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| Jul-23-10 | | zanshin: <OhioChessFan: 42. Qd3 is easily winning, though the Pawn push is for my money the best move.> I agree and think <dzechiel> was too hard on himself. |
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| Jul-23-10 | | Marmot PFL: White is 2 pawns up with passed pawn on 7th and can pretty much win by brute force- 42 e4 de 43 d5 and if cd 44 Qxh6+, otherwise the passed pawns decide it quickly. |
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| Jul-23-10 | | JG27Pyth: Learned a heap from this one! Thanks once dzechiel et al |
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| Jul-23-10 | | CHESSTTCAMPS: With a two-pawn lead and an f-pawn on the 7th rank with a rook behind it, white would seem to have little to worry about. All that is needed is to check the blockading king on f8 and the game is over. But how? The entry points on the queenside are shut, e.g. 42.Qa8+ Rb8 43.Qa6 Rb2 and white has made no progress. Trying to shift the queen to the kingside invites serious trouble: 42.Qd3(??) Qg3 43.Rg1 (forced) Rf2 (not g4 44.Qh7 wins for white) and the advanced f-pawn falls, and white may lose with the major pieces forced into passive defense. So how does white make progress? Pawn breaks by g or h-pawns are not an option for white, so there is only one logical choice: 42.e4!
The dual threat of 43.ed and e5 forces black to open up a new path for white's queen: A) 42... dxe4 43.d5 e3 44.d6 e2 45.dxc7 exf1=Q+ 46.Qxf1 wins A.1) 43... Qg3 44.Qc8+ Kg7 45.f8=Q+ Kg6 46.Qce8#
A.2) 43... Rg7 44.d6 Qc8 45.Qc4 and the threat of Qxe4 followed by Qh7 can't be met. A.3) 43... cd 44.Qxh6+ mates quickly.
A.4) 44... Qd7 45.Qa8+ wins.
B) 42... Qg3 43.Qc8+ wins.
C) 42... Rg8 43.ed cd 44.Qxh6+ wins
D) 42... Qb7 43.Qxb7 Rxb7 44.e5 wins the ending easily. Time to check... |
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| Jul-23-10 | | Patriot: I saw this thru 44.d6 and wasn't sure how it would end, though 44...Qb7 is an obvious try to maintain control of a8, b8 and c8 since all it takes is a safe check to force f7 thru. The pawn break-thru is a nice way to get a passer OR to lure the c6 pawn away from the sixth rank so that Qxh6+ is possible OR to deflect the black queen away so that a meaningful check is possible on the back rank. The game finish 44...Qb7 45.d7 is pretty slick. 45...Qxd7 46.Qa8+ is deadly. |
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| Jul-23-10 | | David2009: A Riazantsev vs Ni Hua, 2010 White 42? Just as yesterday the first move is easy to see: 42. e4 expecting 42...dxe4 43 d5 and now 43...cxd5?? 44 Qxh6+ wins. If 43...Qg3? 44 Qc8+ wins
so Black is forced to defend with Rb8. White now has d6 picking up either the Pc6 or the Pa5. This looks winning: one can always looks for improvements over
the board. Time to
check:
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I got enough of it. Riazantsev vs Ni Hua 2010, 42? 
