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Feb-15-23
 | | FSR: 37.Bxf5 gxf5 (37...Bxf5? 38.Nxf5 gxf5 39.Qg8#) 38.Nxf5 Qh7 (38...Bxf5 39.Qg8#) 39.Nxh6 Qxh6 40.f5 Bf7 41.e6 intending Qe5+ is killing. |
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Feb-15-23
| | FSR: Nailed it! |
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| Feb-15-23 | | jrredfield: I saw 37 Bxf5 and the next several moves were pretty obvious. Both 37 Bxf5 or 37 Nxf5 will do the trick although a later check with the engine prefers the B over the N. White simply has too much firepower on the right side. Black ran out of options after its last stand, the bishop, was trapped. From this point it's mate in 10 for W after 41 ... Nxe6.
click for larger view 42 Qe5+ Ng7 43 Rxg7 Qf6 44 R7g3 Bg6 45 Rh3+ Kg8 46 Rxg6+ Qxg6 47 Rh8+ Kf7 48 fxg6+ Rxg6 49 Rh7+ Rg7 50 Qxg7+ Ke6 |
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| Feb-15-23 | | stacase: Once you see the possible Knight fork at f5, well it just sort of plays itself. |
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| Feb-15-23 | | jrredfield: forgot 51 Qg6# in my mate in 10 line above. |
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| Feb-15-23 | | geeker: Clearly something has to be sacrificed on f5. I went for 37. Nxf5 because it's more forcing, but 37. Bxf5 is slightly better. :-( |
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| Feb-15-23 | | mel gibson: I knew that pawn had to be taken but was it the Bishop or Knight that should do the job? Stockfish 15 says:
37. Bxf5
(37. Bxf5 (♗c2xf5 ♗e6-f7 ♗f5-g4 a6-a5 f4-f5 b5-b4 e5-e6 ♕e7-d6 e6xf7 ♕d6xg3 ♖g2xg3 ♖b6-f6 ♘e3xd5
♖f6xf7 a3xb4 a5xb4 ♘d5xb4 g6-g5 ♘b4-d5 ♖f7-h7 ♖g3-g2 ♖h7-d7 ♗g4-f3 ♘f8-h7
♖g1-a1 ♖d7-f7 ♗f3-g4 ♔h8-g7 ♘d5-e3 ♖f7-b7 ♘e3xc4 ♖b7-c7 ♗g4-e2 ♖h6-h3
♖a1-a3 ♔g7-f6 ♖a3-a6+ ♔f6-e7 ♘c4-e5 ♖h3xc3 ♖g2-f2 ♔e7-f8 f5-f6 ♖c7-c8
♔h1-g2 ♖c8-d8 f6-f7) +9.25/36 372)
score for White +9.25 depth 36.
However if we follow the game's reply of
37...gxf5.
37. .. gxf5
38. Nxf5
(38. Nxf5 (♘e3xf5 ♖h6-g6 ♘f5xe7 ♖g6xg3 ♖g2xg3 ♖b6-b7 ♘e7-g8 ♗e6-f5 ♘g8-f6 ♗f5-e4+ ♘f6xe4
d5xe4 d4-d5 e4-e3 ♖g3xe3 ♖b7-g7 e5-e6 ♖g7xg1+ ♔h1xg1 ♘f8-h7 d5-d6 ♔h8-g7
d6-d7 ♔g7-f6 d7-d8♕+ ♔f6-f5 ♕d8-d5+ ♔f5-f6 ♕d5-e5+ ♔f6-e7 ♕e5-c7+ ♔e7-e8
♕c7-f7+ ♔e8-d8 ♕f7-d7+) +M18/87 262)
White wins _ mate in 18. |
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| Feb-15-23 | | saturn2: Came to 37 Bxf5 gxf5 38.Nxf5 Qh7 39.Nxh6 Qxh6
It is B+N for R+2P. First I overestimated black's defence resources there but then I saw the strong pawn push 40.f5 |
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| Feb-15-23 | | agb2002: The black bishop and the pawn on g6 prevent Qg8#. This suggests 37.Bxf5: A) 37... Bxf5 38.Nxf5 Qh7 (38... gxf5 39.Qg8#) 39.Nxh6 wins decisive material. B) 37... gxf5 38.Nxf5 Qh7 (38... Bxf5 39.Qg8#) 39.Nxh6 Qxh6 40.f5 looks winning (40... Bf7 41.e6 Nxe6 42.fxe6 Rxe6 43.Qg8+ Kh7 44.Rg8). C) 37... Rb8 38.Bxe6, followed by f5, must be winning (38... Nxe6 39.f5 Nf8 40.e6 Rd8 41.Qe5+ Kh7 42.Nxd5). D) 37... Bf7 38.Bc2, followed by f5, should be winning. E) 37... Qf7 38.Bxe6
E.1) 38... Rxe6 39.f5 as above (39... gxf5 40.Qg8+ Qxg8 41.Rxg8+ Kh7 42.R1g7#). E.2) 38... Nxe6 39.Nxd5 is winning.
