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| Nov-15-09 | | johnlspouge: Sunday (Insane):
P Peelen vs Fedorowicz, 1990 (37...?) Black to play and win.
Material: Down 2P. The White Kf1 has 1 legal move, on the back-rank. The Black Pf3 and Bh6 (and White Pf2) create a barrier on the 2-nd rank against the White Kf1, indicating long-term back-rank mate threats which burden the White Bc3 and Qd3 with the corresponding back-rank interpositions. Presently, e.g., Qd3 is burdened with preventing 37…Qg2+ 38.Ke1 Qg1# (39.Qf1). With so much control of the course of the game, Black might be able to exchange Qs into a favorable endgame at the right moment. In particular, the central tension might be resolved tactically in favor of Black. The White Kf1 is vulnerable to 37…Qg2+ and 37…Qh3+. The Black Kg8 is secured from check. Throughout the following, White can play the infeasible Qxf3, a clear loss while the Black Q guards Pf3. Candidates (37...): exd4
37…exd4
(1) Acceptance of Pd4 is fatal:
38.Bxd4 [Qxd4 Qg2+ 39.Ke1 Qg1#, demonstrating the burden Qd3 bears] 38…Bd2 (threatening 39…Qg2#)
39.Qxd2 Qg2+ 40.Ke1 Qg1#, again demonstrating the burden. (2) White can refuse Pd4, but must move Bc3 to avoid losing material. Variation (1) exposes the fact that Bc3 bears the burden of protecting d2, to prevent 38…Bd2. 38.Bb4 [or Ba5] [else, White executes Variation (1)]
38…Qg2+ 39.Ke1 Qg1+ 40.Qf1 Qxf1+ 41.Bf5
[I thought that this variation was sufficient to demonstrate a win, but Toga gives the position as a draw. Thus, 38...Be3 is also necessary to the solution.] |
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| Nov-15-09 | | 5hrsolver: I got this one. At first though I did not see the Qf1 defense. I'm still trying to solve yesterdays problem. |
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| Nov-15-09 | | backyard pawn: Okay, no big surprise that I didn't solve the Sunday puzzle. I think the final position is really interesting -- the Bishop moves to f2 where it is seemingly attacked by two pieces and protected by only one, yet it is immune from capture! Magic! |
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Nov-15-09
 | | chrisowen: Sow enough seeds, in this case pawns, and reap what you get. The fed skinned him, there's no piece of the pie to white. It should be a deflection of the queen. Exd4 with thoughts of looking to see Be3 and then he has a crushing attack. |
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| Nov-15-09 | | patzer2: For today's Sunday puzzle solution, Fedorowicz's deflection 37...exd4! is the correct follow-up to a deep winning combination begun with 34...Qg4+! The not so obvious blunder 34. gxh4?? allows Black's 34... Qg4+!  . Instead, as <RV>'s 27-ply Rybka analysis indicates, White with strong play could have defended and held on with 34. h3 =. Back to the Sunday puzzle solution, 37...exd4! deflects or decoys White's Queen or Bishop for a decisive attack on White's helpless King. The tactics involved include deflection or removing the guard with mate threats (e.g. 37...exd4! 38. Bxd4 Bd2! 39. Qxd2 Qg2+ 40. Ke1 Qg1# or 37...exd4! 38. Qxd4 Qg2+ 39. Ke1 Qg1#), a decoy with the threat of a decisive passed pawn (i.e. 38...Be6! 39. fxe3 Qg2+ 40. Ke1 f2+ 41. Kd1 f1Q+ ), and deflection or removing the guard combined with the pin (i.e. 40...Bxf2+ 41. Kd2 QxQ ). P.S: The amazing obstruction tactical possibility after 37...exd4! 38. Bxd4 deserves a diagram: 
click for larger viewProblem: Find Black's move to win after 37...exd4 38. Bxd4. Solution 38...Bd2! when 39. Qxd2 Qg2+ 40. Ke1 Qg1# follows. |
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| Nov-15-09 | | patzer2: <RV> Just curious to know whether your 27-ply Rybka 3 analysis showed 34. Qc8, as suggested by <Jfp>, as a game saving possibility. Fritz 10 evaluates it as 34. Qc8  at 20-ply. |
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| Nov-15-09 | | David2009: After 33...h4 <RandomVisitor>'s suggestion of 34 h3!! is a truly astonishing save. 
click for larger view Peelen v Fedorowicz 34? <Analysis by Rybka 3 : 34.h3 exd4 35.Bxd4 hxg3 36.fxg3 Qxg3+ 37.Qg2 Qe1+ 38.Kh2 Kf7 39.Qf3 Bh6 40.Kg2 Qd2+ 41.Bf2 Qc2 42.h4 Kf6 43.Kg1 Ke7 44.Bd4 Kf8 45.Bf2 Kg8 => Of course, Black has other attacking plans, e.g. after 34 h3 hxg3 35 fxg3 Crafty prefers Qe3+, thus 36 Qf2 Qxe4 37 gxf4 Bh6! 38 Bc1 (38 dxe5 Bxf4 39 Bd4 dxe5 is more difficult to defend)
Qxd5!? (38 ... exd4 also looks very dangerous) 39 dxe5 Qd1+ 40 Qf1 Qd4+ 41 Qf2 dxe5 42 Qxd4 exd4 43 Kf2 Bg7 44 Kf3 Kh6 45 Ke4 Kh6 46 f5+ Kh4 47 fxg6 Kxg6= Crafty link: http://www.chessvideos.tv/endgame-t... Earlier 
click for larger view Peelen v Fedorowicz Black to play ...28?
