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Jan2716
  Gregor Samsa Mendel: Very imaginative play by black. Among other things, this game is quite an upseta 2300 beat a 2600. 

Jan2716   dfcx: white prevents black pawn promotion with both rooks guarding the back rank. Black needs to deflect the rook. 33...Rxa2
A. 34.Rxa2 cxd1=Q wins
B. 34.Rac1/Rab1 b3 35.Be3 a4 with 5 connected passed pawns white can't stop the promotion C. 34.Be3 Rxa1 35.Rxa1 b3 and black will promote at least one pawn. For example 36.Bc1 d2 37.Bxd2 b2 38.Rf1 b1=Q 39.Rxb1 cxb1=Q 

Jan2716   jith1207: Got exactly right. I think this ending was possible because of the large number of pawns at disposal in the end. It's like you have a cockroach problem in your house and they keep coming for every kill. Mankind isn't winning the battle in this planet and cockroachdom would not only survive but will also establish as the only living beings in the universe. Just wondering if they are the aliens living among us? 

Jan2716   LoveThatJoker: <33...Rxa2 34. Rac1> (34. Rf1 Rxa1 35. Rxa1 d2 ; 34. Rxa2 cxd1=Q )
<34...b3! 35. Bd4>
(35. Rxd3 b2 36. Rxc2 b1=Q 37. Rxa2?! Qxd3! with a terrific eye for d5) <35...b2 36. Bxb2 cxd1 37.Rxd1 Rxb2 38. Rxd3 b4!> wins for Black. LTJ 

Jan2716
  al wazir: Got it, sort of: 33...Rxa2 34. Rc1 cxd1=Q+ 35. Rxd1 d2 36. Be3 b3 37. Bxd2 Rxd2 38. Rxd2 a4 39. Rb2 b4 40. Kf3 a3 41. Rxb3 a2. 

Jan2716   morfishine: <33...Rxa2> completes the pawnroller One would think that in a relatively short game of 38 moves, surely an improvement for White can be found somewhere ***** 

Jan2716
  agb2002: Black has two pawns for a rook and a bishop.
The rook on a1 is overloaded. This invites to play 33... Rxa2: A) 34.Rxa2 cxd1=Q  + [Q+2P vs R+B]. For example, 35.Rxa5 b3 36.Rxb5 Qc7 37.Bd4 d2, etc. B) 34.Rxd3 Rxa1 35.Be3 c1=Q 36.Bxc1 Rxc1  + [P]. For example, 37.Rc5 b3 38.Rxb5 a4 39.Rb4 a3 40.Rxb3 a2, etc. C) 34.Rdc1 Rxa1 35.Rxa1 d2 36.Rxc2 d1=Q is similar to A. D) 34.Rac1 b3 (34... cxd1=Q 35.Rxd1 d2 36.Be3 looks innecesarily complex) D.1) 35.Bd4 b2 36.Bxb2 Rxb2 and the white rooks can't stop the pawns. D.2) 35.Rb1 cxb1=Q 36.Rxb1 b2 37.Bd4 Ra1 38.Rxa1 bxa1=Q 39.Bxa1 d2 wins. E) 34.Rab1 b3 (an artistic position, both black pawns on the third rank are undigestible) E.1) 35.Be3 a4 followed by a3 looks winning.
E.2) 35.Bd4 b2 36.Bxb2 Rxb2 37.Ra1 cxd1=Q and the linked passed pawns win. E.3) 35.Rf1 d2 wins.
E.4) 35.Rbc1 b2 wins. 

Jan2716   stst: Most interesting first move is to sac R:
33..........Rxa2
IF
(A)34.Rxa2 cxd1=Q and Black has Q vs R, winning
(B)
34.Rdc1 d2
(B1)
35.Rxa2 dxc1=Q same: Q v R for Black
(B2)
35.Rxc2 Rxc2
36.Be3 b3
37.Rd1 b2
38.Bxd2 RxB
39.RxR b1=Q , again Q v R for Black.
Black's Qside pawns will overwhelm White whatever the developments.... 

Jan2716   patzer2: <morfishine> The improvement for White is a win after 31. Rc1! when Deep Fritz 15 indicates play might continue 31...Kxh6 32. Kf1 d3 33. Ke1 b3 34. Kd2 (+6.73 @ 24 depth). Given that 31. Rc1! wins, Black's 29...c2? to (better is 29...Nxc6 =) and 30...cxd4? (better is 29...cd1Q+ to ) could and should have been decisive errors. P.S.: I missed today's Wednesday puzzle, going for instant gratification with the weaker 33...cxd1(Q)? which allows White a strong advantage after 33... cxd1=Q 34. Rxd1 d2 35. Kf3! (+0.90 @ 28 depth, Deep Fritz 15). 

Jan2716
  whiteshark: <33...Rxa2> to extend the irresistable PawnRoller chain. It seems that white can only give his material surplus back only end in a lost ♖endgame 

Jan2716   patzer2: This is a really interesting game. The true exchange sacrifice 24...h6!? (diagram below) click for larger viewcreates huge complications.
Initially, Deep Fritz 15 gives 24...h6!? 25. Bxc6 Bxc6 26. Rd2!? (diagram below) as slightly favorable to White (+0.68 @ 20 depth). click for larger viewHowever, after 26. Rd2!? hxg5 27. Rxe2 gxh4 28. a3 Nd3 29. gxh4 Kg7 30. Kf1 Bf3 31. Rd2 Nf4 = (0.00 @ 20 depth) the computer quickly changes its assessment to fully equally. 

