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Aug-27-17
 | | Richard Taylor: Too difficult for me as most of the Sunday ones are. I didn't think the pawns could make it. A very interesting game and well played by White. Very clever play. |
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| Aug-27-17 | | Pseudotsuga: <offramp: A really good endgame, especially from a nineteen year old. I'm puzzled by the <ICCF> in the game's header. It can't be a correspondence game, because it is played out to checkmate, which would waste the price of four bratwurst.>
Not even one bratwurst: conditional moves. |
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| Aug-27-17 | | dumbgai: Silly black actually played this out to mate. |
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| Aug-27-17 | | RandomVisitor: After 50.b7
click for larger viewStockfish_17081107_x64_modern: <1 hour computer time, 8 cores> <+132.60/58 50...Rg8 51.c5> Rf4 52.c6 Rb4+ 53.Kc1 Rf4 54.c7 Rff8 55.Kb2 Kg7 56.a7 Ra8 57.b8Q h5 58.Kc3 Rh8 59.Kd4 h4 60.Qb7 Kf6 61.Qf3+ Kg5 62.Qg2+ Kf4 63.Qh3 Rae8 64.Kc5 Re5+ 65.Kc6 Rh6+ 66.Kb7 Rb5+ 67.Ka8 Rc5 68.c8Q Rxc8+ 69.Qxc8 Rh5 70.Qd7 Kg3 71.Kb7 Rh8 72.Qg7+ Kh3 73.Qxh8 |
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| Aug-27-17 | | morfishine: In any case, a most remarkable game that offers numerous positions for puzzle problems ***** |
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| Aug-27-17 | | offramp: <Pseudotsuga: <offramp: A really good endgame, especially from a nineteen year old.
I'm puzzled by the <ICCF> in the game's header. It can't be a correspondence game, because it is played out to checkmate, which would waste the price of four bratwurst.> Not even one bratwurst: conditional moves.> Hmm. So Halvax wrote,
"75. Kb7.
If now 75...Ke5 or Ke7 or Ke6 or Kd5 then 76. c7. If then ..." etc etc etc.
Seems a bit long-winded. I suspect many corres players might resign a ♔+♕ v ♔ endgame. |
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| Aug-27-17 | | RandomVisitor: The critical position is after 54.c7!
click for larger viewWhite will play b8=Q. Like a bad first-person-shooter video game, if captured the queen will just re-spawn on b8 - twice, first after say c7xb8, then a7xb8. A white queen remains after both rooks are gone. Black is paralyzed after b8=Q, so white just marched the king to b7 and it is game over, insert coin. |
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Aug-27-17
 | | patzer2: For today's Sunday puzzle (50. ?), it's obvious White needs to push one of his passed pawns. But which one? The most likely candidates are 50. b7 or 50. a7. My goal was to get two and then three pawns to the seventh rank and then promote, and I didn't think Black could stop this plan no matter which pawn was pushed first. However, that was a wrong assumption. So I unfortunately picked the wrong pawn push 50. a7?, which, as <agb2002> observes, allows Black to turn the tables and steal the win with 50...Rf8 51. b7 Rgg8 52. c5 Ra8 -+ (diagram below.) 
click for larger viewIn this White to move position (diagram above,) Stockfish 8 indicates it's mate-in-17 for Black. Correct of course is the game move 50. b7! [] which secures the win for White after 50. b7! [] Rf8 51. c5! [] Rgg8 53. c6 [] Ra8 +- (diagram below.)
click for larger viewIn this White to move position (diagram above,) White wins with 54. c7! [] +- (+6.43 @ 36 depth, Stockfish 8.) All other White moves allow Black to steal the win (e.g. 54. Kc1? Rxa6 55. c7 Raa8 56. Kd2 Rac8 -+.) P.S.: Black's first significant mistake, turning the game strongly in White's favor, was allowing a Queen fork which wins a pawn for White after 12...dxe5? 13. Bxg4 Qxg4 14. Qd5 ± (+0.91 @ 32 depth, Stockfish 8.) Instead, Black should play 12...Bxe2 13.Ng6 (13.Qxe2 dxe5 ⩲) 13...fxg6 14.Qxe2 Qe6 15. Kb1 Rae8 = to ⩲ (+0.27 @ 32 depth, Stockfish 8) with a near level position. |
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Aug-27-17
 | | Jimfromprovidence: I tried 50 c5 as well.
