherCat it only wins the Q if 25. Qxe2 Bg1+ 26. Kh8 Bf2+ 27. Qxf2 (forced)> 27 Qe2xQe1 (forced, the white queen cannot take the bishop because it is check by the black queen) and it is black who looses the queen.
Apr-28-17  Walter Glattke: I have no Elo 3350, but what happens in
Deep Fritz 15 after 25.Bxe2 ...with 29.Bf4 instead of 29.Be3!? I saw 29.-Qf2 30.Qxb6 axb6 31.Bc7 but black wins, of course.
Premium Chessgames Member
  patzer2: <Walter Glattke> After 25. Bxe2 Bg1+ 26. Kh1 Ne4 27. Qd8+ Kh7 28. Bf1 Bb6 <29. Bf4>, Black wins easy with 29...Qxa1 (Mate-in-21, Stockfish 8 @ 32 depth).
Apr-28-17  Walter Glattke: Cyber intelligence, respect, makes chess more interesting!
Apr-28-17  mel gibson: <Apr-28-17 Walter Glattke: Correction, 27.-Nf2+. Elo 3350 it's impressive.>

Actually it's not quite that high -
this web page says it's rating is 3156.
Still much higher than any human.
Chess engines can still miss some things but
in general they are very hard for even a grand master to beat.

Apr-28-17  mel gibson: And here is a list of rating for all the programs:

DR4 64 bit is number 17 on the list.

Number 1 is Stockfish 8 64 bit with a rating of 3391

Apr-28-17  newzild: I had a different move order:

25. hxg4 Rxe2

Threatening 26...Bg1+, etc.

26. Qxe2 Qh4#

Apr-28-17  Walter Glattke: 24.-Ng4+ 25.hxg4 Rxe2 26.Bxe2 Qh4+
27.Qh3 or 26.-Bg1+ 27.Kh1 Bf2+ 28.Bf1
or 27.Kh3? Bf2 28.Bf4 Qxa1 - White had a bishop more. 26.-Qg1+ 27.Kh3 Bf2 28.Bf4 Qxa1 White wins.
Apr-28-17  Walter Glattke: 26.Bxe2 Bf2 27.Bf1
Apr-28-17  Walter Glattke: 24.Bd2 instead of Nd2!? 24.-Bc7+ 25.g3
Qf2+ 26.Kh1 Bxg3 27.Be2 +
Apr-28-17  Walter Glattke: 27.Qxg3 Qxg3 28.Be2
Apr-28-17  messachess: You need to see 25..Ng4
Premium Chessgames Member
  Richard Taylor: Yes Black can win but White has a tricky defence. Komodo gives ~ +6.20 or so and finds and ingenious win for Black so it is a win but I wonder if Black calculated all the lines? Possibly he overlooked some of White's defensive possibilities as I did. I would still have played it Rxe2 looks as though it leads to a quick mate.

But had White played the more obstructive defense Black may not have found a win and it is possible for White to to draw or lose as Black is a lot of material down.

The Ng4+ idea is beautiful

Premium Chessgames Member
  Richard Taylor: That should be -6.20 in Black's favour...
Premium Chessgames Member
  morfishine: <24...Nh5> is just as effective


Premium Chessgames Member
  fredthebear: <25... Ng4+ 26. Qxg4 Bg1+ 0-1> White resigns as it's mate-in-two with 27. Kh1 Bf2+ 28. Kh2 Qg1#.

This is Max Lange's Mate according to Schiller. The term arose after Anderssen vs Lange, Bratislava 1859. Anderssen vs M Lange, 1859

Another presentation also says it analysis:

Ed Winter investigates Anderssen vs Lange:

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