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Later Kibitzing> |
Mar-01-12
 | | OhioChessFan: <limpin: you have worked out an interesting variation man, i think <white threatens 30.Bg4! g6 31.f5 and threatens the advance of h pawn>- i don't kno how black parries the threat of white bishop accessing the diagonal b1-h7 diagonal- as black rook can't access single white square on 1st rank to escape from the pin. Whats ur take?> I haven't spent much time on it, but those ideas are there. I am not sure if White can get his King activated without allowing a check. If white pushes the g and h Pawns, then any King move along the g file leads to Rg1+ and if He goes to h3, then Bf5+. If Bg4 to allow the King down the f file, then Be4+. I think White's best option is Ra3 threatening Rb3 and the b7 and c6 Pawns are a real problem for Black. Maybe then 26. Qd7 Rxf4 27. Qxe7 Rxe7 28. gxf4 Re1 29. a4 a5 30. c5 Kg8 31. Ra3 Kf8 32. Rb3 Be4 33. Rxb7 Bxf3+ 34. Kxf3 Rc1 
click for larger view
White has some chances, I guess. |
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| Mar-01-12 | | Memethecat: <Penguincw> Agreed! That Suba chap is a bit slippery though, I like the cut of his jib. |
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| Mar-01-12 | | James D Flynn: This is obviously a back rank mate theme. I was looking at the position on the screen for quite a while, playing with moves like 26.Qd2 more or less forcing the reply Rxf4 when Qxf4 threatens mate on b8. 26.....Bg6 allows Rxe1 and the Q cannot retake because of mate on f8, so a black pawn in front of the K must move e.g 26..h6 27.Be4 Rd1 defends the back rank. I then set up the position on the board and quite quickly realized that 26. Rxb1 Rxb1 27.Qe4 overloads the Black Q e.g 27...Re1 28.Qxe2 and the R cannot retake because of mate on f8. If Black play Rxf4 again 28.Qxe2 and Black is forced to move a pawn after which Q and B will quickly mate. |
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| Mar-01-12 | | jackpawn: Unlike the other days this week where I found the solution immediately, I had to work through this one a little. At first I wanted to play 26. Qd7, but that doesn't work. I knew I wanted to take advantage of the weak back rank. Then it occurred to me - take the bishop and play 27. Qe4, hitting both the queen and rook, taking advantage of the weak back rank. |
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| Mar-01-12 | | pedro123: An awful lot of back rank positions of late. A little variety wouldn't go amiss. |
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| Mar-01-12 | | Marmot PFL: It looks at first as if the puzzle could have started a move sooner (25 Rf4), but 25...Qg8 seems to save black. As played, the Qe7 needs to defend Rf8, so white can win with 26 Rxb1 Rxb1 27 Qe4 with double attack. |
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Mar-01-12
 | | kevin86: An odd ending.At move 26, The square of e4 is thrice guarded;could anybody have guess that moving the queen there just one move later would be the solution. The final move is a cross between a pseudopin and a fork. The queen cannot be taken on pain of mate,and the rook at b1 is lost. White wins the exchange. |
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| Mar-01-12 | | lost in space: Saw it within 1 minute:
26. Rxb1 (to elemínate an protector of the field e4)
26..Rxb1 27. Qe4! and 1:0
If 27...Qxe4 28. Rf8#
If 27...Rxf4 28. Qxe7 and due to the mate threat of the white queen on e8, f8 etc. , Black is not able to play 28...Rxf3; even 28...Rf8 is not possible. If 27...Qd8 28. Rxf8+ Qxf8 29. Qxb1 White is a rook up |
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| Mar-01-12 | | David2009: Suba vs L M Garcia Lopez, 1994 White 26.? White can snack on a Bishop: 26.Rxb8 and if 26....Rxb8 27.Qe4! etc, or 26...Re1 Qxe7 etc. Vulnerable back rank. Time to
check:
====
Black finds a complete answer to White's threats: 27...Resigns |
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| Mar-01-12 | | Patriot: White is up a pawn.
I tried several ideas, like 26.Qd7 Rxf4 27.Qxe7 Rxe7 28.fxe4 Bg6 (28.Rxb1 Rd4  ) or 26.Rxf8+ Qxf8 27.Qd2 (trying to remove the guard) Qe8/Qe7 holds on. The winner seems to be 26.Rxb1 Rxb1 27.Qe4, forking queen and rook. If 26...Rd8 27.Rxe1 Rxd4 28.Rxe7 wins 2 pieces. 26...Rxf4 27.Rxe1 Rxd4 28.Rxe7 h6  (white wins a piece). |
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Mar-01-12
 | | chrisowen: 22...Bb1 the monkey escalade queen in g6 I think it is risky to Sinbad Suba legend makes short work of it ripe for queen including black get bottled down e and ffile rd8 keeps him at bay for strife in bat 25 qe7 it route her e8 migh ave recouped majesty. Queens on board in middle game why it is feckless in to punish b1 and e1 black in really needs tempo this for king in bolt h8 [25...qe8 26.rxf8+ qxf8 27.qc3 qe7 28.b4] queen in open white's still have win but hand qe7 in duty it arrange quick for demise 26.Rxb1 Rxb1 27.Qe4 pleased to coin ack soldinks hook in line harbour umble cleric b1 fit the deck your ignoble wind to the back, rats qe4 clink together gentle would rank inceed the point first bade it rookxb1! |
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| Mar-01-12 | | ajile: <sevenseaman: White to play and win.>
Qxg7+ seems sufficient. |
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Mar-01-12
 | | sleepyirv: <Phony Benoni> Hey, I was going to write that! Great minds and thinking alike, I guess. There are really two types of chess puzzles: those based around backrow weaknesses and everything else. Instinct should solve the first and save the brain for the rest. |
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| Mar-01-12 | | King Death: Presented the way it is, this problem's an overloading combination of moderate difficulty. The skill here is mainly in forseeing the play as this very good GM did when his opponent gave him the chance. |
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| Mar-01-12 | | sevenseaman: <ajile> It is. |
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Mar-01-12
 | | Once: <sleepyirv: ... There are really two types of chess puzzles: those based around backrow weaknesses and everything else.> In reality, there are only types types of anything: one subset and everything else. |
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Mar-01-12
| | chrisowen: <paulalbert> Ha subtle! 23 rg4 re-enter e1+ in group it kg2 in siege thin from call it doctoring queen in f7 given wide 25 rf4 and qe7? Ok wangle son ar slide alive in gadzooks fly it tick off what b1 low see 19.qe3 nd4 20.bxd4 exd4 21.qxd4 bad stern naf rade it pc6 in use bf3 elder in evermore b1 us tool for having re mind castle in 26 rxb1 elking Suba in referal it arrange b1 light e4 deinty it queen fork e7 b1... |
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| Mar-01-12 | | BOSTER: "If I don't like somebody's opinion, this doesn't mean that I don't like this person". <Phony Benoni> <Tried 26.Rxb1 almost at random ,saw the fork after 26...Rxb1 27. Qe4> <phrases like these become instinctual>. I don't think that this is correct thought process, if you played 26.Rxb1 <almost at random>.
