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Volha Malatsilava vs Ekaterina Diakonova
World Junior Championship (Girls) (2018), Gebze TUR, rd 5, Sep-08
Sicilian Defense: Hyperaccelerated Dragon (B27)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Oct-14-20
Premium Chessgames Member
  al wazir: White can hold on with 27. Bxe7+ Kxe7 28. Qxg7 Bb5 (28...Bc6 29. Qg5+) 29. Nd5+ Kd7 30. Qxf7+ Kc6 31. Nc3 .
Oct-14-20  Walter Glattke: White threatens Qxg7+ Ke8 Qg8/f8/h8# and 27.-Qxf3 28.Qh8#, hence 27.-Rxb2+

a) 28.Kxb2 Qxc3+ 29.Kc1 Qe1+ 30.Rxe1 fxe1Q#
b) 28.Ka1 Rxa2+ 29.Kb1 Ra1+ 30.Kb2 Qa3#
c) 28.Kc1 (Qxc3? Bxh6? Qh8#) Rxc2+ c1) 29.Kxc2 Ba4+ c2) 29.Qxc2 c3) 29.Kd1 not easy.

d) 28.-e6/28.-e1Q+ 29.Rxe1 Bxh6/Rb1+Kxb1
just find out the best way here

Oct-14-20  geeker: "Thought that White would play 28.Kc1, which offers a swindling chance or two."

Very surprised W didn't play that.

Oct-14-20
Premium Chessgames Member
  agb2002: Black has the bishop pair and a pawn for a bishop and a knight.

White threatens Qh8# and B(Q)xg7+ and mate next.

Black can make the most of the advanced pawn and the b-file with 27... Rxb2+:

A) 28.Kxb2 Qxc3+ 29.Kc1 (29.Kb1 Qa1(b2)#) 29... Qe1+ 30.Rxe1 fxe1=Q#.

B) 28.Kc1 Rxc2+

B.1) 29.Kxc2 Qxc3+ 30.Kd1 Bg4# (30.Kb1 Qb2#).

B.2) 29.Kd1 Bg4+ 30.Kxc2 (30.Ne2 Qd2#) 30... Qxc3+ 31.Kb1 Qb2#.

B.3) 29.Kb1 Qb4+ 30.Kxc2 (30.Ka1 Qb2#) 30... Qxc3+ transposes to B.1.

C) 28.Ka1 Rxa2+ 29.Kb1 Ra1+ 30.Kb2 Qa2# (or Qxc3# or Qa3#).

Oct-14-20  Walter Glattke: B4) was 29.Qxc2. we will find the solution
Oct-14-20  Cheapo by the Dozen: Another fun one. White has dire mating threats, which I couldn't see how to stop except via all-out counterattack. Only after working through that for a while did I realize ... Rxb2+ mates quickly in all variations.
Oct-14-20  nalinw: ??

27 ... Rxb2+
28 Kc1 Rxc2+
29 Qxc2 ???

Isn't there a pawn in the way?

Oct-14-20  Brenin: White should have taken a draw with 27 Bxe7+ Kxe7 28 Qxg7 Bh3 29 Nd5+. Instead she went for mate with 27 Bh6, and duty got mated. For Black there was no reasonable alternative to 27 ... Rxb2+, and one simply had to check that 28 Kc1 (White's only hope of escape) fails after 28 ... Rxc2+, e.g. 29 Kd1 Bg4+ 30 Kxc2 Qxc3+ 31 Kb1 Qb2#.
Oct-14-20  Walter Glattke: Ah, a pawn in the way, I apologize.
Oct-14-20  morfishine: Monday on a Wednesday
Oct-14-20  jokerman: @walter Glattke: 28. Kc1 Rxc2+ 29. Kd1 Bg4+ 30. Kxc2 Qxc3+ 31. Kb1 Qb2# and 28. Kc1 Rxc2+ 29. Kxc2 Qxc3+ 30. Kd1 Bg4#
Oct-14-20  malt: White Threatens Qh8#
Hence 27...R:b2+ 28.Kc1

(28.K:b2 Q:c3+ 29.Kc1 Qe1+ 30.R:e1 f:e1/Q# )
(28.Ka1 R:a2+ 29.Kb1 Ra1+ 30.Kb2 Q:c3# )

28...R:c2+! 29.Kd1

(29.K:c2 Q:c3+ 30.Kd1 Bg4# )
( [30.Kb1 Qb2# )

29...Bg4+ 30.K:c2 Q:c3+ 31.Kb1 Qb2#

Oct-14-20  TheaN: With the White threat of Qh8# or taking on g7, which are not both preventable, Black will have to play the combination to come entirely forced. She could and did.

<27....Rxb2+> creates three distinct answers. Capturing, moving left or moving right. Capturing has the easiest followup, just because it allows an immediate strong check and mate in two after:

A) 28.Kxb2 Qxc3+ 29.Kc1 Qe1+ 30.Rxe1 fxe1Q# and Black's passer ends it.