E.3) 38... Qxe6 39.f5 as above. |
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Feb-15-23
 | | scormus: <goodevans> can't we make the story that we are getting better at solving these puzzles? |
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Feb-15-23
 | | Dionysius1: Being a bit sharper nowadays I gave exf6 e.p. a look in the diagrammed position. But Bxf5 was clearly better. |
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| Feb-15-23 | | saturn2: 9... c4?! and white can build up a pawn center ala Botvinnik. |
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| Feb-15-23 | | eblunt: <Dionysius1:> Being a bit sharper nowadays I gave exf6 e.p. a look in the diagrammed position.
But Bxf5 was clearly better.
I though e.p was only allowed for one move immediately after the 2 square move ? |
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| Feb-15-23 | | ClassZPlaya: I was definitetly on the right track and saw most of the relevant ideas, but I couldn't decide which capture was better on f5: Nxf5 or Bxf5 because in either case the recapture on f5 is not forced. For example after 37. Bxf5 Bf7 38. Bc2 Qh4 39. f5 Qxg3 40. Rxg3 gxf5 41. Nxf5 White is up a pawn with a strong game but maybe Black can hold. After 37. Nxf5 Bxf5 38. Bxf5 the capture gxf5 is STILL not forced. But White still seems to have a good game after 38... Qh4 39. Qf3. I saw most of the game line, but I think Black played an inferior line with the gxf5 capture. So it seems to me that White wins a pawn and gets a good game with either Nxf5 or Bxf5, but Black doesn't have to roll over and die as in the game. What am I missing? |
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Feb-15-23
 | | chrisowen: Gnaw quark shot peck had zulu I v bxf5 act muff gad accord mack bah huff dad dan dug fun bxf5 chug; |
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Feb-15-23
 | | ChessCoachClark: Calling 41. ... Nxe6 slightly better than 41. ... Bxe6 is too superficial. Stockfish 15 evaluates 41. ... Nxe6 as M9 (an improvement on the M10 from SF 11), but 41. ... Bxe6 is M4 at d51: 42. Qe5 Kh7 43. Rg7 Kh8 44. Ra7 Qf6 45. Qxf6#. Also, White had a Battering Ram formation for a while on the g-file that may be called Alekhine's Gun-- interesting! |
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| Feb-15-23 | | Defrogger: Whats the idea behind 14... Rb8 It seems too passive |
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| Feb-15-23 | | Defrogger: Well, Black didn't play well here. Allowed opening of the g-file and Alekhine cannon against his King, pushed the h-pawn and promptly lost it, and had little coordination among the pieces. |
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| Feb-15-23 | | sfm: 
click for larger viewBlack to move, 9.-,?
Making a move like 9.-,c4?! is something we better think more than twice about. With a rock solid White d-pawn, the plan with f3 and e4 simple and strong, and as it came, it effectively and effortlessly won the game. Like below, where White has just played 15.e3-e4, which would not have caused him any headache, and he is clearly better. So Black to move. Playing 15-.dxe5 does not look attractive, giving White a nice mobile pawn center and an open f-file and clear attacking chances. Better 15.-,h6, saving that h-pawn after 16.e5 chases the Nf6 away? In fact it is worse, after 15.-,h6 16.e5 White is already winning, Black never got any real counterplay. 9.-,c4 made it so much easier to be White. Having played Black in similar positions a couple of times has taught me not to take -,c4 easy. Very instructive game! 
click for larger view |
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Feb-15-23
 | | Check It Out: I saw 37. Bxf5 Bxf5 38. Nxf5 Qh7 39. Nxh6 Qxh6 40. f5 and figured that was good enough. |
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| Feb-15-23 | | whiteshark: a model game |
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| Feb-15-23 | | Cheapo by the Dozen: Either move order for the minor piece captures at f5: -- Is easy to analyze as advantageous.
-- Turns out to win big per the engine.
Points include:
-- Recapturing twice obviously gets Black mated immediately.
-- So do lines in which he plays ... Bf7 before moving his queen. |
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| Feb-16-23 | | TheaN: I saw this one yesterday, didn't get to post: after <37.Bxf5> White wins a crucial pawn, given <37....gxf5 38.Nxf5> and the major pieces will invade eventually whilst White attacks Q and R. After <38....Bxf5? 39.Qg8#>. Taking back with the bishop on f5 will win White th exchange in combination with the attack: 37....Bxf5 38.Nxf5 +-. The non-capturing alternatives allow White to retreat the bishop and play f5: tl;dr this doesn't work in the long term. |
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Mar-02-23
| | Dionysius1: <eblunt> You're right, but in the POTD diagram there's no way of knowing f5 hasn't just been played. In a similar way there have been castling solutions where we don't know, in the isolated position, whether a player still has the right to castle. It's part of the fun really :-) |
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Mar-03-23
 | | keypusher: Nice to see games like this. A lot of players (including me) have read a book about Zuerich Candidates (1953) and gotten entirely the wrong impression of Stahlberg. |
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sac: 37.Bxf5