But ,if you can see moves 26.Rxb1 Rxb1 27.Qe4 Qxe4 and 28.Rxf8# simultaneously you are lucky. |
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| Mar-01-12 | | Crispy Seagull: Rook takes the bishop on b1. If the BR recaptures, Qe4 either deflects the BQ away from back row defense duties or, if she retreats to the back row, hangs the rook on b2. As an aside, probably the first Thursday puzzle I've nailed from start to finish. Was this a bit easier than it should have been, or is it me? Of course, it'd be nice if it was me... |
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| Mar-01-12 | | VincentL: "Medium".
The move required here is clearly one that will be about bring about a back rank mate or
result in the gain of material.
The first such move I see is 26. Qd7. If 26.....Qxd7 27. Rxf8# (and the same mate follows if the black queen
moves to a square where it does not defend the rook). But black can play 26.....Rxf4 and simply exchange
queens and rooks.
So we first need 26. Rxb1 ! If 26....Rxb1 then 27. Qd7 with different results. Now 27....Rxd4
is not possible on account of 28. Qxe7 (the black rook cannot recapture since it is now on
b1).
Black can try something like 26.....Rd8. But white continues 27. Rxe8 and after 27....Rxd5
28. Rxe7 white has gained both bishop and rook.
Black simply loses the bishop for nothing.
Let´s check. |
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Mar-01-12
 | | Phony Benoni: <BOSTER>: I've never said my thought processes were correct. Truthfully, I'm jealous of those who can outline step-by-step their path toward the solution. Usually, I work with flashes rather than logic. Today, I saw Black's king trapped in the corner and his ♖f8 defended only by the queen. The Back Rank Mate Alert Buzzer went off and I figured that deflecting the queen would figure in the answer. Then the lineup on White's first rank caught my eye, simply because it was so unusual. Maybe that's why I first looked at 27.Rxb1. After that distraction, I went back to deflecting the queen again, and now 28.Qe4 jumped out and the bonus of attacking Black's rook on b1 became apparent. I think that was the sequence, and it took all of five seconds or so. You can see I didn't solve it systematically, but jumped around from daydream to daydream. It didn't hit me until afterward that one point of 27.Rxb1 was to take Black's rook off the e-file. No, my thought processes are not correct and I don't recommend them to anyone else. |
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| Mar-01-12 | | King Death: < zakkzheng: Why coundn't black take the rook on move 11?> Black loses the queen to 12.Nh4. This variation was very common in the 1950s and 60s. |
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| Mar-01-12 | | King Death: < Phony Benoni: ...Usually, I work with flashes rather than logic...> In many cases I worked things out at the board the same way, it's probably a reason why I never got above about 2330 USCF. <...Today, I saw Black's king trapped in the corner and his f8 defended only by the queen. The Back Rank Mate Alert Buzzer went off and I figured that deflecting the queen would figure in the answer...> Looking at the puzzle sparked the same kind of reaction in me. <...Then the lineup on White's first rank caught my eye, simply because it was so unusual. Maybe that's why I first looked at 27.Rxb1. After that distraction, I went back to deflecting the queen again, and now 28.Qe4 jumped out and the bonus of attacking Black's rook on b1 became apparent.I think that was the sequence, and it took all of five seconds or so...> What's really strange is that it also came to me very fast, which I mention only to make the point that I've seen easier puzzles here that took longer.
Shows what I know.
<You can see I didn't solve it systematically, but jumped around from daydream to daydream...No, my thought processes are not correct and I don't recommend them to anyone else.> Too late pal, I've already hijacked them!! I'll tell you what though, if anybody asks I'll give full credit to some random guy up in Michigan that's got a fun sense of humor. |
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| Mar-01-12 | | BOSTER: <Phony Benoni>
How I noticed your comments ,as usual, open the first page of the new <POTD>. Honestly, for me this comment, like the opening in the chess game, attracts more attention, and I read other comments depend on the feeling which I already got. Thanks for your step-by-step analysis. |
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| Mar-01-12 | | Sularus: i failed to see 27. Qe4... I tried to make 27. Qd7 work to no avail. oh well. |
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Later Kibitzing> |
Kibitzing
sac: 26.Rxb1