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Ivan Sokolov vs Georg Mohr
10th Vidmar Memorial (1993), Portoroz, rd 5, Jun-??
King's Indian Defense: Orthodox Variation. General (E91)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Given 6 times; par: 35 [what's this?]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Apr-03-11
Premium Chessgames Member
  keypusher: I spotted 21.Rh8+ quickly enough, but I don't think I would have found White's 22nd in a hundred years. White's concluding manuever, forcing the e-file open and then deflecting the king, is awfully nice too.
Apr-03-11  LIFE Master AJ: I am tired, drove all the way to Montgomery yesterday (3 hours!) for a one-day tournament.

I guessed 21.Rh8+! but did not find the correct follow-up.

Tough problem.

Apr-03-11  Marmot PFL: Missed 22 Qe3 completely. Much of this looks home prepped, and its not surprising that black gets in trouble going in for complications with bad development. White is also taking risks with his king of course.
Apr-03-11  Pensive: In the minute I had to look at this puzzle before heading to church, I looked at 21.Bxg4 exd3+ 22.Kxd3 Rxg4 23.Rch1, preventing the development of Black's knight. I thought there might be a win since two of Black's pieces are paralyzed, but alas, Black can untangle himself and win with his extra piece
Apr-03-11
Premium Chessgames Member
  Penguincw: What a tough puzzle.I didn't even bother to guess it.
Apr-03-11
Premium Chessgames Member
  agb2002: White has a bishop for a knight.

Black threatens 21... exd3+, 21... exf3+ and 21... Rxf3.

The open lines c3-h8 and h1-h8 suggest 21.Rh8+ Kf7 (21... Kxh8 22.Qc3+ and 23.Bxg4 + -) 22.Qc3:

A) 22... exf3+ 23.gxf3

A.1) 23... Qf5 24.Rch1

A.1.a) 24... g5 25.R1h7+ Kg6 26.Q(R)g7#.

A.1.b) 24... Ke7 25.R1h7+ Qf7 26.Rxf7+ Rxf7 (26... Kxf7 27.Rh7+ Ke8 28.Qh8+ Rf7 29.Qg7 + -) 27.Rc8 followed by 28.Qh8 + -.

A.1.c) 24... Qh5 25.Rh7+ is similar to A.1.b.

A.2) 23... Qg5 24.Rch1 Ke7 25.R1h7+ Rf7 26.Rxf7+ Kxf7 27.Rh7+ and mate next.

B) 22... Qg5(f5) 23.Rch1 looks similar to previous lines.

Apr-03-11  BOSTER: <Phony Benoni>
<There are quotes to the effect that GM should defeat IM by blowing them off the board tacticaly...that's talking about games like this>. I don't know such quotes,but if black play without half complete set of chess pieces (without Ra8,Nb8) and white wins,this is not tactics. This is a strategy. This is why white left his king without castle.
Apr-03-11  hedgeh0g: The first move is easy. The follow-up is the key. Anybody who did not see 22.Qe3! cannot give themselves credit for this puzzle.
Apr-03-11  TuxedoKnight: amazing, most of the "insane" puzzles are so hard that even when i go thought the answer, i don't understand 100%...

this one is an exception, i found all the sequence just when i saw the answer

am i getting better? do playing 2 hours online daily, watch puzzles are really making the difference in my game play?

do watching everything in http://tuxedoknight.uphero.com/ is really making me more PRO?

Apr-03-11  cyclon: <hedgeh0g:> Right. F.e. I did NOT solve the CORE of the puzzle which ESSENTIALLY must include the difficult move 22.Qe3!!. My suggestion 22.Rh7+? is in vain and after 22.-Kg8 23.Qc3? misses the advantage by; 23.-exf3+ 24.gxf3 Qxf3+ 25.Qxf3 Rxf3 most likely losing the game WR being also `en prise`. In my view both 21.Rh8+ and 22.Qe3 (if, as it were, 21.-Kf7) must be considered inseparable by NECESSITY making it therefore rather DIFFICULT conception to figure out. In other words, 21.Rh8+!! is only SEEMINGLY "easy" itīs DEEPER (-NOT so easy to find-) meaning emerging in conjunction with 22.Qe3!! in case of 21.-Kf7.
Apr-03-11
Premium Chessgames Member
  agb2002: I missed A.1.d) 24... Qe5+. Better luck next week.
Apr-03-11
Premium Chessgames Member
  sergeidave: Totally missed 29.f4+
Apr-03-11
Premium Chessgames Member
  Gypsy: < hedgeh0g: The first move is easy. The follow-up is the key. Anybody who did not see 22.Qe3! cannot give themselves credit for this puzzle. >

