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Keith Henry Burton Allen vs Alexander Donchenko
Isle of Man Masters (2016), Douglas IMN, rd 1, Oct-01
Benoni Defense: Modern Variation (A60)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Nov-06-16  gofer: The <CG> gods are smiling on us again! It's another Queen-Sac-Sunday!

<29 ... Qxf3+!!>

This is not difficult to see, the follow up only has a few options...

30 Kg1/Kh2?? Nxd5 theatening Nxb4 and Nf4 mating

<30 Kxf3 Nxd5>

Again black is threatening Qb4, there seems to be only two choices for white;

a) try to save the queen...

31 Rxd5 Bxd5+
32 Kf4 h6 (threatening 33 g5+ Kf5 34 Be4# )
33 g5 (forced) Re4+ (h4 Re4+ Kf3 Re1+ Kf4 Be5#)
34 Kf3 (forced) Re1+!?
35 Kg4 (forced) h5+ (Kf4 Be5+ mating)
36 Kh4 (forced) Re4+ (Kf4 Be5#)
37 Bf4 (forced) Rxf4+
38 Kg3 (forced) Be5


click for larger view

Now this line looks very interesting black threatens Rg4# and there seems to be a huge range of discovered checks on offer if white tries to play 39 f3 as a defence.

b) give up the queen and try to save the game...

This one seems more likely, but there are at least four ways to try to do this...

