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Mar2019   Walter Glattke: 33.Kg5 Qxg3# 

Mar2019
  al wazir: What was wrong with 27...Qxc4 ? 

Mar2019   lost in space: The most resilient way to play for white is this 29...Qf2+ 30. Kh3 Qxh2+ 31. Kxg4 h5+ 32. Kf3 Rf6+ 33. Ke3 Qf2+ 34. Kd3 Rf3+ click for larger viewand white is forced to give material to avoid mate: 35. Re3 Rxe3+ 36. Kd4 Rd8+ with a wining position, but it takes a few more preserve moves to haunt the king to death, e.g. 37. Bd5 Rxb3+! 38. Kc4 Qc2+ 39. Kd4 Qc3# 

Mar2019   ChessHigherCat: <al wazir: What was wrong with 27...Qxc4 ?> 28. Rd8+! 

Mar2019
  Jambow: It looks like the win was discovered after the fact by both players. This since Paehtz 28... Rc6 accomplished nothing and the winning continuation is delayed for a move... 

Mar2019   stacase: At first glance 29...Qf2+ looks like it doesn't work as it leads to loss of the Knight (31.Kxg4). But after some looking at other blind alleys, 31...h5+ looks like it leads to a King hunt with maybe a forced mate. By the time 33.Ke5 rolls around, either 33...Qf6+ or 33...Re6+ does indeed force a checkmate. Nice Wednesday puzzle. 

Mar2019
  agb2002: Black has a knight for a bishop and a pawn.
White is about to play Qxc5.
Black can attack the white king with 29... Qf2+ 30.Kh3 (30.Kh1 Qxh2#) 30... Rc5: A) 31.Qd7 Qxh2+ 32.Kxg4 Rg5+
A.1) 33.Kxg5 Qxg3+ 34.Qg4 f(h)6#.
A.2) 33.Kf3 Rxg3+ 34.Kf4 Rh3+ 35.Kg5 (35.Kg4 Qg3#) 35... h6+ 36.Kg4 Qg3#. A.3) 33.Kf4 Qxg3#.
B) 31.Rf1 Rxb5 wins decisive material (32.Rxf2 Nxf2+ 33.Kg2 33.Kh4 Rh5# 33... Nxd1, etc.). C) 31.Re2 Qf3, with the threats Rxb5 and Rh5+, wins. D) 31.Kxg4 Rxb5 32.(B)axb5 Qxh2 looks winning.
E) 31.Qxc5 Qxc5 32.Kxg4 Qxh2 as above. 

Mar2019
  malt: Have 29...Qf2+ 30.Kh3 Q:h2+ 31.K:g4 h5+
32.Kf3
(32.Kf4 Qf2+ 33.Ke5 Qf6+ 34.Kd5 Rd8# )
32...Rf6+ 33.Ke3 Qf2+ 34.Kd3 Rf3+
35.Re3 R:e3+ 36.Kd4 R:b3+ 

Mar2019
  agb2002: The text 30... Qxh2+ is far stronger than my 30... Rc5. 

Mar2019   goodevans: <An Englishman: ... after 26...Qc5, were the next few moves necessary before launching the final attack?> Good question. The first part of the answer lies in <lost in space>'s post: <The most resilient way to play for white is this 29...Qf2+ 30. Kh3 Qxh2+ 31. Kxg4 h5+ 32. Kf3 Rf6+...> So <28...Rc6> is needed for the combo to work otherwise the K reaches safety via f3. But what about <27...Kg7>? Couldn't black have played ...Rc6 a move earlier? The answer is no. The immediate <27...Rc6> would have fallen foul of <28.Bxf7+!>. 28...Kxf7 29.Qb7+ would be bad for black whilst declining the sac allows 29.Qe2, stopping black's attack in its tracks. So as far as I can see, both those intermediate moves were necessary for the attack to succeed. 

Mar2019   rudiment: The first couple of moves jump out but I didn't see 32... Qf2+ or 33... Qf6+. 

