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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
(44.
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. |
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| 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. |
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| Jun-29-18 | | centralfiles: is there a puzzle submit page? |
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| Jun-29-18 | | WorstPlayerEver: <centralfiles> Not sure, but you can point to a puzzle in a game by commenting here. |
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Jun-29-18
 | | 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. |
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Jun-29-18
 | | 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 viewCan black save the game? Black to play. |
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| 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) |
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| Jun-29-18 | | centralfiles: Yudasin vs Lenderman, 2004
click for larger view29.? |
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Jun-29-18
 | | 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. |
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| Aug-20-18 | | tjshann: When Monday is Friday, look for a Rook sac |
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| 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. |
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Aug-20-18
 | | 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.
19.?
click for larger viewSolution: J de Wit vs L Gutman, 1984 |
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| Aug-20-18 | | Huddsblue: This isn't a Monday puzzle, far from it. |
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| Aug-20-18 | | Delboy: Can anyone recommend an alternative to chessgames.com? 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. |
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| 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. |
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| 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. |
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Aug-20-18
 | | 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 |
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| 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. |
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| Aug-20-18 | | malt: Thanks <Penguincw> Definitely a Monday POTD. |
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| Aug-20-18 | | et1: Penguincw - yes that's Monday definitevely ! Thank you ! |
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Aug-20-18
| | 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 |
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| 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. |
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| Aug-20-18 | | Alex56171: Very easy? Stockfish 9 on an i7 4 cores took 3 and a half minute to find the winning move! |
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Aug-20-18
 | | 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. |
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| Aug-20-18 | | Alex56171: Thank you for the sad information, tpstar! |
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Kibitzing
sac: 44.Rxf6