31 Qxd6/Qd2/Qa5/Qe1 ...

I would imagine this is the path that white took, but giving back the sacrifice is not a good idea... ...why I hear you ask. "Na7 has gone walk-about!" would be my reply. After the dust settles, or even before it. Na7 is a major weakness. When I looked at first at this POTD I thought that perhaps the solution was a knight trap, then after a piece count I realised that was just bring equality! So, "yes" the knight trap is on offer, but its not the whole solution, first we need to get back our minor piece and then play the knight trap. Its always there... ...just weighting to be used!

~~~

Yep, tooo lazy to work through white's queen sacrifices, but I had the general idea...

Nov-06-16  Viennablue: In the final position, White might try 38. Nxb5 with the idea 38...Nxb5 39.Rd8+ ...Kg7 40.Rd7+ regaining the bishop and ending up with +2p vs LSB. Depending on time situation some hopes might be on the passed a pawn...
Nov-06-16  Rama: I saw the Q-sac followed by N-takes threatening the discovered check, but did not realize fully that the King had lost his retreat to g1/h2 by coming out to f3. What a wonderful position!
Nov-06-16  Pedro.Akcio: Beautiful. I guessed the queen sac, but I just couldn't follow the correct line, it's too complicated for me.
Nov-06-16
Premium Chessgames Member
  paulalbert: Similar to others spotted the first two moves almost immediately as the logical candidates, but certainly could not calculate the follow up variations to prove them as correct.
Nov-06-16  YouRang: Didn't get it, but I liked it!

Basically black gives up a Q+N for a R+B, and in return gets to drag the white king out of his castle and into the open battlefield.

White finds himself suddenly on the bad side of a king hunt, and getting no help from his poorly placed knight on a7, while black's pieces all seem active and coordinated.

Good puzzle.

Nov-06-16  JohnBoy: Like many, I had the first two moves. But after 31.Rd5 I didn't see through to a clear end, figuring that the W king was sufficiently exposed to justify the effort.
Nov-06-16  RandomVisitor: After 29...Qxf3+ 30.Kxf3 Nxd5:


click for larger view

Komodo-10.1-64bit:

<-1.94/36 31.Rxd5 Bxd5+ 32.Kf4> Rb7 33.Bh2 Rf7+ 34.Kg3 Rf3+ 35.Kg2 Rb3+ 36.Kg1 Rxb4 37.axb4 Bxb2 38.Nxb5 c3 39.Nd4 Rc8 40.Rd1 Rc4 41.Bf4 Bc6 42.Be3 Ba4 43.Rd3 Rxb4 44.f4 Kg7 45.Kf2 c2 46.Nxc2 Bxc2 47.Rxd6 Bb3 48.Kf3 Bf7 49.h4 Rb3 50.Ke4 Bf6 51.Bd4 Rb4 52.g5 Rxd4+ 53.Rxd4 Bxd4 54.Kxd4 Be8 55.Ke4 Kf7 56.Ke5 Bd7 57.Kd5 Bf5 58.Ke5 Kg7 59.Kd5

-2.16/36 31.Qe1 Ne3+ 32.Ke2 Nc2+ 33.Kd2 Nxe1 34.Rfxe1 Ra8 35.Kc1 Bf3 36.Bxd6 Rb7 37.Bc5 Kg8 38.Rd2 c3 39.bxc3 Bxc3 40.Re3 Bxd2+ 41.Kxd2 Bg2 42.Rg3 Bd5 43.Kc3 Rbxa7 44.Bxa7 Rxa7 45.Kb4 Bc4 46.f4 Kf7 47.Rc3 Kf6 48.Kc5 Ra4 49.Rf3 Ra8 50.Rc3 g5 51.fxg5+ Kxg5 52.Rf3 Kh4 53.Kb4 Ra4+ 54.Kc5 h6 55.Rc3 Ra6 56.Kb4

-6.93/36 31.Qxd6 Nc7+ 32.Qc6 Rxc6 33.Kg2 Ra6+ 34.Kg1 Rxa7 35.Bxc7 Bxb2 36.Rd7 Raa8 37.Bb6 Bc6 38.Rd6 Bf3 39.Rb1 Be5 40.Bd4 Bxd4 41.Rxd4 Rxa3 42.Kh2 Bc6 43.Rd6 Rc8 44.Re1 c3 45.Rd4 c2 46.Rc1 Bf3 47.Rb4 Rc5 48.Rb2 Be4 49.Rb4 Bd5 50.Rd4 Rac3 51.Kg1 Bc6 52.Kf1 Rxh3 53.Ke2 Kg7 54.Rd3 Rh2 55.Rd4 h6

Nov-06-16  devere: The queen sac is both pretty and pretty obvious. Nice game, but not a very difficult problem.
Nov-06-16
Premium Chessgames Member
  agb2002: Black is one knight down.

The bishop on b7 x-rays the white king. This suggests 29... Qxf3+ 30.Kxf3 (else 30... Nxd5 wins a piece) 30... Nxd5:

A) 31.Rxd5 Bxd5+ 32.Kf4

A.1) 32... Re4+

A.1.a) 33.Kf3 Re5+ 34.Kf4 Bh6+ 35.g5 Bxg5+ 36.Kg4 h5#.

A.1.b) 33.Kg5 h6+ 34.Kxg6 (34.Kh4 Bf6#) 34... Re6+ (34... Bf7+ 35.Kxf7 Kh7 36.Qxb5 + -) 35.Kh5 (35.Kf7 Rb7#; 35.Kf5 Rf6#) and I don't know how to continue the attack.

A.2) 32... Bh6+ 33.g5 Re4+ 34.Kf3 Re5+ 35.Kg4 (35.Kf4 Bxg5+ 36.Kg4 h5#) 35... Rxg5+ 36.Kh4 (36.Kf4 Rf5+ 37.Kg4 Bf3+ 38.Kh4 Rh5#) and Black has perpetual at least (36... Rh5+ 37.Kg4 Rg5+, etc.).