Mar2019   SpamIAm: Monika gets Sockoed by Paehtz. 

Mar2019   Walter Glattke: 30.Rc5? 31.Re2 Qf3 32.Qxc5 seems to be not correct, C2) 32.Rxb5 looks draw, 33.Rxf2 Nxf2+ 34.Kg2 Nxd1 35.Bxb5 C3) 32.Rh5+? 33.Kxg4 or 33.Qxh5 Qxe2 34.Qxg4 Qxg4 35.Kxg4 

Mar2019   Walter Glattke: Correction, not 32.Rxb5 or Rh5+, 31.Rxb5 or 31.Rh5+, all one move aarlier. 

Mar2019   Walter Glattke: Oh wonder, 31.Rh5+ instead of 31.Qf3 brings decisive material for black instead of mate, as in the match, by 32.Qxh5 gxh5! 33.Rxf2 Nxf2+ 34.Kh4 Nxd1 35.Kxh5  2 pawns against rook then. 

Mar2019   patzer2: For today's Wednesday puzzle solution, 29...Qh2+! 30. Kh3 Qxh2+ + initiates a winning King hunt. From the final position, 34. Kd5 Rd8# completes a mateinsix. If 32. Kd5, then 32...f6+ 33. Kf4 Qf2# finishes the combination with mateinfive. Stockfish indicate the longest mate occurs after 32. Kf3 Rf6+ 33. Ke3 Qf2+ + (mateineight). P.S.: The decisive error appears to be 24. Rcd1? allowing 24...c4! + (1.60 @ 22 ply, Stockfish 10). Instead, 24. Re2 ∓ to ⩱ improves White's drawing chances. Before 24. Rcd1?, Stockfish indicates 22. Bc4 = with full equality improves over 22. e4 fxe4 ⩱ to ∓. For an early White improvement, I prefer the simple 16. Nxb4 Bxb4 17. b3 ⩲ over the complicated 16. Qc3!? Nxa2 17. Qxa5 Nxc1 18. Re1! =. 

Mar2019   Andrew Chapman: < It looks like the win was discovered after the fact by both players. This since Paehtz 28... Rc6 accomplished nothing and the winning continuation is delayed for a move...>Rc6 enables Rf6, and is also the engine's preferred move. 

Mar2019   dTal: Ialso would have played al wazir's move, 30... Rc5. Think its easily winning as well. 

Mar2019
  wood n tempo: I saw up to 31...Qh5+, but thought the followup was 32...Rf6+, as I failed to see the escape square 33.Ke5. 

Mar2019   landshark: I found this puzzle quite challenging because after the first 2 moves, several branches needed to be resolved, each with its own unique configuration  It took me quite a few bits of time spread out thru the day to work all of it out. As <Lost In Space> pointed out, the toughest defense was 32.Kf3, after which White has to chuck first a rook on move 35, and then by my calculation another rook or the queen, after which I figured  good enough. In all other branches I found mate. 

Mar2019   Cheapo by the Dozen: I had a minor hallucination, going with 30 ... Rc5, because I thought that in all lines where White tried to get both rook and knight for the queen he'd in fact be quickly mated. It turns out that I missed one line where he can pull it off. :) 

Mar2019   zb2cr: A minor improvement to <lost in space>'s line: After 36. Kd4, Rb3+. In this case, no interposition is possible, so White has only two moves. 37. Ke5, Qf6+; 38. Kd5, Rd8+ or 37. Kd5, Rd8+, in both cases with a clear win. 

Mar2019
  drollere: 32. Kf3 is slightly more sport. slightly. 

