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Jessica Mendoza vs Javier Perez Meisegeier
Villa Ballester LV op (2005), rd 5, Jan-11
Sicilian Defense: Closed Variation. Traditional (B25)  ·  0-1
ANALYSIS [x]

FEN COPIED

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sac: 24...Bxg2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Apr-15-15
Premium Chessgames Member
  agb2002: Black is one pawn down.

Black can further weaken the white castle with 24... Bxg2:

A) 25.Kxg2 Qh3+ 26.Kg1 Qh1#.

B) 25.Qe6+ Qxe6 26.dxe6 Bxf1 27.Bg3 (27.Kxf1 Rxf4 - + [R]) 27... Rc4 28.Kxf1 cxb4 with a won ending. For example, 29.Be5 Re8 30.Ke2 Rxe6 31.Kd3 b5 32.Bd4 a6 - + [R+P vs B].

C) 25.Rfe1 Rh1+ 26.Kxg2 Qh3#.

D) 25.Bh2 Bxf1 26.Kxf1 cxb4 - + [R+P vs B].

E) 25.f3 Bxf1 as in E.

Apr-15-15
Premium Chessgames Member
  agb2002: I forgot

F) 25.Bg3 Rh5 (25... Rh1+ 26.Kxg2 Qh3+ 27.Kf3 Rxf1 28.Rxf1 Qxf1 29.Qe6+ and White has perpetual at least) wins the exchange or the queen for rook and bishop.

Apr-15-15  M.Hassan: Black to play and is a pawn down.

24............Bxg2
If the King takes Bishop, it is a mate in two

<25.Kxg2 Qh+ 26.Kg1 Qh1#>

25.Rfe1 Qh3
26.Bh2 Rg4
27.Re3 Bf3+
28.Qg3(forced since g3 square can not be defended with Bishop or it will be a mate on h1)

28........Rxg3+
29.fxg3 Qg2#

White can prolong the game after move 26.

26...........Rg4
27.Qe6+ Kg7
28.Qxg4 Qxg4
29.Re7+ Kf6
30.Re3 Bf3 disc+
31.Kf1 Qg2+
32.Ke1 Qxh2
And Black is ultimately going to win.
Time to review game

Apr-15-15  BxChess: <greed and death, Phony Benoni> Doesn't that line actually lead to a forced mate by white? 31.Qe6+ Kf8 32. Bd6+ Kg7 33. Qe7+ Kh6 34.Bf4+ Kh5 35 Qg5#
Apr-15-15  scormus: Quite a surprise that W played 15 Kxg2?? I think we all (including B) expected Bg3 although that is refuted by a rook zwischenzug attacking the WQ. Best may be 25 ... Re4, where it is conveniently protected by the B and also covering e6. W seems to have nothing better than 26 Kxg2 and B gets Q+p for R+B with continuing initiative as well (... Qg4+ etc).

The engine gives 25 f3 as the best reply, which I never considered. Ceding the exchange straight off but it keeps the WQ in an active for a while at least. There is also to chance B might be tempted to continue an unsound attack on the WK

Apr-15-15  stacase:   Wham bam thank you mam!

This was a Tuesday or maybe even Monday offering.

Apr-15-15
Premium Chessgames Member
  Once: It's our old friend, the GOOT (Get Out of That). 29...Bxg2 is a non forcing move which sets White a lot of problems but does not force his next move. This means that we need to tread carefully. We have to analyse each White response to make sure he doesn't have a refutation.

With Fritz's help, these seem to be the main options:

25. f3 Bxf1 - winning the exchange and a pawn. That is also a viable line against another other non-threatening move by White, such as 25.Qe3 and Bh2.

25. Qe6+ Qxe6 26. fe Bxf1 - the same exchange and pawn.

25. Bg3 (Phony's move) Re4 26. Kxg2 (giving up queen for rook and bishop) Rxe5 27. Bxe5 Qg4+ 28. Bg3 Qe4+ 29. Kg1 Qxd5


click for larger view

Fritz has White ahead by more than +3, but those connected White rooks might take some subduing.


click for larger view

That is pretty tough for a Wednesday. I certainly didn't see it in human mode.

I wonder ... is CG setting the difficulty level by looking only at the main variation (ie what was played) and not looking at how tricky the sidelines are?