B) 31.Qa5 Nf6+ 32.Kf4 Bh6+ 33.g5 Re4+ 34.Kf3 Re5+ 35.Kf4 Bxg5#.

C) 31.Qd2 Nf6+ 32.Qd5 (else as in A.2) 32... Nxd5 wins decisive material.

D) 31.Qe1 Ne3+

D.1) 32.Ke2 Ng2+ 33.Kd2 Nxe1 seems to end up in a very good ending for Black. For example, 34.Rfxe1 Rxe1 35.Kxe1 Bxb2 36.Bxd6 c3 37.Bf4 (due to 37... Rxd6 38.Rxd6 c2) 37... Bxa6.

D.2) 32.Kf4 Ng2+ 33.Kg5 Nxe1 as in D.1.

This is all I can do today.

Nov-06-16
Premium Chessgames Member
  Willber G: I can't see how black forces a win after 31.Qd2
Nov-06-16  RandomVisitor: Just a word about the computer solution... after 29...Qxf3 30.Kxf3 Nxd5:

<-1.94/36 31.Rxd5 Bxd5+ 32.Kf4> Rb7 33.Bh2 Rf7+ 34.Kg3 Rf3+ 35.Kg2 Rb3+ 36.Kg1 Rxb4

Notice how Komodo "sees" that the white queen is vulnerable to capture after Rb7-f7-f3-b3-b4. Kind of amazing.

Nov-06-16  bubuli55: < Nov-06-16 Willber G: I can't see how black forces a win after 31.Qd2 >

31.Qd2 Nc7+ 32.Kf4 Nd6+ 33.Ke3 Nf8+ 34.Kf4 Re4+ 35.Kf3 (if Kg5 mate in 2 with h6+ then Bf6# ) Re5+ 36.Kf4 Ne6#

Nov-06-16
Premium Chessgames Member
  Domdaniel: Beautiful win. I remember playing Keith Allen about 35 years ago, when he was in his teens.

The queen sac is an obvious try in a puzzle context, but not so easy to spot in a game. And even if you do consider it, the calculations would defeat most non-masters. It's fully calculable, but it takes a GM to see that.

Nov-06-16
Premium Chessgames Member
  Willber G: <bubuli55: 31.Qd2 Nc7+ 32.Kf4 Nd6+ 33.Ke3 Nf8+ 34.Kf4 Re4+ 35.Kf3 (if Kg5 mate in 2 with h6+ then Bf6# ) Re5+ 36.Kf4 Ne6#>

Thanks for that, retreating the knight with 31...Nc7 and 33...Nf8 didn't occur to me.

Nov-06-16  bubuli55: < Wilbur G > A sweeter sequence is all N moves.

31.Qd2 Nc7+ 32.Kf4 Nd6+ 33.Ke3 Ng5+ 34.Kf4 Nxh3+ #

All N moves :)

Nov-06-16
Premium Chessgames Member
  Willber G: <bubuli55: A sweeter sequence is all N moves.

31.Qd2 Nc7+ 32.Kf4 Nd6+ 33.Ke3 Ng5+ 34.Kf4 Nxh3+ #

All N moves :)>

Love it! If I'd found Nc7 I might have found the rest. But I didn't. ;)

Nov-06-16  pmukerji: Bubuli55 and Wilbur G: what if 33. QxN and trades the Queen for the N and B. White still comes out ahead, no?
Nov-06-16  pmukerji: I get it...it should be 32...Ne6+ and then it works...I was assuming 32..Nd5+...which I don't think works. Nice puzzle!
Nov-07-16
Premium Chessgames Member
  moronovich: Nice little combo.But it is not necessary to be a GM to spot this.The difficult part is to see it in advance.
Nov-07-16
Premium Chessgames Member
  Willber G: <pmukerji: I get it...it should be 32...Ne6+ and then it works...I was assuming 32..Nd5+...which I don't think works. Nice puzzle!>

Yes, Nd6 was a typo, should be Ne6.

Nov-07-16
Premium Chessgames Member
  Willber G: <moronovich: Nice little combo. But it is not necessary to be a GM to spot this. The difficult part is to see it in advance.>

"I can see the combinations as well as Alekhine, but I cannot get into the same positions." -- SPIELMANN

Nov-07-16
Premium Chessgames Member
  moronovich: <Willber G: <moronovich: Nice little combo. But it is not necessary to be a GM to spot this. The difficult part is to see it in advance.> "I can see the combinations as well as Alekhine, but I cannot get into the same positions." -- SPIELMANN>

Thanks and good to see you get the point.And I do remember way back when I first saw the Spielmann quote.There is a lot of learning (and rating ;) in there.

Nov-08-16
Premium Chessgames Member
  Domdaniel: <chrisowen> -- <funs von guv nubs doc duck cod cold cud doss u c doot dont dunk von guv chord crud fun >

Y'know, Chris, you used to make sense in a surreal kind of way. But now I think you're just making a kind of Dadaist tone poem ... a chessical ur-sonata.

Nov-17-16  Moszkowski012273: Missed a mate at the end there but hell of a cool position!
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