Who would have thought White is losing this ending? |
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| Nov-15-09 | | Nullifidian: I think this may have been a case of being helped by knowing that there was a good move here. With the position so blocked up, there were relatively few possible moves to evaluate and most of them (moving the queen or bishop) were obviously bad. So that left me with a candidate move of 37. ... ♙exd4. Still, I was glad for the little travel chess board I use to work through these chess problems, because it might otherwise have been difficult to envision the obstructive sacrifice that comes if White responds: 38. ♗xd4 ♗d2!
This threatens mate in one, and White will have to either give up the queen with 39. ♕xf3 or be mated in two: 39. ♕xd2 ♕g2+ 40. ♔e1 ♕h1#
The best move is to retreat the bishop to somewhere safe along the a5-e1 diagonal, so either 38. ♗a5 or ♗b4. In either case, the response is the same, the superb sacrifice 38. ... ♗e3!. Refusing the sac results in mate, so play must continue: 39. ♙fxe3 ♕g2+ 40. ♔e1 ♙f2+ 41. ♔d1 and now Black has the pleasant choice of creating two connected passed pawns with 41. ... ♙dxe3 or promoting outright with 41. ... ♙f1♕+, both of which force White to give up the queen to stave off mate. This was some superb chess from Mr. Fedorowicz. |
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| Nov-15-09 | | WarmasterKron: Actually had the idea of this - found all except the line beginning with Be3 (obviously the key move, but this is much more than I usually get on Sundays!). |
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| Nov-15-09 | | KNIGHTSTALE22: why doesn't 37...BD2 just win outright?! Someone help me out with a bit of Rybka analaysis of BD2. |
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| Nov-15-09 | | Nullifidian: <KNIGHTSTALE22:> <why doesn't 37...BD2 just win outright?! Someone help me out with a bit of Rybka analaysis of BD2.> No need for Rybka. 37. ... ♗d2 fails because of 38. ♗xd2. If White captured with the queen, then it would be mate in two, but by capturing with the bishop 38. ... ♕g2+ 39. ♔e1 ♕g1+ can be parried with 40. ♕f1 and then you'd have given up the bishop for nothing. |
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| Nov-15-09 | | CHESSTTCAMPS: By strict material count, black is down a pawn, but the pawn on f3 collaborating with the black queen is worth more than a minor piece in this position. Black's Bh6 is also ideally placed for attack. My first thought was that this is a real Sunday lollipop, seeing a mate in three with 37... Bd2?? 38.Qxd2?? Qg2+ 39.Ke1 Qg1#. Unfortunately, 38.Bxd2 Qg2+ 39.Ke1 Qg1+ 40.Qf1 would change the outcome to black's considerable distress. Still, this bit of silliness facilitated understanding: the WQ is tied to the defense of f1 and the WB is tied to the defense of d2, as will quickly become apparent. Therefore: 37... exd4!
Considering all defenses beginning from the weakest:
A) 38.Be1? Qg2#
B) 38.Qxe4? Qg2+ 39.Ke1 Qg1#
C) 38.Bxd4? (or Bb2, Ba1, or Bd2) Qg2+ 39.Ke1 Qg1+ 40.Qf1 B(x)d2+ wins the WQ D) 38.Qb5 Qg2+ 39.Ke1 Qg1+ 40.Qf1 Qxf1+ 41.Kxf1 dxc3 wins E) 38.Bb4 (or Ba5) Be3!
