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Jorden van Foreest vs Jinshi Bai
World Junior Championship (2015), Khanty-Mansiysk RUS, rd 6, Sep-07
Sicilian Defense: Paulsen Variation (B46)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Dec-23-16
Premium Chessgames Member
  scormus: nothing for me today. I was blocked by noticing ... Qxe5 a few moves on. Only when I played it through I realised it would be followed by Rh8#
Dec-23-16  WorstPlayerEver: <Pseudotsuga>

Yup. That was the point of 20. g4
Make way for the Queen: 22. Be6+ Kh8 23. Rxh7 Kxh7 24. Qh5+

Dec-23-16
Premium Chessgames Member
  whiteshark: b♔: forever alone
Dec-23-16  spyron: what about 25...Kd6? What next for white and how does he win, if he wins?
Dec-23-16  spyron: Answer please!
Dec-23-16  WorstPlayerEver: 26. Qf6? *trembling hands*
Dec-23-16
Premium Chessgames Member
  drollere: i didn't see the point of g4. there isn't a white move down to 26 that would be different due to a pawn on f5. the calculation had to be that the clear rank would be needed for Q+R to be fatal.
Dec-23-16
Premium Chessgames Member
  whiteshark: <spyron: what about 25...Kd6?> Try <26.Qf6>. ;)
Dec-23-16  spyron: to worst player ever; 26...Rxh8
Dec-23-16
Premium Chessgames Member
  steinitzfan: <spyron> I think 26...Rxh8 is met by Bg8 or Bf7 mate. However, I would need an engine to tell you what happens if Black's king just moved to c6 instead.
Dec-23-16  WorstPlayerEver: 25... Kd6 26. Qf6 Kc6 27. Bd7
Dec-23-16
Premium Chessgames Member
  steinitzfan: <WorstPlayerEver> Yep, that seems to do it. I was expecting a complicated king hunt. And if Black takes the bishop, then his queen gets skewered (if I'm not overlooking something better).
Dec-23-16  WorstPlayerEver: <steinitzfan>

Yes, I looked first at 27. Bd5 Kd5 28. Rh5+ but the Black King escapes to c4. While White has sacrified their Bishop for nothing. Then I noticed it wasn't that complicated.

Dec-23-16  varishnakov: I played 20.RxKP PxR 21.BxP+ K-R1 22.QxP

but then I was so sure this was the correct answer that I only looked at the (terrible) defensive move 22...P-N3, which leads to mate after 23.Q-B6+ R-N2 24.RxP+ KxP 25.Q-R4 mate

instead 22...P-R3 defends everything and black wins easily

Dec-23-16  SandyJames: Hi guys, I don't know where to post this but I'm posting it here - I have Arena 3.5 and in that I can load lots of engines like Rybka, SOS 5.1, ETC

The problem is whenever the machine blunders (it has, twice) it quickly changes sides!!! and then I'm playing the losing side!!

Any idea why this happens? Thank you.

Dec-23-16  wtpy: I went with 21 Qf5 Qd6 22 Qh7 Kf8 23 Qh8 Kf7 24 Qh5 Kf8 25 Qg6 threatening Rh8 mate. If... Rf7 26 Rh8 Ke7 27 Qg5 Rf6 28 Qg7 Rf6 29 Rh7 wins. If instead 24 ..Kg8 25 Qg6 with the plan of Bd3 and Rh8 followed by Qh7 mate; the only defense I saw was black giving up his queen for the bishop on d3, but I could certainly have missed something. Didn't see g4 and couldn't make Re6 work.
Dec-23-16
Premium Chessgames Member
  Jimfromprovidence: You have to look at the difference between playing 20 g4 vs. 20 Rxe6 directly.

If 20 Rxe6, then after 20...dxe6 21 Bxd6+, black can play 21...Kh8,with black now winning.


click for larger view

But with 20 g4 fxg4 21 Rxd6 dxe6 22 Bxd6+, white cannot play 22...Kh8, below, because with the f pawn gone white has a forced mate.


click for larger view

Nevertheless, black had 20...Rf8 as an alternative to 20..fxg4.

He also did not have to play 22...Kf8 as 22..Rxe6 could have been better.

Dec-23-16  RandomVisitor: After 14.Bg3


click for larger view

Komodo-10.1-64bit:

<-0.40/30 14...Kf7> 15.Bd3 Nxg3 16.hxg3 Bxg2 17.Rh5 Bc6 18.Rxc5 Qb6 19.a3 d6 20.Bc4 d5 21.Rd3 Rhc8 22.Rb3 Qd8 23.Bd3 Qd6 24.Ra5 d4 25.Qf4 Qxf4+ 26.gxf4 g6 27.Rxa6 Rxa6 28.Bxa6 Rc7 29.Rd3 e5 30.Bc4+ Ke7 31.fxe5 fxe5 32.Rg3 Kd6 33.b4

Dec-23-16  Sniffles: Elegant. Quite well done. Open up the side of the board so the queen and rook can operate the most effectively. When allowed to do so, all blacks pieces and overwhelming strength become sidelined and irrelevant.
Dec-23-16
Premium Chessgames Member
  agb2002: White is one pawn down.