Jan2716
  perfidious: <patzer2....Given that 31. Rc1! wins, Black's 29...c2?....(better is 29...Nxc6 =) and 30...cxd4?.... (better is 29...cd1Q+) could and should have been decisive errors....> Most interesting that the computer evaluation after 29....Nxc6 is equal, for this is a very unbalanced position and (to this human, anyway) looks far from clear, to put it mildly. 

Jan2716   saturn2: I got the first two moves. ...but does not 33...cxRd1 34 Rxd1 Rxa2 also win? The 3 advanced passed pawns on the a and b file look strong enough. 

Jan2716   The Kings Domain: This was quite a toughie. Got it in the last moment, even though I thought about it from the start. :) 

Jan2716   patzer2: <perfidious> Agree the position looks unclear after 29...Nxc6 but it looks even worse after 29...c2? 30. Nxb4 to (+1.59 @ 23 depth, Deep Fritz 15). Playing 29...Nxc6 out movebymove with Deep Fritz 15 to 20 depth per move yielded the drawing line 29... Nxc6 30. Bc1 Rc2 31. Kg2 c4 32. Kf3 d3 33. Be3 Re2 34. Ke4 f5+ 35. Kd5 Nb4+ 36. Kd4 Nxa2 37. Rg1 c2 38. Rxa2 c1=Q 39. Bxc1 Rxa2 40. Be3 Rb2 41. Ra1 a5 42. Rxa5 d2 43. Ra7+ Kg6 44. Ra6+ Kf7 45. Ra7+ Kg6 46. Ra1 Rb3 47. Ra6+ Kh5 48. Bxd2 Rd3+ 49. Ke5 Rxd2 50. f3 c3 51. Kxf5 Rd5+ 52. Ke4 Rc5 53. Kf4 Rc4+ 54. Kf5 Rc5+ 55. Kf4 Rc4+ 56. Kf5 Rc5+ 57. Kf4 = (draw by repetition). No doubt there's room for improvement in this line, as it's very complicated after the exchange sacrifice 24...h6!? 25. Bxc6 Bxc6. 

Jan2716   patzer2: <saturn2: I got the first two moves. ...but does not 33...cxRd1 34 Rxd1 Rxa2 also win?> I thought so when I went for 33...cxRd1? as my Wednesday puzzle solution. But Deep Fritz 15 convinced me I was wrong, as it appears White is close to winning after 33... cxd1=Q 34. Rxd1 Rxa2 35. Rxd3 Rc2 36. Bf8 Rc8 37. Be7 Re8 38. Bxb4 axb4 39. Rd4 b3 40. Rb4 Rb8 41. Rxb3 (+1.61 @ 31 depth). 

Jan2716   CHESSTTCAMPS: In this endgame, white temporarily has the material advantage of B+R for two pawns, but those are very mighty pawns indeed. The maxim "the threat is stronger than its execution" applies here, considering that the blunt force continuation 33...cxd1+? 34.Rxd1 Rxa2? 35.Rxd3 appears to contain black's pawn roller. Tactically much stronger is the immediate 33... Rxa2!
This threatens Rxa1 and leaves the defending rook pair completely helpless: A.34.Rxa2 cxd1=Q 35.Rxa5 b3 36.Rxb5 Qc2 37.Bd4 Qc6+ (or d2) wins easily. B.34.Rxd3 Rxa1 35.Be3 c1=Q 36.Bxc1 Rxc1 and the black pawn roller scores first. C.34.Be3 Rxa1 35.Rxa1 b3 36.Bc1 (36.Bd4 d2) d2 37.Bxd2 b2 wins. D.34.Bd4 Rxa1 35.Rxa1 d2 wins.
Time for review.... 

Jan2716
  thegoodanarchist: for some reason, endgame combinations just don't seem as interesting to me as middle game combos. 

Jan2716   YetAnotherAmateur: The first thing to notice is that cxd1=Q is not good enough, because white responds Rxd1 and hangs on with the extra piece for at least a draw. However, 33. ... Rxa2 is playable, because if 34. Rxa2 cxd1=Q and now white can't recapture. I only get partial credit: I did not see a clear win after 33. ... Rxa2 34. Rc1 b3, which while certainly good for black didn't exactly seem to be a decisive advantage: There was still the extra bishop plus the threat of a kingside pawn push to equalize the promotion chances. 

Jan2716   AvidChessMan: I noticed that the a1 rook was pinned to the first rank, covering d1 against black's d1=Q. This made the a2 pawn vulnerable and increased the pressure on the rooks and aided the onslaught of the black pawns. Not much white could do to improve his position. 

Jan2716
  kevin86: Black's massive queenside stampede will win this one. It just takes a little finesse with the big pieces to pull it off. 

Jan2716
  gawain: Spent a short time looking at this interesting position and concluded that 33...Rxa2 had to be the winning movebut I did not work out any details. 

Jan2716   Gerry84: Instead of 33. Bc5, does rxd3 not help white escape the pin and clear the cd passed pawns? 

Jan2716   CHESSTTCAMPS: <Gerry84> After 33.Rxd3 Rb1 promotes the cpawn. 

Jan2717
  GrahamClayton: The way that Black's pawns march inexorably down the board reminds me of the Space Invaders arcade game! 


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