click for larger view
Crafty link to the puzzle position above to try out the variations:
http://www.chessvideos.tv/endgame-t... I saw that e4 seemed to win but that 42 Qd3 could be met by 42...Qg3 forcing 43 Rg1 losing back the f7 pawn, so looked no further. This is applying <NM JRousselle> s pragmatic strategy <I tell my students if they see a clear path to victory, take it. It does not have to be the prettiest or the fastest way to victory, just as long as it's a sure way to victory>, just with a different initial choice of "sure path". The trouble with the <sure path> strategy is that sometimes the path turns out not to be sure after all - as I found out with this week's Wednesday and Thursday puzzles. <Patriot> put it well in one or two of his posts. Paraphrasing from memory - if you look at a sacrifice make sure that the sacrifice is likely to work; do more work at critical points in the game. |
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| Jul-23-10 | | eblunt: Well for once I got it this week. I saw 42. ♕d3 ♕g3 43 ♖g1 ♔xf7 44 ♕h7+ at first which wins eventually, but used the old "look for a better one" maxim and saw how blacks c6 pawn is pinned aginst the dangerous h6 checking square , so therefore after the 2 pawn pushes black can't play cxd5, leading to d6 push and black's queen has nowhere to go. |
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| Jul-23-10 | | Rook e2: I think white has at least a Draw with 42. Q a8+ - Rb8 43. Q a6. But there is something better, Q d3 maybe? No because black has the dangerous Qg3. These two ideas combined make the move e4! when black's queen goes to g3, white has the dangerous check now on c8. When black takes the pawn white will get all the open lines with d5 ( okay I didnt spot d5 at first sight but thought e4 was allready the winning move combined with the ideas ). |
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| Jul-23-10 | | kengol: I remember seeing a game many years ago where e4 was the winning move and the player/commenter saying how satisfying it was to make e4 as a winning move, rather than 1.e4......this game reminded me of that. |
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| Jul-23-10 | | kevin86: The answer lies in a pawn sac which leads to a second. The second sac cannot be accepted as the reply is 44 Qxh6+ and queens the f-pawn. |
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Jul-23-10
 | | chrisowen: Dastardliness axle grind race 42.e4 pawn dicks him. Good clubbing the knight of Ni dancing, got know how Alexander's on the raz. 15.Nxd7 also a5 chinese rb8's only file bojangle staple rook and queen. 35..f6 fluffs it down f7 goes fitting end erstwhile. Pawn promotion set gruesome twosome change karma invocating patient culture see hinged 11.c5. |
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| Jul-23-10 | | howlwolf: Jrouselle, I agree Qd3 probably wins, after all white is two pawns up. Are you the JRouselle from New Orleans? I am bill phillips, we played a couple of times in Louisiana; I got to underpromote to a knight in a kings Indian and you were forced to take a draw by perpetual check, one of my more memorable tournament games, of course it was almost thirty years ago. |
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| Jul-23-10 | | jheiner: I saw the main idea fairly quickly, looked at a few lines and then checked. So partial credit but lazy today. One reason the line was clear to me was that I paused to evaluate the entire position before looking at tactical shots. In the immediate Material analysis, the pawn formation jumps out; even more so if you mentally remove the Q's and R's from the board, one sees the 3v2 passed P motif immediately. So there is real value in good habits and full material evaluation on so many of these puzzles. Similarly, the Qg3 threat was immediately obvious upon inspection for threats and checks. With the Qa6 need to stay put, tension on the back rank for Black holds, and the only thing left was to start shoving pawns. So the line I saw was 42.e4 dxe4 43.d5 dxd5 44.Qd6+ exchanges Q's. Anything else (the game line) allows passed protected pawns that kick at the Qc7. Further, the Black Pc6 needs to be there to prevent horizontal invasion by the Qa6. I'll leave the full analysis of lines to someone who actually did them. |
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| Jul-23-10 | | sethoflagos: Qd3/Qh7 jumped out pretty well immediately, and undoubtedly this is what I would have played ott. All wins score 1. Kudos to Riazantsev for finding a Fairey Swordfish to scupper the Bismarck. (Wish I'd spotted it!) |
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| Jul-23-10 | | Eduardo Leon: <PART 1>
It is clear 42.♕a8+ ♖b8 does not lead anywhere. Even worse, 42.♖f2? potentially tosses half a point away: 42...♖b1+! 43.♖f1 ♖xf1+ 44.♕xf1 ♕xf7. White cannot afford to "redirect" his attack with 42.♕d3?, because of 42...♕g3! 43.♖g1 ♔xf7, and white will not win immediately. Black's weak h6 pawn (and, thus, the possibility of ♕xh6+ in the future) suggests the following thrust in the centre. <42.e4! dxe4>
Allowing 43.exd5 cxd5 44.♕xh6+ would be certainly worse. <43.d5! e3>
Of course, not 43...cxd5?? 44.♕xh6+. Black's last chance for a swindle is the passed pawn white has helped him create. <44.d6 ♕b8>
44...♕d8, fails to a similar procedure: 45.♕xc6 e2 46.♖e1 ♖d2 47.♕f3. The text has the relative advantage of creating more confusion. <45.♕xc6>
Creating a third passed pawn, which will be useful later on. <45...e2 46.♖e1 ♖d2> The immediate 46...♖b1 fails to 47.♕e8+ ♕xe8+ 48.fxe8=♕+ ♔xe8 49.♖xb1. And 46...♔xf7 47.♕f3+ means giving up the possibility of a swindle. <Continues...> |
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| Jul-23-10 | | Eduardo Leon: <PART 2>
Now 47.♕f3 meets 47...♕b2!, forcing white to make concessions (48.d7), but... <47.♕d7!>
The threat is 48.♕e7+ ♔g7 49.f8=♕+ ♔g6 50.♕ef7#.
