| Nov-20-22 | | Brenin: My choice was 29 ... Rac6, either transposing into the game continuation, or if 30 Kf1 then simply 30 ... Qxb2, and Black's Q-side pawns will win for him. |
|
| Nov-20-22 | | newzild: I also went with 29...Rac6, which is disappointing as I once missed a very similar tactic to the game continuation in an over-the-board encounter. |
|
| Nov-20-22 | | Cheapo by the Dozen: The basic idea was very easy to find.
I thought it was even stronger than it really is, because the only choice I saw for White was 31 Bd3, which leads to an even more horrid endgame than White actually endured. Well, I sort of thought that; when a puzzle this late in the week looks that easy to me, I expect to upon checking find a defense I had overlooked. :) |
|
| Nov-20-22 | | Honey Blend: The problem with 29. ... ♕xe1+ 30. ♕xe1 ♖ac6 is that White has the shrewd in-between 31. ♘f6+!:
click for larger viewIf 31. ... ♗xf6 then h2 will no longer be covered, thus White can play 32. ♕e4. Black can of course play 31. ... ♔xg7 32. ♘h5+ ♔f8 33. ♔f1 ♖c1 in order to end up the exchange ahead, as in the game. 29. ... ♖ac6 is superior as it takes away ♘f6+ and forces ♔f1 or ♗d3 first, then ♕xe1 can be followed by the immediate ♖c1 which was otherwise not possible in the game. |
|
| Nov-20-22 | | Mayankk: Black is up an exchange for a pair of pawns. Its Queen is not really in danger since Rxc1 Rxc1+, Qf1 Rxf1+, gets the Queen back. Plus the Bishop on the back rank is vulnerable in some lines from Rc1+ while the g7 pawn is rather weak and the Knight on the rim at h5 will have to abandon it at some point. All this suggests that a liquidation of major pieces will be to Black's benefit. The only question was if Black should do immediate forced liquidation via 29... Qxe1+ 30 Qxe1 Rac6 or prepare via 29 ... Rac6 first and wait out a move like 30 Bd3 before liquidating. Probably either should work. |
|
| Nov-20-22 | | jrredfield: 29 ... Rac6 for me as well. I had the first two Black moves reversed from the text. I'm currently running the position in Komodo Dragon and so far it considers 29 ... Rac6 and Qxe1+ neck and neck. I'll report back in a while. |
|
| Nov-20-22 | | mel gibson: I picked 29. .. Rac6 but
SF followed the game line:
Stockfish 15 says:
29. .. Qxe1+
(29. .. Qxe1+ (♕c1xe1+ ♕e2xe1
♖a6-c6 ♔g1-f1 ♖c6-c1 ♗b1-d3 ♖c8-c5 ♕e1xc1 ♖c5xc1+ ♔f1-e2 b5-b4 ♗d3-b5
♖c1-c2+ ♔e2-d3 ♖c2xb2 ♗b5xa4 ♖b2xa2 ♗a4-d1 ♖a2xf2 ♔d3-c4 ♖f2xg2 ♔c4xb4
♗e5xg7 ♗d1-g4 ♗g7-e5 ♔b4-b5 ♖g2-f2 ♔b5-c4 ♖f2-c2+ ♔c4-d3 ♖c2-c3+ ♔d3-e4
♖c3-c4+ ♔e4-d3 d6-d5 f5-f6 ♔g8-f8 ♔d3-d2 ♖c4-a4 ♗g4-e2 ♖a4-a2+ ♔d2-e3
♖a2-a3+ ♗e2-d3 ♖a3-c3 ♔e3-e2 ♖c3-b3 ♗d3-f5 ♖b3-a3 ♗f5-d3 ♖a3-a4 ♗d3-f5
♖a4-a6 ♗f5-d3 ♖a6-b6 ♔e2-e3 ♗e5xf6 ♘h5-f4 ♖b6-d6 ♔e3-f3 ♗f6-e5 ♔f3-g4
♗e5xf4) +7.40/45 462)
score for Black +7.40 depth 45.