Apr-15-15  morfishine: I had <24...Bxg2> and actually "found" 25.Bg3, but then inexplicably attacked the White Queen the wrong way with <25...Rh5> (instead of 25...Re4)

At least it looks like Black wins the exchange after 26.Qe6+ Qxe6 27.dxe6 Bxf1

I never considered a White defense based on 25.f3 and also agree entirely with <Once>'s sentiments

*****

Apr-15-15  scormus: <Once> I also wonder about how CG sets the difficulty level, and you may well be right. However, today would seem rather easy based only on the moves played. Maybe they look also(?) at what their engine just gives as the best line. In any case, on yesterday's evidence (and I think last Tuesday as well) they do not seem to look at alternatives.

Either way it's avery blinkered way for CG to decide on the level. Your engine+interface seems to offer up alternatives and rank them, surely CG ought to be able to do as well.

Apr-15-15  scormus: <morfishine ... attacked the White Queen the wrong way with <25...Rh5> Perhaps an inaccuracy, it's still giving a clear advantage.

<Once .... the 2WRs> yes, the +3 eval is a bit deceptive. I had a similar "winning" position in a recent internet game, and they certainly did take some subduing. I found it difficult to make progress until I forced the exchange of one of them.

Apr-15-15  TheaN: Wednesday 15 April 2015 <24....?>

Black is down a pawn in an opposite bishop middlegame. Two of black's pieces are aimed at the white king, a third can soon follow. Only one white piece forms some defense. Of these pieces the black bishop is en prise and the black doesn't have much scope. The white pieces are centralized, ready to play their part on the black kingside. This suggests <24....Bxg2!>.

A) <25.Bh6? Rh1+ 26.Kxg2 Qh3# 0-1> is black's major threat. Bxf1 is the other one.

B) <25.Kxg2? Qh3+ 26.Kg1 Qh1# 0-1> just changes direction to that mate in two.

There are a couple of ways white can protect himself against mate, but it will at least lose the exchange:

C) <25.Qe6+?!> might possibly create a difficult endgame for black. As this loses a tempo on both sides white loses at least the exchange: <25....Qxe6 26.dxe6 Bxf1> 27.Kxf1 Rh1+ <27.Bg3 Re4 28.Kxf1 Rxe6 30.bxc5 Rc8 > and black should win this fairly easily.

D) <25.Bg3> tries to complete disrupt the combination by attacking the rook on h4 and creating an escape square on f3, ie 25....Rh1+? 26.Kxg2 Qh3+ 27.Kf3 . By moving the bishop from the 4rd rank white created another weakness. <25....Re4!>. Whilst attacking the queen this protects against Qe6+ which means that after <26.Qd6 Qh3 > black is mating soon.

E) <25.f3> white's most sturdy defense by creating air on f2. Because black has insufficient control over the dark squares, I see nothing better than <25....Bxf1 26.Rxf1 (Kxf1 Rh1+ ) cxb4 27.cxb4 Qd7 > with the idea of Re8 and pressure on d6 etc.

Apr-15-15  TheaN: I slipped up after 25.f3 pretty quickly: 26....cxb4 is definitely not best, and 27....Qd7? is a blunder because of 28.Qf6! forcing black to give back the exchange.

I will still consider this solved, cause OTB I would have put more time after 25.f3 Bxf1 26.Rxf1 to find the best moves (Rh5 being one of them), but there is definitely a lot of play left after 25.f3.

Apr-15-15  CHESSTTCAMPS: White is a pawn up in this opposite-colored bishop ending and appears to have the more active queen. However, black has a rook actively involved in an attack against the white king position and this provides a winning advantage.

Black can go for the jugular with

24... Bxg2!

