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| Aug-01-12 | | gofer: <Abdel Irada:> and <NyP>: I agree with you both! <29 Bxg7 ...>
is a win for white. But black has a nice defensive resource. <29 ... Qd6+>
<30 Be5 Rg7!>
The real trick is to find the winning move from here! 
click for larger viewTry against <Crafty EGT>... http://www.chessvideos.tv/endgame-t... I found a pin to out pin the pin I am in... |
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| Aug-01-12 | | hms123: Here's an interesting parallel:
After <29...Re7>
click for larger viewWhite has this possibility:
<30.Bxg7 Qf1 31.Qg5 Qxg2+ 32.Qxg2 Bxg2 33.Bf6> 
click for larger viewIf after <29...Re7 30.Bxg7> Black tries <30....Rxg7>, then <31.Qxe6+> 
click for larger view and mates. 1.  (#3): 31...Rf7 32.Qe8+ Kg7 33.Qh8+ Kg6 34.Qh6# 2. (#2): 31...Kf8 32.Rh8+ Rg8 33.Rxg8# |
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Aug-01-12
 | | paulalbert: Bxg2 was the obvious candidate move, but since it's not check, it gives white a lot of defensive possibilities with his own attack. I certainly didn't consider Rh8ch. I give myself no credit on this since I didn't properly analyze all the defensive tries. Perhaps it's some consolation that Nick didn't see it all either. |
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| Aug-01-12 | | YetAnotherAmateur: <JimFromProvidence> Your position doesn't seem that hard: 33. ... Rxg7 gets black out of trouble easily enough. If 34. Qh4+/Qh6+ Kg8 and white can't check again without losing his queen. Other approaches leave white down a Q+R. |
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| Aug-01-12 | | Alex56171: <Jimfromprovidence: You need to calculate the result after 33 Bxg7+ to say that you have solved this one.> Yes. At least 12 moves more to stop white Queen checks. |
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Aug-01-12
 | | doubledrooks: <gofer>: How about 31. Rh8+ Kf7 32. Rh7? |
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| Aug-01-12 | | Clodhopper: Wow. I guessed 31 ..., Bxg2 and realized that white was lost if he took the bishop. But I never imagined DeFirmian's response and I'm sure i would have cracked if I faced it over the board. |
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Aug-01-12
 | | kevin86: Wow! That was a little complicated for me. ouch! |
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| Aug-01-12 | | jpolchinski: <gofer> Thanks for the clue, a nice line! |
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Aug-01-12
 | | chrisowen: Steal a march in proceedings 31 bxg2 looks right got the gist black needs to get his own counter play going queen arrives to cover in h1 could light wriggle out by saccing his rook thought never occured to me at first hooks in h8 and king can escapes in driven h7 as bolt hole both players missed a couple off tries before hand good to see ND keep on trekking banging in away it is a g7 in as key for white rook hide can be exposed it exchange in g2 better eg advantage light in g5 allows combination great harvests in g2 should prove decisive. |
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| Aug-01-12 | | Crispy Seagull: Missed it completely. Little tough for a Wednesday, maybe? |
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| Aug-01-12 | | dragon player: I considerded only one move when I saw this puzzle:
31...Bxg2
32.Kxg2
If 32.Qxg2 Rd2, winning the queen.
32...Rd2+
33.Kg3 Qg1+
34.Kf4
If 34.Kf3 Qxg5
34...Rf1#
Time to check.
---------------
In the game black prefered to not take the bisshop and gave a shower
of checks, but lost anyway.
3/3 |
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| Aug-01-12 | | xthred: How is this medium/easy! |
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| Aug-01-12 | | mworld: suprisingly, this was one of the ones I just had an inspired moment on after glancing at it....although I admit that I thought there could still be a draw somewhere for white - but i considered that 'winning' for black with how dire the threat of losing was. |
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| Aug-01-12 | | hellopolgar: well it did show the position after white's 31. Qg5 <but> it also showed that it's WHITE'S turn to move(maybe just on my computer?)...however i did find the right move in that particular position if it's white's turn to move...the move is Qg6... |
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| Aug-01-12 | | morfishine: <hms123> Very nice post! I find it surprising that Defirmian missed this opportunity. |
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| Aug-01-12 | | RandomVisitor: Black missed 28...Qxh4!
click for larger view Rybka 4.1 x64:
[-1.85] d=18 29.Be5 Rd8 30.Bc2 Qh6 31.Bf4 Qg6 32.Bg5 Rd4 33.Kh2 e5 34.Qg3 Kh8 35.a4 Kg8 36.a5 Be4 37.Bxe4 Rxe4 38.h4 a6 39.Qf3 Qf7 40.Qg3 [-2.14] d=18 29.Qe5 Re7 30.Bc1 Qd4+ 31.Qxd4 cxd4 32.Bg5 Rd7 33.Bf4 Kf7 34.Be5 g5 35.b4 f4 36.Kf2 Kg6 37.a4 d3 38.b5 Rd8 39.c5 Rd5 40.Bd6 e5 41.Bb3 d2 42.Ke2 Rd4 |
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| Aug-01-12 | | David2009: DeFirmian vs A Rustemov, 1999 Black 31? I have come to this POTD very late, after the Olympics on TV and the splendid excitement of DeFirmian vs A Rustemov, 1999.