Yes, the opening move is clear. Getting the moves into a right sequence afterward is hard. The hardest thing about latter may be noting the <Qe3> possibility at all. Still, here is a natural sequence of thoughts that lead to a discovery of the power of the <Qe3> theme. It evolves from considering <Rh7+>.

<21.Rh8+ Kf7> This much is immediate because of 21...Kxh8 22.Qc3+... and so on.

Quite plausibly, a queen penetration via <Qc3> may work after the Kf7. But should one play the <22.Qc3> immediately or save it for now and insert <22.Rh7+> first? What are retreats for Black king?

In no particular order, the retreats are <Kf6>, <Ke8>, <Kf8>, and <Kg8>. The first option <22...Kf6? Qc3+> is a clear loser.

The second option <22...Ke8> can surely be foiled by the pin <23.Qe3>.

<<>(Ha! A new, strong move here.)<>>

After the third option <22...Kf8>, one can probably chose between <23.Qc3>, the new <23.Qe3>, or even <23.Rh8+> with the pin idea 23...Ke7 24.Qe3 once again, if Black king tries a new square to avoid repetition.

However, it seems like we have to either repeat, or at least restart after <22...Kg8 23.Rh8+...> because a quiet queen move will not work here.

So, with the draw by a perpetual at hand, let's see if we can change the order and play at least one of the two quiet queen moves (22.Qc3 or 22.Qe3 (!)) to a winning advantage first.

The rest is computing ...

Apr-03-11  WhiteRook48: well, i found the first two moves but then failed
Apr-03-11
Premium Chessgames Member
  Jimfromprovidence: Fantastic puzzle, but where did black go wrong? Was 19 Qd3 a trap, making black react to the threatened g pawn with 19...Qg4+?

Maybe 19...Nd7 was better, freeing up the knight and rook and letting the pawn go.


click for larger view

If white now takes the g pawn, black can double his rooks on the f file.

Anyway, white brilliantly executed his plan of attack.

Apr-03-11  EXIDE: AS a follow up to <DAVID2009>. I have played starting with the position given and cannot extract a win, maybe an end game where the black knight is tied up in front of the rook on the 8th rank is the best that I could come up with.
Apr-03-11  DarthStapler: I got the first move
Apr-03-11  goldenbear: I thought Rh8+ Kf7 22.Bxg4 cxd3+ 23.Kxd3 Rxg4 24.Re1 followed by Re8, but that only gives White a microscopic advantage, insufficient to win.
Apr-03-11  Dupin: I was a bit put off when I saw it was a sunday puzzle with an 'insane' difficulty. Still, the move Rh8+ somehow came naturally to me right away. But I didn't see everything after Kf7 though.
Apr-03-11  David2009: I Sokolov vs G Mohr, 1993 postscript: <EXIDE: AS a follow up to <DAVID2009>. I have played starting with the position given and cannot extract a win> Have you considered activating your forum? - then people can post to you directly.

Crafty End Game Trainer varies from the game defence by playing 23...Qe5 instead of 23...exf3+ to leave


click for larger view

Now White has a brilliant tactic - a Tuesday or Wednesday level puzzle? - which generates what should be a winning material advantage and which I leave you to discover.

Of course the position still has to be won and the EGT continues to makes it difficult. Enjoy finding the tactic and converting it into the win!

Second Crafty link from the diagram position above: http://www.chessvideos.tv/endgame-t...

Apr-03-11  tacticalmonster: Guys I am not bragging here since I did find 22 Qe3! but what is so hard to find about this move?

