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Fridrik Olafsson vs Wolfgang Unzicker
Lugano (1970), Lugano SUI, rd 2, Mar-??
Queen's Gambit Declined: Semi-Tarrasch Defense. Exchange Variation (D41)  ·  1-0



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sac: 44.Rxf6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Jun-29-18  mel gibson: I saw the Rook sacrifice immediately but wasn't sure. It took Stockfish 9 over a minute to see it on an i7 quad core:

44. Rxf6

Rxf6 (♖d6xf6 g7xf6 ♕e5xf6+ ♔h8-g8 ♕f6xh6 ♖d8xd7 ♕h6-g5+ ♔g8-f8 h5-h6 ♕b8-c8 ♗c6xd7 ♕c8-b7+ ♔g2-g1 ♕b7xd7 h6-h7 ♕d7-d1+ ♔g1-g2 ♕d1-d4 ♕g5-g8+ ♔f8-e7 h7-h8♕ ♕d4xh8 ♕g8xh8 b6-b5 ♕h8-e5+ ♔e7-d7 a4-a5 ♔d7-c6 ♕e5-f6+ ♔c6-b7 ♕f6-b6+ ♔b7-c8 ♕b6xa6+ ♔c8-c7 ♕a6xb5 ♔c7-d6 a5-a6 ♔d6-e6 a6-a7 f7-f6 a7-a8♕ ♔e6-f7 ♕b5-d7+ ♔f7-g6 ♕a8-g8+ ♔g6-h5 ♕d7-h3+) +M24/50 142)

score for White mate in 24.

Jun-29-18  NBZ: Finally we have a puzzle which is easy for a human to see (the prison theme is really neat) but devilish for a computer.
Jun-29-18  centralfiles: is there a puzzle submit page?
Jun-29-18  WorstPlayerEver: <centralfiles>

Not sure, but you can point to a puzzle in a game by commenting here.

Premium Chessgames Member
  ChessHigherCat: <scholes: SF score of 132.65 is its highest possible score in program. Perhaps you are using tablebases. It means mate is certain but it doesn't know number of moves.>

I just use the integrated version of SF available to CG premium members, so I guess that means it uses table bases. It's true that in the final position in my diagram mate is a virtual certainty unless white is severely brain-damaged.

Premium Chessgames Member
  Jimfromprovidence: Side puzzle:

Here is the position after 44 Rxf6 Qxe5 45.fxe5 gxf6 46.exf6 with white's a pawn removed.

click for larger view

Can black save the game? Black to play.

Jun-29-18  cormier: Notes by Stockfish 8 (minimum 30s/ply) 19... Nh5; better is 19...Qd7 20.h4 Rd8 21.Re7 Qxd6 22.Qxd6 Rxd6 23.Rxa7 Ra5 = +0.15 (37 ply) 20. Qd4 + / = +0.90 (36 ply)
Jun-29-18  centralfiles: Yudasin vs Lenderman, 2004

click for larger view


Premium Chessgames Member
  patzer2: This is an interesting game, worthy of study, in a heavily analyzed and frequently played QGD (D41) opening line.

White's strategy of creating an annoying isolated d-pawn starts with the opening and flows smoothly through a long and difficult middle game, which ends with the neat tactical shot 44. Rxf6! solving today's Friday puzzle.

For an improvement, instead of 15...Nc6 16. d5 ⩲, I prefer the second most popular move 15...Re8 from our Opening Explorer. Two recent examples of play after 15...Re8 = are Black's win with it in Mamedyarov vs Ding Liren, 2018 and White's win against it in M Vachier-Lagrave vs A Giri, 2018.

Aug-20-18  tjshann: When Monday is Friday, look for a Rook sac
Aug-20-18  AugCos: The answer to 44.-Qxe5 is rather subtle.
Just one star for this problem?
Sometime star marks look a bit random.
Premium Chessgames Member
  Penguincw: Yeah I feel bad for those people who see this Friday puzzle have a 1 star, and think "I really need to work on my chess."

I found a Monday puzzle.


click for larger view

Solution: J de Wit vs L Gutman, 1984

Aug-20-18  Huddsblue: This isn't a Monday puzzle, far from it.
Aug-20-18  Delboy: Can anyone recommend an alternative to This site is clearly stuck on autopilot, recycling old puzzles, but with the wrong difficulty rating. I know they suffered a tragic loss, but surely a replacement should have stepped in by now. Autopilot only works until the fuel runs out.
Aug-20-18  sudoplatov: Seems like 44.Rxf6 does it. 44.... gxf6 45.Qxb8 Rxb8, 46. Kf3 and if … Rb3+ then Ke4 and penetrates on the d-file. The Black Rook must stay on the 8-rank so White eats all the Pawns. By going Ke4, the Black Rook is denied the d-file behind the Pawn.
Aug-20-18  AlicesKnight: Been here before; Rxf6 is key. If the P recaptures then Qxf6+ and pawn gains will lead to a win with the Black pieces tied down. If Black exchanges Qs first then the Black K ends up trapped and the White monarch can mop up at leisure.
Premium Chessgames Member
  Dionysius1: It's ok <Delboy>. I don't think the site or this feature runs on fuel. Perhaps we can be patient and enjoy the bracing challenge of not knowing the level of difficulty for a while longer? I'm happy to... I'm glad we still have the POTD without this bell/whistle
Aug-20-18  et1: The page continues to run on auto-pilot. From what I see the daily routines were the following - Player of the Day, Match of the Day, and Puzzle of the Day. Plus links to on going tournaments. I wonder if any of the usual commentators are available to give a hand administrating the site.
Aug-20-18  malt: Thanks <Penguincw> Definitely a Monday POTD.
Aug-20-18  et1: Penguincw - yes that's Monday definitevely ! Thank you !
Premium Chessgames Member
  Jimfromprovidence: Here's a recent Monday puzzle that was pretty good. It's move 32, BLACK to play and win.

click for larger view

The game link is below.
R Vidruska vs O Badelka, 2017

Aug-20-18  Olsonist: Black is all bottled up. So Rxf6 kind of begs itself. I had a little trouble finding Qxh6 but it is certainly within the logic of the position. Black is bottled up and Qxh6 maintains that grip. Then the h pawn advances and it's mate.
Aug-20-18  Alex56171: Very easy? Stockfish 9 on an i7 4 cores took 3 and a half minute to find the winning move!
Premium Chessgames Member
  tpstar: <Alex56171> This puzzle was used on Friday, June 29, 2018 but being replayed today on Monday (Very Easy) as their cycle of puzzles is off since the death of the Webmaster.

<Penguincw> and <Jimfromprovidence> each posted a puzzle at the Monday level.

Aug-20-18  Alex56171: Thank you for the sad information, tpstar!
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