Convergence of force towards a weakened enemy king often yields favorable results. 39.Ke1 Qg1+ 40.Qf1 Bxf2+ wins
E.1) 39.fxe3 Qg2+ 40.Ke1 f2+ 41.K-any f1=Q+ wins
Time to verify.... |
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| Nov-15-09 | | Quentinc: This seemed a lot easier than Friday or Saturday. I think I even would have found this one over the board. Maybe with fewer pieces, there are fewer things to confuse me. |
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| Nov-15-09 | | hedgeh0g: Fairly straightforward for a Sunday. 37...exd4 is the beginning of a very nice combination which exploits the weakness of White's back rank. The pawn can be taken neither by bishop (because of ...Bd2) or Queen (because of Qg2-g1#). The threat of ...Bd2 forces the attacked white bishop to remain on the a5-e1 diagonal, which permits the black bishop to invade on e3 (threatening mate with the Queen), forcing White to move his king, since fxe3 Qg2+ Ke1 f2+ followed by ...f1=Q is rape. The rest is pretty elementary. |
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| Nov-15-09 | | RandomVisitor: <patzer2>After 34.Qc8:
click for larger view Rybka 3:
<[-0.06] d=22 34...Qxe4> 35.Qe6+ Kh7 1:29:32 [+0.00] d=21 34...Qe2 35.dxe5 f3 36.Qc1 1:29:32 |
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Nov-15-09
 | | doubledrooks: I found 37...exd4, attacking the bishop on c3 and also protecting e3 to allow the bishop to land there without a queen capture. Therefore, 38. Ba5 Be3 and, as others have so well noted, white is in deep trouble. |
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| Nov-15-09 | | WhiteRook48: found 37...exd4 but changed to 37...Bd2?! |
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| Nov-15-09 | | silentic: Surprisingly,the bishop was a desperado but survived to the finish and then ended the game. |
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| Nov-15-09 | | Quentinc: <David2009: After 33...h4 <RandomVisitor>'s suggestion of 34 h3!! is a truly astonishing save.> How does White continue after the obvious (probably too obvious) 34..hxg3 35 fxg3 fxg3, intending Bh6 - Be3? |
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| Nov-15-09 | | David2009: 34 Qc8! is another excellent defensive resource <RV, Rybka>, since afteer 34 ...Qxe4 35 Qe6+ Kh7
click for larger view
Black is threatening 36 ...f3 and 36...Qb1+ so White looks lost. But White has an amazing
defensive resource which I leave to the interested reader to discover. You can use the Crafty link
in my previous post P Peelen vs Fedorowicz, 1990 to check your solution. I reckon finding it without computer help must be a Wednesday/
Thursday puzzle. I cheated and used Crafty with colours reversed. |
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| Nov-15-09 | | patzer2: <RV> Thanks! Looks like 34. Qc8 = or 34. h3 = would have been good tries for equality, with both certainly being better than 34. gxh4?? |
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| Nov-15-09 | | David2009: <Quentinc: <David2009: After 33...h4 <RandomVisitor>'s suggestion of 34 h3!! is a truly astonishing save.>
How does White continue after the obvious (probably too obvious) 34..hxg3 35 fxg3 fxg3, intending Bh6 - Be3?>
click for larger view Peelen v Fedorowicz QuentinC variation 36? 36 dxe5 seems to hold, e.g. 36 ...Bh6 37 Bd4 and if 37...dxe5!? 38 Bb6 and White has survived. Indeed
Black has to be careful, the Pawns only ending is won for White.
Crafty link to this variation:
http://www.chessvideos.tv/endgame-t... |
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| Nov-15-09 | | Quentinc: Thanks David. |
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| Nov-15-09 | | TheBish: P Peelen vs Fedorowicz, 1990 Black to play (37...?) "Insane"
White is two pawns up, but pawn count doesn't seem critical here, as Black could easily capture one of them straight away, but appears to have much better at first glance. The first thing you should notice is that 37...Qg2+ looks really strong, but that after 38. Ke1 Qg1+ 39. Qf1 there doesn't seem to be much there. At this point I noticed that if White's bishop weren't covering d2, then 39...Bd2+ would win the queen. With that in mind, I found 37...exd4! Now the pawn can't be taken back! If 38. Qxd4? Qg2+ 39. Ke1 Qg1# ends things without a fight, and also 38. Bxd4? Qg2+ 39. Ke1 Qg1+ 40. Qf1 Bd2+ 41. Kxd2 Qxf1 wins the queen for the bishop with an easy win. So... 37...exd4! 38. Bb4
Probably the best try, keeping the bishop on the e1-a5 diagonal (monitoring the d2 square) and hoping for a future Bxd6. Of course not 38. Be1? Qg2# or 38. Bd2? Qg2+ 39. Ke1 Qg1+ 40. Qf1 Bxd2+ winning a whole queen. Okay, we now have a strong pawn on d4, in that it can't be captured. Now what? If we play 38...Qg2+ 39. Ke1 Qg1+ 40. Qf1 and we haven't gained much. Also, 38...Qg2+ 39. Ke1 Be3!? (hoping for 40. fxe3? f2+, queening the f-pawn next move) White simply plays 40. Qf1! defending. But move order is everything! 38...Be3!!
Attacking f2 in advance of the queen coming in at g2, which saves a tempo since we haven't given White any time to prepare Qf1 to defend, i.e. if now 39. Ke1 Black plays 39...Qg1+ in one shot, rather than Qg2+ first. Now: A) 39. fxe3 Qg2+ 40. Ke1 f2+ and 41...f1=Q+ wins easily. B) 39. Ke1 Qg1+ 40. Qf1 Bxf2+! now wins the queen and will mate quickly. The saved tempo saves the day! |
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Nov-15-09
 | | HeMateMe: Fed peels Peelen, huh? this same game appears in the lazlo Polgar chess book, page 447. |
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