... and white must lose decisive material to avoid a quick mate:

A. 25.Kxg2? Qh3+ 26.Kg1 Qh1#

B. 25.Rfe1 (and Bg5 and several others) Rh1+ 26.Kxg2 Qh3#

C. 25.Qe6+ Qxe6 26.dxe6 Bxf1 27.Bg3 Re4 wins e6 and black's exchange advantage is more than sufficient.

D. 25.Bg3 Re4 26.Qg5 Bxf1 and the exchange advantage should win.

Apr-15-15
Premium Chessgames Member
  gofer: <Once/Scormus>: Moi Aussi!
Apr-15-15
Premium Chessgames Member
  Penguincw: 24...Bxg2 25.Kxg2 Qh3+ 26.Kg1 Qh1# 0-1. Really? That's it. I saw it pretty quickly (that is, when I realized it was black to move).
Apr-15-15
Premium Chessgames Member
  mike1: hmmm, did somebody come up with an idea why Blacks 23...Bh3 works? 24. gxh3 Qxh3 runs into 25.Qe6+ or?
Apr-15-15
Premium Chessgames Member
  patzer2: Got today's Wednesday puzzle solution 24...Bxg2! only for the game continuation 25. Kxg2? Qh3+ 26. Kg1 Qh1#.

The four strongest defenses to 24...Bxg2! according to Deep Fritz 14 are:

25. Bg3 Re4 26. Kxg2 Rxe5 27. Bxe5 Qg4+ 28. Bg3 Qe4+ 29. Kg1 Qxd5 (-3.10 @ 20 depth)

25. f3 Qh3 26. Bg3 Bxf1 27. Rxf1 Rh5 28. Qe6+ Qxe6 29. dxe6 Re8 30. Re1 Rd5 31. Re4 Rd1+ 32. Kg2 Rd2+ 33. Bf2 cxb4 34. cxb4 Rxa2 (-3.50 @ 20 depth)

25. Qe6+ Qxe6 26. dxe6 Bxf1 27. Bg3 Rc4 28. Rxf1 cxb4 29. cxb4 Rxb4 (-4.36 @ 20 depth)

25. Bh2 Rh5 26. Qe6+ Qxe6 27. dxe6 Bxf1 28. Rxf1 cxb4 29. cxb4 Re8 30. Re1 Rb5 31. Re4 Rb6 32. e7 Kf7 (-4.39 @ 21 depth).

P.S.: One move earlier White missed the win 24. gxh3! Qxh3 25. Qe6+! (+2.74 @ 20 depth), opting instead for the decisive error 24. Bxf4? Bxg2! .

Black missed an earlier opportunity by not playing 19... Bg4! 20. Rfe1 c4! 21. b3 cxb3 22. axb3 Qd8 23. dxe5 Bxe5 24. c4 Bxf3 25. Qxf3 Qxh4 26. Kf1 Rf8 (-1.31 @ 22 depth)

Apr-15-15
Premium Chessgames Member
  patzer2: <mike1: hmmm, did somebody come up with an idea why Blacks 23...Bh3 works? 24. gxh3 Qxh3 runs into 25.Qe6+ or> Actually, 23...Bh3? doesn't work. It loses to 24. gxh3! Qxh3 25. Qe6+! (+2.74 @ 20 depth, Deep Fritz 14).
Apr-15-15  BOSTER: <mike1: 23...Bh3>. Attractive, but the mistake.
Apr-15-15  Castleinthesky: More like a Monday, a nice clearance puzzle.
Apr-15-15
Premium Chessgames Member
  kevin86: The bishop sacrifice is clear here; white will be mated soon if the bishop is not taken and sooner if it is taken.
Apr-15-15  StevieB: This was so easy I thought I made a mistake. Of course white's game was weak maybe that's why.
Apr-15-15
Premium Chessgames Member
  gawain: White walked straight into the worst outcome, didn't she? I was sure that W would NOT play 25 Kxg2 so I spent some time looking at the alternatives. White should win but it is not as easy as I expected.
Apr-15-15
Premium Chessgames Member
  whiteshark: # attack by destroying the shield

Game Collection: 000_-> Middlegames Opp col Bishops 2

Apr-15-15
Premium Chessgames Member
  Bubo bubo: 24...Bxg2 wins at least a pawn and the exchange, since White must neither capture (25.Kxg2 Qh3+ 26.Kg1 Qh1#) nor sidestep with the rook (25.Rf~ Rh1+ 26.Kxg2 Qh3#), and 25.Qe6+ Qxe6 26.dxe6 Bxf1 27.Bg3 Rc4 is also pointless.

<Edit:> Missed the only serious attempt for White, 25.Bg3. :-(

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