However when I force Stockfish to use my move it's better: 29. .. Rac6
(29. .. Rac6 30. Kf1 (♔g1-f1
♕c1xe1+ ♕e2xe1 ♖c6-c1 ♗b1-d3 b5-b4 ♘h5-g3 ♖c1xe1+ ♔f1xe1 ♗e5xb2 ♘g3-e2
a4-a3 ♗d3-b1 ♖c8-b8 ♔e1-d2 b4-b3 a2xb3 ♖b8xb3 ♗b1-a2 ♖b3-b4 ♔d2-e3 ♗b2xg7
h3-h4 ♖b4xh4 ♘e2-c1 ♗g7-d4+ ♔e3-e2 ♖h4-h5 ♘c1-d3 ♖h5xf5 ♗a2-c4 ♖f5-g5
♔e2-f3 ♗d4-f6 ♗c4-a2 h6-h5 g2-g3 ♖g5-f5+ ♔f3-g2 ♗f6-c3 ♘d3-f4 ♗c3-d4 ♘f4-d3
♖f5-b5 ♔g2-f3 ♔g8-h8 ♗a2-c4 ♖b5-a5 ♔f3-e4 ♗d4-g7 ♗c4-a2 d6-d5+ ♔e4-f4
♗g7-h6+ ♔f4-e5) -8.00/45 405)
score for White -8.00 depth 45. |
|
| Nov-20-22 | | jrredfield: Still neck and neck after depth = 40:
+7.52 29. ... ♖ac6 30.♗d3 ♕xe1+ 31.♕xe1 ♖c1 32.♔f1 b4 33.♗b5 ♖xe1+ 34.♔xe1 b3 35.axb3 axb3 36.♗d3 ♗xb2 37.♔d1 ♗c3 38.♘g3 ♖a8 39.f6 ♖a1+ 40.♔e2 b2 41.♘f5 ♖e1+ 42.♔f3 ♗xf6 43.g4 d5 44.♘xh6+ ♔xg7 45.♘f5+ ♔f8 46.♘g3 ♖d1 47.♗c2 ♖c1 48.♗f5 ♗e5 +7.50 29. ... ♕xe1+ 30.♕xe1 ♖ac6 31.♘f6+ ♔xg7 32.♗d3 ♖c1 33.♘e8+ ♔f8 34.♕f1 ♖xf1+ 35.♔xf1 ♖xe8 36.♗xb5 ♖b8 37.♗xa4 ♖xb2 38.♗c6 ♖xa2 39.f6 ♗d4 40.f4 ♖b2 41.♔e1 ♗xf6 42.♔f1 ♗d4 43.♗a8 ♔g8 44.♗d5 ♔g7 45.g3 ♔f6 46.g4 ♖h2 47.♗c6 ♖f2+ 48.♔e1 |
|
Nov-20-22
 | | al wazir: 35...Bh2+ 36. Kxh2 Rxf1 would have been better. |
|
| Nov-20-22 | | Chesschronicle22: >o< Aiy, sick game! |
|
| Nov-20-22 | | BxChess: I tossed up between 29....Rac6 and 29...Qxe1. I should have realised that the latter was `the' puzzle solution as many puzzles appear to result from a search of the database for piece sacrifices. |
|
Nov-20-22
 | | An Englishman: Good Evening: Flubbed Thursday, Friday and Saturday, solved Sunday almost instantly--just the usual madness around here. |
|
| Nov-20-22 | | agb2002: Black has a rook for a knight and two pawns.
White would like to play g3.
Black can reach a better ending with 29... Rac6 30.Be4 (to save the bishop: 30.g3 Qxe1+ 31.Qxe1 Rc1 32.Kf1 Rxe1+ 33.Kxe1 Rc1+) 30... Qxe1+ 31.Qxe1 Rc1 32.Kf1 Bxb2 must be winning. |
|
Nov-20-22
 | | Teyss: A move earlier 28...? would have been closer to a Sunday puzzle: we are so focused on the first rank we forget about the f5 Knight. BTW why didn't Black immediately play 28...Rac6? or 28...Qxe1?? (One question mark for the sentence, one for the move.) Because 28...Rac6 (likewise if Qxe1) 29.Ne7+ Kh7 30.f4 (frees the K and attacks the B) Qxe1+ 31.Qxe1 Rc1. And now? 
click for larger view32.g8=Q+! Rxg8 (forced) 33.Qxc1. |
|
| Nov-20-22 | | This games easy: So I am wondering if it's cheating to check the prior move BEFORE working the puzzle? I've started to go back through the games from the beginning. I noticed in this game that checking a few prior moves would have greatly affected my next choice...knowing the queen purposely moved in front of the rook and all. So is that cheating? Thanks in advance to whoever provides clarity |
|
Nov-20-22
 | | chrisowen: Guv it's we quibble jolly z it's xing Qxe1 abridge axled it's Rac6 finish effaced it's eon axiom jig it's heavy ion bob tub Qxe1 dug Rac6 bah... |
|
| Nov-20-22 | | thegoodanarchist: I got it. No one is more surprised than me. |
|
| Nov-20-22 | | Pawn Slayer: I'm surprised Stockfish chooses Qxe1+. It wins, but I think R(a)-c6 is at least as strong. |
|
| Nov-20-22 | | Hercdon: Do we get full credit for Rac6? |
|
Nov-20-22
 | | PawnSac: <This games easy: > no it is not cheating. the point of the puzzle as as much to guess the players plan as finding the best move. When you play the game from the beginning you can follow the winners strategy. after all, he typically had an hour thought invested by move 20. at times the engines will assess another move as stronger that the game move. if someone guesses the best engine choice then of course he should get full credit. If you guess the engines 2nd best it is reasonable to award yourself at least half credit. but it's.my opinion that everyone who tries should get SOME credit because the only loser is the one who doesn't try. |
|
| Nov-20-22 | | mel gibson: <Nov-20-22 This games easy: So I am wondering if it's cheating to check the prior move BEFORE working the puzzle?> I don't think so - I normally do that to
get some context about the game. |
|
Nov-21-22
| | al wazir: <This games easy: I am wondering if it's cheating to check the prior move BEFORE working the puzzle?> Yes, it is. Suppose you looked at the *ten* prior moves, or the whole game score up to that point. Suppose you asked the player whose turn it is to move what his plan is. Any information that you can't get by looking at the puzzle position is extrinsic. (In positions where castling is relevant you're entitled to make your answer conditional on whether the king or rook has moved previously, and in endgame studies you're entitled to question whether the 50-move rule is applicable, but you can't get the answers just from the previous move.) |
|
Kibitzing
sac: 29...Qxe1+