To the left is just as forcing, but exploiting the opened diagonal may be slightly tougher to spot:

B) 28.Ka1 Rxa2+! 29.Kb1 Ra1+ 30.Kb2 Qa3#. If you really want to claim the pin, Qa2# works too.

So that leaves to the right. Whilst at first glance it seems White may have enough space, the only piece not yet playing part in the combination will end it.

<28.Kc1 Rxc2!> you have to, here. <29.Kb1> Kxc2 transposes as does 29.Kd1 Bg4+ 30.Kxc2 (Ne2 Qd2#) <29....Qb4+ 30.Kxc2 (Ka1 Qb2#) Qxc3+> and now either 31.Kb1 Qb2# or <31.Kd1 Bg4#>.

Nice Sicilian combination.

Oct-14-20
Premium Chessgames Member
  Predrag3141: The fact that b6 was denied the Black queen when Black played 24 ... Qa5 makes a good case for eliminating the d5 knight on move 19 instead of 19 ... Rc4.

White was winning up to 26 Nc3. The better way to protect e1 is 26 Qh4. The strong knight on d5 keeps Whit's attack alive and prevents ... Rb8.

Oct-14-20  King.Arthur.Brazil: Black found a beatiful mate combination started with 27...♖b2+ and I checked every line, and White has no escape. Although, I prefer the resistance long way: 28. ♔c1 ♖xc2+ 29. ♔d1 ♗g4+ 30. ♔xc2 ♕xc3+ 31. ♔b1 ♕b2# However, I guess that White big fail was in move 25.♕h7+?} (It is not such "bad players don't resist to give checks". I guess that all White plan was based on 25. ♗xe7! which threat 26.♕h7# or 26.♘f6+ winning the ♕ at a5. In such case, Black cannot reply 25...♖xe7 2.,♘xe7+ capture also the ♕ at a5. However, there is the sequence 25...♕e1+ 26.♕d1} (not 26...f1=♕? 27.♖xf1 but) 26...♕xe4!, when the White attack collapses, for example 27.♕h5? ♗f5.... Perhaps, the simple 25.c3... Surely, Stockfish can find a better move number 25, for White... lgs
Oct-14-20  get Reti: They say a piece pinned to the king is useless, but in this case, black's pinned bishop is the key to checkmating white's king!
Oct-14-20
Premium Chessgames Member
  doubledrooks: 27...Rxb2+ works for me.
Oct-14-20
Premium Chessgames Member
  Jimfromprovidence: What happens in the same position if there is no f2 pawn? Black to play.


click for larger view

Oct-14-20
Premium Chessgames Member
  eternaloptimist: 27...♖xb2+ is the 1st move that I looked at. It’s obvious that black has to keep checking white’s ♔ til # or white resigns b/c of white’s # threat on black’s ♔. This helped me solve this puzzle. Like <morf> said <Monday on a Wednesday>
Oct-14-20
Premium Chessgames Member
  chrisowen: Probably get in trouble no rb2 facet no?
Oct-14-20  TheaN: <Jimfromprovidence: What happens in the same position if there is no f2 pawn? Black to play.>

Interesting. I wanted to play it out myself on the other website but the engine gave me the 0 evaluation immediately, but it thought that to be the case after

<28....Rxb2+ 29.Kxb2> other answers still lose <29....Qxc3+ 30.Kc1> this is the variation that fails to Qe1+ with f2 on the board, now Black doesn't have better than <30....Qb2+ 31.Kd1 Bg4+ 32.Kd2> 32.Ke1? Qc3+ -#12 apperantly. Bit far to calculate but it doesn't make sense for White to try and escape on the wing she can't escape on as 33.Kf2 Qf3+ 34.Kg1 Qg3+ is <at least> perpetual but Black has time to look for the win, especially if we can win Rh1 with tempo. <32....Qc3+ 33.Kc1 Qb2+ =>.

Interesting twist, but somewhat anticipated :>

Oct-14-20
Premium Chessgames Member
  noads4me: Black has to keep checking to avoid mate in two by white!
Oct-14-20  stacase: <noads4me: Black has to keep checking to avoid mate in two by white!>

BINGO! Didn't put that in my post, but it was certainly part of the thought process.

Oct-14-20
Premium Chessgames Member
  eternaloptimist: <stacase>: I’m willing to bet that <noads4me> got the idea for his kibitz from my kibitz. Although it should be obvious to people that’s the case as long as they observed the position just thoroughly enough to see that (which doesn’t take very long)
Oct-14-20  stacase: <eternaloptimist:> Sometimes when about to be mated, a spite check leads to something neither player noticed, but not usually. But in this case, it's a published puzzle, and 27...Rxb2+ jumps out at you more than it would over the board. But I do think that over the board, I'd have given it a whirl.

Well it's about 15 minutes to Thursday's 10/15/2020 offering. So far this week pinned pieces that can't save the day seems to be a theme of sorts.

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