<47...♔g7 48.♕e7 ♕f8 49.♖xe2 ♖xe2> The prosaic 50.♕xe2 ♕xf7 wins as well: 51.♕e7 ♕xe7 52.dxe7 ♔f7 53.♔h2 ♔xe7 54.♔g3 h5 (54...♔d7 55.♔g4 ♔c6 57.♔h5 ♔xc5 58.♔xh6 ♔b4 59.♔xg5 ♔xa4 60.h4) 55.♔f3 ♔d7 56.♔e3 ♔c6 57.♔d4. But there is a prettier procedure. <Continues...> |
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| Jul-23-10 | | Eduardo Leon: <PART 3>
<50.♕xf8+! ♔xf8 51.d7 ♖d2> Not 51...♔e7 52.f8=♕+ ♔xf8 53.d8=♕+.
<52.c6 ♔xf7 53.c7 ♖xd7 54.c8=♕> Now white threatens 55.♕c5, snatching the a pawn, so there are two possible replies: 54...♖a7 and 54...♖d5. Both can only delay the capture for a few moves. A) 54...♖a7 fails to 55.♕c4+ ♔g6 (55...♔e8 56.♕g8+ ♔d7 57.♕f7+) 56.♕e6+ ♔h7 (56...♔h5 57.h4+ ♔h4 58.♔h2) 57.♕b6. B) 54...♖d5 fails to 55.♕h8 ♖d6 (55...♔g6 56.♕g8+) 56.♕e5 ♖a6 57.♕b5 ♖a7 58.♕b6. |
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| Jul-23-10 | | Eduardo Leon: Well, this is about as far as I can calculate without a board. |
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| Jul-23-10 | | cjgone: I got first, second, and fourth moves right. Third, I wasn't sure of. |
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| Jul-23-10 | | SufferingBruin: <Eduardo Leon> You did all that without a board? Tell us... you're really Jason Bourne, right? |
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Jul-23-10
 | | Breunor: Like Timothee3331, I saw 42 Kg1. Does it work? I thought if black moves the rook along the b file, then 43 Qd3. Of course if the rook moves off the b file, then 43. Qa8 ch. On 42 ...Qd8, then 43 Q x c6, and 42 ...Qb7 43 Q x a5. Of course, e4 is better. |
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| Jul-23-10 | | Eduardo Leon: Yes, I did it without a board. But it took me quite a long time. More than 2 hours. |
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| Jul-23-10 | | Eduardo Leon: <Timothee3331> & <Breuer>: 42.♔g1 is an awesome kick-ass idea and is a valid solution (after all, it wins, doesn't it?), so why feel bad about it? |
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| Jul-23-10 | | Eduardo Leon: I meant <Breunor>, sorry. |
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| Jul-24-10 | | patzer2: For the Friday July 24, 2010 puzzle, the solution 42. e4!! prepares a double pawn sham sacrifice to enable a decisive break through of the passed d-pawn with 45. d7! to overload the Black Queen and overwhelm the Black King with mate threats. |
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