22 Qe3 is just very logical:
1) exploited the potential half open e-file to attack BK

2) get out of the attack and threatens BQ gaining time

3) attack the f4 rook to tie down the BQ

4) safeguard the WK and WB - it is a move that fits everything to the requirement of the position, period.

Apr-03-11  stst: 21. Rh8+ is natural, so is Kf7 (avoiding Qd4+)
22. Qe3 to protect the B, also keeps the Q for attacking power. But at this point, if Bk really wants to exchange out the Q, it can go PxQ+ 23.PxP QxP+ forcing the exchange.
Whether 24.QxQ or Kf1 or Kd3, both Q will be off, and W has definite advantage, as Bk's R & N are pinned. Yet W has no immediate win.
Apr-03-11
Premium Chessgames Member
  patzer2: <David2009> From your diagrammed position after Crafty's 23...Qe4,


click for larger view

the win I found was 24. R(1)h7+ Kf6 25. Rf8+ Kg5 26. Bxe4! Qxe4 27. Rxf4! Qxe3+ 28. Kxe3 .

Apr-04-11  TheBish: I Sokolov vs G Mohr, 1993

White to play (21.?) "Insane"

I'm pretty sure I got the first move (fairly quickly), but it's the follow-up that might make this on the tough side, though maybe not quite "insane".

21. Rh8+!

The rook is immune from capture, since 21...Kxh8 22. Qd4+ Kg8 removes the white queen from the e4 pawn's "talons", allowing 23. Bxg4 Rxg4 with a gain in material plus attack after 24. Rh1. For this reason, 21...Kg7?? 22. Qd4+ is even worse.

21...Kf7

Now it seems certain that White has at least a draw if he wants it, as Black's king can never go to g7 or f6 as explained earlier, nor can the rook ever interpose or White wins a pawn, i.e. 22. Rh7+ Ke8 23. Rh8+ Rf8 24. Rxf8+ Kxf8 25. Bxg4 exd3+ 26. Kxd3. So we have at least a draw -- need to check if there's a win before we take it.

22. Qe3!

At first I was looking at 22. Qe3 exf3+ 23. gxf3 Qf5 24. Qe8+ Qg7 25. Qg8+ Kf6, and quit looking, thinking that White's attack peters out and the black king can slip out of harm's way. Then I remembered I still have a rook on c1! (Doing this from the diagram.) So in the above line, 26. Qf8+ Kg5 (or 26...Ke5 27. Qe7+ Kd4 28. Qe3#) 27. Rg1+ wins easily. More testing is 22...Qf5, but White wins here too after 23. Rch1! exf3+ 24. gxf3 Qe5 25. R1h7+ Kf6 25. Rf8+ Kg5 26. Rxf4! Qxf4 27. Qe7+ Qf6 28. f4+! Kf5 29. Rf7, pinning and winning.

Apr-04-11  David2009: <patzer2: <David2009> From your diagrammed position after Crafty's 23...Qe4,


click for larger view

the win I found was 24. R(1)h7+ Kf6 25. Rf8+ Kg5 26. Bxe4! Qxe4 27. Rxf4! Qxe3+ 28. Kxe3> You are absolutely right - this also wins. The move I had in mind was 24 Bxe4! seeing 24...Rxe4 25 R1h7+ mating; or 24...Qxe4 25 R1h7+ transposing into your variation. The EGT spoils the party with 24...Nd7 allowing Bxg6+ etc and a pedestrian win which I managed to bungle (!) but won on a later attempt.

On reflection this raises an interesting point: after 24 Bxe4 why does the EGT sacrifice a further Pawn with 24...Nd7 rather than simply play 24...Qxe4 limiting its losses by transposing into your variation? Who knows - the ways of the computer are mysterious, see for example Rybka vs Nakamura, 2008

A tip for those who enjoy playing these endings out against the EGT: save the intermediary positions you reach from time to time so you don't have to start over completely. Visit crafty chessforum.

Another good site for practising endings is www.chesstempo.com - the free basic membership allows you two tries a day at five-man endings.

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