Anyway, in that failed try here's a decent derivative puzzle after the line 50 c5 Rff1 51 b7 Rb1+ 52 Kc3 Rg8 53 c6. 
click for larger viewBlack to play and win. |
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Aug-27-17
| | patzer2: The second diagram above, which follows from the winning move 50. b7!, reminds me of the successful Wishbone Triple Option offensive formation developed for the University of Texas football team by Offensive Coordinator Emory Ballard in 1968. The Tripple Option was all the rage among numerous college football programs in the 1970s and even into the 1980s. However, today the triple option is mostly run by the service academies (Air Force, Navy, and Army) and Georgia Tech to give their players an advantage against their usually bigger Division 1A opponents. The wishbone formation possibility after 50. b7! gives Whites three passed pawns a winning advantage against Black's heavy pieces (i.e. the two Rooks) |
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Aug-27-17
| | patzer2: <Jimfromprovidence> The Triple Option formation doesn't always win. In your diagram above, Black wins with 53...Bb6! 54. c7 (54. a7 Rc6+ 55. Kd4 Rcc8) -+ 54...Rc6+ 55. Kb4 Rxc7 56. Kb5 h5 57. Kb6 Rxc2 58. a7 Rb2+ 59. Kc7 Rxb7+ 60. Kxb7 h4 -+. P.S.: Reminds me of how defenses adjusted to the football triple option. By getting fast and strong defenders quickly into the offensive backfield, defensive coordinators found they could disrupt the hand off and pitching options, and slow down the triple option enough to make it less appealing to opposing college football coaches. |
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| Aug-27-17 | | morfishine: Hey, I was right and first
Yipppeeeee!!
***** |
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Aug-27-17
| | patzer2: <Random Visitor> Enjoyed your prose. You write well. In you diagram after 54. c7!, it's worth nothing that if Black tries 54...Rxa7 (diagram below,) 
click for larger viewstronger and much easier than 55. b8=Q Ra8 56. Qb5! +- (+7.61 @ 38 depth, Stockfish 8) is 55. c8=Q +- (+51.13 @ 39 depth, Stockfish 8.) |
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| Aug-27-17 | | morfishine: I am happy that my intuition <50.b7> proved correct vs other tries :) ***** |
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Aug-27-17
 | | Sneaky: This puzzle is not only about why 50.b7 wins, but why all the other seemingly plausible moves don't! Very surprising that this is a "forced-move" situation. |
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Aug-27-17
 | | Fusilli: <offramp: ... I'm puzzled by the <ICCF> in the game's header. It can't be a correspondence game, because it is played out to checkmate.> Or it is and black forced white to make the last 10+ moves out of spite? Is JWC something like Junior World Championship? Anyway, I agree with the general sentiment. This is a jewel of a puzzle. |
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| Aug-27-17 | | Marmot PFL: When I first started going to tournaments I saw a game like this with a master playing white. Some "expert" said white was lost because even if he promoted a pawn he was still down material. Had to ask but what if he promotes two or three pawns? which is just what happened. |
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| Aug-27-17 | | stacase: <patzer2: ...it's obvious White needs to push one of his passed pawns. But which one?
...
So I unfortunately picked the wrong pawn push 50. a7>Ha! I guessed the other (-: |
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| Aug-27-17 | | Altairvega: Three white pawns in the 7th row, the two black rooks in the 8th, the fight will end with one white Queen remained. This Queen will be exchanged with the h black pawn and then white will promote the c2 pawn in to Queen and will win. |
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Aug-27-17
| | pittpanther: Why doesn't black play 57....h2? White can't play c8 because the room captures with check. |
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| Aug-27-17 | | RandomVisitor: After 8.Qd2 black likely has an even game, but play soon gets out of hand. Perhaps black was not using a computer.
click for larger viewStockfish_17081107_x64_modern: <8.5 hours computer time, 8 cores> <+0.17/50 8...c6 9.0-0-0 Re8> 10.Kb1 Nd7 11.Bd3 d5 12.h4 Bc5 13.Bd4 Bxd4 14.cxd4 Nf6 15.Rde1 Ne4 16.Qf4 Qf6 17.Qxf6 Nxf6 18.Kc1 Ne4 19.Nd2 Bf5 20.Bxe4 Bxe4 21.f3 Bg6 22.Nb3 h5 23.Kd2 b6 24.Nc1 Bf5 25.Ne2 g6 26.Nf4 a5 27.a4 Kf8 28.b3 Rxe1 29.Rxe1 Re8 30.Rxe8+ Kxe8 31.g3 Kd7 32.Ng2 Kc7 33.Ne3 Be6 34.g4 Bd7 35.g5 Kd6 36.c3 |
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Aug-30-17
 | | al wazir: <Pseudotsuga: 34...Rxb4+ 35. cxb4 Rxb4+ 36. Ka2> <36. Kc3..<<>>> Of course. I totally missed that. |
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Jun-15-18
 | | GrahamClayton: <offramp>
I'm puzzled by the <ICCF> in the game's header. It can't be a correspondence game, because it is played out to checkmate, which would waste the price of four bratwurst.<offramp>
The game was played in Preliminary Group 2 of the 2nd ICCF Junior World Cup - here is the crosstable: https://www.iccf.com/event?id=28596 |
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| Jun-16-18 | | offramp: <GrahamClayton>, thanks. That link tells me that this game was indeed a correspondence game and that White was rated 2020 and Black 1800. I am still puzzled as to why a correspondence game was played out to checkmate. Perhaps Black was in a bad mood. |
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Jun-18-18
| | GrahamClayton: <offramp>I am still puzzled as to why a correspondence game was played out to checkmate. Perhaps Black was in a bad mood. <offramp>,
I went through all of Ivanova's six losses in the tournament - in all six games she played on till she was checkmated. |
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Kibitzing
sac: 49.Qxf2