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Larry Melvyn Evans vs Wolfgang Uhlmann
Amsterdam IBM (1971), Amsterdam NED, rd 8, Jul-21
King's Indian Defense: Saemisch. Bobotsov-Korchnoi-Petrosian Variation (E81)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 3 ·  Later Kibitzing>
Feb-10-06  notsodeepthought: Nice puzzle - just wondering if it works even with 36 Qf7 first (instead of playing it at move 37 after B:g5).
Feb-10-06  yataturk: got it instantenously except the last two moves which are actually pretty critical...
Feb-10-06  gadfly: Doesn't 36 h4 win as well?
Feb-10-06  dzechiel: Got it in about three minutes. Of course I spotted 36 ♗xg5 right away, that move is obvious. The problem is you can't follow it up with 37 ♕xg5 as the rook hangs.

I wanted to deliver a check on h5 with the queen, so then I thought the first move might be 36 ♕f7 with the threat of 37 ♗xg5. But after looking at that a little longer, I decided I could just sac the bishop and then move the qeen to f7 and the threat would be just as strong.

After that, the king is forced to move to h6 to stop the mate, and then the rook move finishes him off.

Part of finding this for me was realizing that this problem likely had a subtle second move and probably a subtle third move as well.

Feb-10-06  khense: <gadfly> H4 was my candidate. However the actual move works better.
Feb-10-06  PizzatheHut: <gadfly> What would you play after 36...Qf2?
Feb-10-06  dwojiow: <notsodeepthought> I wondered the same thing. I would have played 36.♕f7 which would enable mate by ♕h5 after a Bishop sac. Note that Black can't play ♔h6 with this move order.

That said, I really like the game continuation. The point is Black's rook is hanging, and if he defends it, White plays g4 with mate next. Nice.

Feb-10-06  dwojiow: Er...on second thought, the point is 39.♖e6+ Oops.
Feb-10-06  Fezzik: This was a nice puzzle. Although sacking the Bishop was probably on everyone's mind, finding the quiet moves, Qf7! and Re7! makes this much more challenging! Good job guys!

Btw, it does look as if 36.Qf7! would also have worked just as well.

Feb-10-06
Premium Chessgames Member
  ajk68: It seems 36...Qf2 puts a stopper on things? 36. Qf7 seems stronger. This prevents Qf2.
Feb-10-06  gadfly: <Pizzathehut> 37. Rc3 maybe, but it indeed loks pretty unclear.
Feb-10-06  MrsMurdstone: Groovy. Hadn't seen Evans yet in this puzzle window. I think he won several U.S. championships in the 1950s
Feb-10-06  blingice: Saw the sac but didn't see the continuation.
Feb-10-06  Hongkonger: Curses. Saw Bxg5 immediately but then followed it up with Qxg5 overlooking 37....Qxc7. So close yet so far.
Feb-10-06
Premium Chessgames Member
  Gypsy: Combos like this one remind me of judo.
Feb-10-06  Mattheus: Cool friday puzzle.
Feb-10-06  dkulesh: i just wanted to add that puzzles are a good way to improve your game, not to appraise it. i only get about half the puzzles yet am able to play game like this (5min 3sec) ;Title: Yahoo! Chess Game
;White: colmagmcars@sbcglobal.net
;Black: victorious_dk
;Date: Fri Feb 10 07:01:04 GMT 2006

1. e2-e4 e7-e5
2. g1-f3 g8-f6
3. d2-d4 e5xd4
4. f3xd4 b8-c6
5. b1-c3 c6xd4
6. d1xd4 b7-b6
7. c1-g5 f8-c5
8. d4-e5+ d8-e7
9. e5xc7 h7-h6
10. g5xf6 e7xf6
11. c7-g3 c5-b4
12. f1-d3 a7-a5
13. e4-e5 f6-c6
14. d3-e2 c8-b7
15. e2-f3 b4xc3+
16. b2xc3 c6xc3+
17. e1-e2 b7-a6+

Feb-10-06  tontakal: I think 36. Qf7 wins. The best defense I have found for black is 36. ... Qb8 37. Bxg5 Qf8 38. Be6 Qxf7 39. Rxf7 Kg6 40. Rxg7 Rxg7 41. Bxg7 Kxg7 and white has two pawns more.

But 36 Bxg5 Qf2! seems to stop white's attack...

Feb-10-06
Premium Chessgames Member
  An Englishman: Good Evening: I think 36.Qf7 is an adequate alternate. Both moves seem to leave White with at least a 2-pawn advantage.
Feb-10-06
Premium Chessgames Member
  ganstaman: After 36.Bxg5 Qf2, how about 37.Qf6!

I think black is forced to take to avoid 38.Qf5+ and the king may get trapped in the corner. So 37...Qxf6 38.Bxf6, and now white can force the trade of all remaining pieces and then queen a pawn (advance the b-pawn to distract the black king and then queen the g or h pawn).

I think that 36...Qf2 still loses, but it should take longer.

Feb-10-06  tontakal: Yes. 37. Qf6 does the trick. Now black has to exchange the queens and then rooks and bishops too.
Feb-10-06
Premium Chessgames Member
  ajk68: It seems that the 36. Bxg5 line would be less decisive than 36. Qf7 or 36. Rc6

Also, the line given by tontakal seems to have a better alternative for white than 38. Bf6

38. Qxf8 Rxf8 39. Be7 nets black's d pawn, sets up for control of the queening squares on the b and/or d files, and temporarily keeps the pin on the black bishop.

Feb-10-06  SamuelS: I got the right idea, but could not get it work. The problem was that the rook was hanging. 38. Re7 solves the problem elegantly.
Feb-10-06  Rastus: I saw immediately that both 36. Qxd6 and 36. Qxg5 would be very bad moves!

36...Qf2 is interesting

If 36...Qf2, white can play 37. Bf6. If black's queen takes the bishop white will safely recapture with his queen, as the black bishop will still be pinned to the king by the rook on c7. Black might try for perpetual check but the king escapes. Black also might, after checking the white king, place his queen on g3. In that case, I would probably not try to calculate the quickest variation, I'd try to simply trade off all pieces and and make a new queen, either at b8 or using the pawn majority on the kingside. The black king would be unable to handle both threats. Evans has Uhlmann utterly busted!

Feb-10-06  independentthinker: I saw the sacrifice but discounted it immediately because of the hanging rook. What I liked about this puzzle is that it has added a new theme to my memory now, i.e. maneuvering a piece around a great pin with the intention of mating.

After 37. Qf7, the threat is Qh5# - it's almost like a smothered mate in a sense as the King's extra square doesn't help him.

So black plays 37 .. Kh6, to stop the queen from coming to that square, but then the rook is nicely repositioned with 38 Re7 (threatening Re6+) and black has no defence.

What I have learned is that if I see a King trapped in a corner with a pin on him, I will look for this particular attacking motif, when I would not have looked before.

Great little piece of education - thanks ChessGames!

-Mike

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