Mar2019
  Breunor: I was surprised to see that black didn't play 27 Ne3 ch? That looks winning. I was glad to see the computer agrees:
1) 2.14 (24 ply) 28.Rxe3 Qxe3 29.b3 Qxe4+ 30.Kg1 Rc6 31.Qa5 Qe3+ 32.Kg2 Rf6 33.Qe1 Qxe1 34.Rxe1 Rd8 35.g4 Kf8 36.Re5 Rd7 37.Kg3 Re7 38.Ra5 Rd6 39.h4 Rd4 40.Kf3 h6 41.h5 Kg7 42.hxg6 fxg6 43.Ra6 h5 44.gxh5 gxh5 The actual Kg7 gives:
1) 1.47 (32 ply) 28.Bd5 Qc2+ 29.Qe2 Ne3+ 30.Kf3 Nxd1 31.Qxd1 Qxd1+ 32.Rxd1 Rab8 33.Rd2 h5 34.b3 Rc3+ 35.Ke2 Re8 36.Rd3 Rc2+ 37.Rd2 Rxd2+ 38.Kxd2 f5 39.b4 fxe4 40.Ke3 Rc8 41.Kxe4 Rc2 42.Kd4 Rxh2 43.a5 Rd2+ 44.Kc5 Rc2+ 45.Kd4 Rc1 46.b5 Ra1 47.b6 Ra4+ 48.Kc3 Rxa5 49.b7 Rb5 It is interesting that the mating combination does not work on move 27. If black play Qf2 ch on 27 he gets nothing: 1) 0.08 (23 ply) 28.Kh3 Ne5 29.Rf1 Qe3 30.b3 Qh6+ 31.Kg2 Ng4 32.h4 Rxc4 33.bxc4 Ne3+ 34.Kf2 Nxf1 35.Kxf1 Qe3 36.Qd6 Qb3 37.Qd3 Qxa4 38.Kg2 a5 39.Rf1 Rc8 40.c5 Qc6 41.Qd5 Rc7 42.Rc1 a4 43.Qxc6 Rxc6 44.Ra1 Rxc5 45.Rxa4 So why does Qf2ch work on 29 and not on 27? I think it is because the black rook is on c6 on move 29. So in the actual game, if white played 32 Kf3 (instead of Kf4), black wins with Rf6! 1) 13.73 (23 ply) 32...Rf6+ 33.Qf5 gxf5 34.Ke3 Qxg3+ 35.Kd2 fxe4 36.Rf1 Rd8+ 37.Kc2 Rf2+ 38.Rxf2 Qxf2+ 39.Kc1 Rxd1+ 40.Kxd1 e3 41.Be2 Qh2 42.a5 Qd6+ 43.Ke1 Qb4+ 44.Kf1 Qf4+ 45.Ke1 Qh4+ 46.Kd1 Qd4+ 47.Ke1 Qa1+ 48.Bd1 Qxa5+ 49.Kf1 Qf5+ 50.Ke2 Qf2+ 51.Kd3 Qd2+ 52.Kc4 Qxd1 53.Kc3 Qd2+ 54.Kc4 Rf6 is not available if white plays Qf2 on move 27. 30 ..Rc5 was examined. This is good but it isn't over: 1) 1.70 (22 ply) 31.Kxg4 Rxb5 32.axb5 Qxh2 33.Kf3 h5 34.Rh1 Qb2 35.Rd7 Kh6 36.Rxf7 Rd8 37.Bd5 Qd2 38.Rf1 Rxd5 39.exd5 Qxd5+ 40.Ke2 Qxb3 41.R7f3 Qxb5+ 42.Kf2 a5 43.Re1 a4 44.Ree3 Kg5 45.Rf4 Qb2+ 46.Kf1 

Mar2019
  drollere: <the toughest defense was 32.Kf3, after which White has to chuck first a rook on move 35, and then by my calculation another rook or the queen> 30. .. Qxh2+
31. Kxg4 h5+
32. Kf3 Rf6+
33. Ke3 Qf2+
34. Kd3 Rf3+
35. Re3 Rxe3+
36. Kd4 Rxb3+
37. Kd5 Rxb5+
38. Bxb5 Rd8+
39. Kc4 Rxd1 etc.
37. Ke5 Qf4+ also seems to lose Q and R for a R. 


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