White has several options, Qxf5, Rxe6, Bxe6+, g4, Rhd1, etc.

In the case of 20.Qxf5 Qxd6 21.Qxh7+ Kf7

If 21... Kf8 22.Qg6 Rf7 -22... Kg8 23.Bd3 with the threat 24.Rh8+ Kxh8 25.Qh7#- 23.Rh8+ Ke7 24.Qg5+ Rf6 25.Qxg7+ Rf7 22.Qg5+ Rf6 23.Rh7+ wins.

22.Qf5+ Kg8 (22... Ke8 23.Rh8#) 23.Rh7 (threatens Qh5-Rh8#, however White can repeat moves, 23.Qh7+, etc.) 23... Qxg3 24.b3 Bd5 25.Qh5 g6 (25... g5 26.Qg6+ and mate next) 26.Rh8+ Kf7 27.Qh7+ Kf6 looks winning for Black.

-----

In the case of 20.Rxe6 dxe6 (20... Rxe6 21.Qxc7 wins; 20... Qxe5 21.Rxe5+ Kf8 22.Rxf5+ Ke8 23.Rxh7 followed by 24.Rxc5 wins four pawns) 21.Bxe6+

A) 21... Kf8 22.Rxh7 Rf7 (22... Qxe5 23.Rh8#; 22... Re8 23.Qxc7 and mate next) 23.Rh8+ Ke7 24.Qxc7+ Kxe6 25.Qb6+ Ke5 (25... Kd5 26.Rxa8 and 27.Qb3+ wins) 26.Rxa8 Bxa8 27.Qxb8+ wins.

B) 21... Kh8 22.Qxf5

B.1) 22... g6 23.Qf6+ Rg7 24.Rxh7+ Kxh7 25.Qh4#.

B.2) 22... h6 23.Bc4 Rd8 24.Bd3 Rxd3 and White doesn't seem to have enough compensation for the bishop.

-----

I don't know. I'd probably play 20.g4.

Dec-23-16  WorstPlayerEver: <RandomVisitor>

14. Bg3 Kf7 15.Bd3 Nxg3 16.hxg3 Bxg2 17.Rh5 Bc6 18.Rxc5 Qb6 19.a3 a5 and Black is better according to S8.

-20. Qd4 a4 21. g4 Ra5 22. Rxa5 Qxa5 23. f4 h6 24. Bc4 d5 25. Ba2

-20. b3 Rhc8 21. Be4 d5 22. Bxh7 Rab8 23. g4 e5 24. Qc3 d4 25. Qc4+ Ke7

Dec-23-16  ColeTrane: Great puzzle... The CG engine didn't even see the right moves, much less me.....
Dec-23-16  YouRang: <Jimfromprovidence: You have to look at the difference between playing 20 g4 vs. 20 Rxe6 directly.>

Yes, good explanation. :-)

Dec-23-16  Helios727: If Black had played 26... Kf7 would there still be a quick checkmate or would White have to settle for material gain with 27. Rh7 ?
Dec-23-16  RandomVisitor: <WorstPlayerEver>Thanks for that.

After 19...Re7


click for larger view

Komodo-10.1-64bit:

<+2.60/37 20.g4 fxg4 21.Rxe6 dxe6 22.Bxe6+ Rxe6 23.Qxc7> Bc6 24.fxg4 Bxg2 25.Rh2 Bc6 26.Rf2 Kh8 27.b3 h6 28.Kb2 c4 29.g5 hxg5 30.Qf7 Rh6 31.Qxc4 Re8 32.Qg4 Re5 33.Rf5 Rxf5 34.Qxf5 Rf6 35.Qxg5 Kg8 36.Qe5 Kf7 37.Qc7+ Kg6 38.c4 Re6 39.Qf4 Rf6 40.Qe5 Rf3 41.Qd6+ Rf6 42.Qg3+ Kf7 43.Qc7+ Kg6 44.Kc3 Rf3+ 45.Kd4 Rf6 46.b4

+1.66/37 20.Qxf5 g6 21.Qe5 Rg7 22.Rhd1 Rf7 23.b3 Raf8 24.g4 Bc8 25.Bd3 Bb7 26.Rh1 Rg7 27.a4 Rc8 28.Kb2 a5 29.g5 Bd5 30.Ba6 Bb7 31.Bc4 Rf7 32.Bd3 Kf8 33.Rd1 Kg8 34.Bb5 Bd5 35.c4 Rf5 36.Qh2 Bc6 37.Qh4 Bxb5 38.cxb5 Rf7 39.Qc4 Rcf8 40.b6 Qc8 41.Rh1 Rd8 42.Rh6

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