31...Bxg2 fatally exposes the White King. Check:
====
As expected. Here's the position colours-reversed
click for larger view (N DeFirmian vs A Rustemov 1999 31...? colours reversed)
to see if Crafty End Game Trainer (defending the colours-reversed position - it always plays Black) can find salvation. Interactive link (White to play and win):
http://www.chessvideos.tv/endgame-t.... The ever-optimistic robot tries for perpetual check by the colours-reversed equivalent of 32.Rh8+ Kxh8 33.Bxg7+ which doesn't work either. <gofer> excellent Crafty EGT link! I saw the cross-pin (helped by the knowledge that it was there) but then made heavy weather of the QPPP vs R+B ending despite White's enormous material advantage. |
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| Aug-01-12 | | 5hrsolver: Got this one up to 35...g6 to avoid perpetual.
The line mentioned by <Jimfromprovidence> is something I have not considered. Looks like a lot of checks. |
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| Aug-01-12 | | LoveThatJoker: <31...Bxg2! 32. Kxg2> [32. Qxg2 Rd2 33. Qxd2 Qxd2+  ; 32. Kg3 Rd3+ 33. Kxg2 (33. Kf4 Qf3#; 33. Kf2 Qf1#) 33...Qe2+ 34. Kh1 Rd1+ 35. Qg1 Qf3+ 36. Kh2 Rd2+ 37. Qf2 Qxf2+ 38. Kh1 Qg2#; 32. Rf4 (say) 32...Qh1+ 33. Kg3 Rd3+ 34. Rf3 (34. Kh4 Qxh3#; 34. Kf2 Qf1#) 34...Rxf3+ 35. Kh4 Qxh3#] <32...Rd2+ 33. Kg3>
(33. Qxd2 Qxd2+ )
<33...Qg1+>
[33...Rd3+ 34. Kh2 (34...Kf4 35. Qf2#) 34...Qe2+ 35. Qg2 (35. Kh1 Rd1+ 36. Qg1 Qf3+ 37. Kh2 Rd2+ 38. Qf2 Qxf2+ 39. Kh1 Qg2#) 35...Qxe5+ is also winning for Black] <34. any Qf2#>
LTJ |
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| Aug-01-12 | | LoveThatJoker: I see that White went in for 32. Rh8+. I rejected posting anything on this because it was clear to me that after 32...Kxh8 33. Qh6 Kg8, White had nothing and just lost a R. Full point for today. This said, now that I can shuffle the pieces around, I've noticed that 31...Bxg2! 32. Kxg2 Qe2+ is stronger than my also clearly winning main line of 31...Bxg2! 32. Kxg2 Rd2+. LTJ |
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| Aug-01-12 | | M.Hassan: "Medium/Easy"
Black to play 31...?
Dead equal.
Something tells me to remove g2 pawn:
31...........Bxg2
<if 32.Qxg2 Rd7 and Black Queen will fall> 32.Kxg2
Black can give a check now and get the e5 Bishop but he is after deeper threats: 32...........Rd2+
33.Kg3 Rg1+
34.Kf4 Rf2+
35.Ke3 Qxg5+
36.Rf4 Rh2
And White has to continue a Queenless game.
Time to check
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Very different |
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| Aug-01-12 | | stst: 31.Bxg2 suffices
IF (A)32.QxB Rd2 and White's Q is pinned;
IF (B)32.KxB Qe2+, 33.Kg3 Rd3+, 34.Kf4 Qe4#
IF (C)White ignores B@g2, 32.any other move, Qh1+ and mate follows after Rd3+ |
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| Aug-01-12 | | TheBish: DeFirmian vs A Rustemov, 1999 Black to play (31...?) "Medium/Easy"
Forgot to do this earlier, too busy with work and watching the Olympics. The short version is that Black wins with 31...Bxg2!, threatening 32...Qh1+ 33. Kg3 Rd3+ with a winning attack. If 32. Kxg2 Rd2+ wins, i.e. 33. Kg3 Qg1+ 34. Kf4 Qf2#! (better than winning the queen with 34...Rf2+). Or 32. Qxg2 Rd2, winning the queen. Nearly 9:00 PDT (or Thursday in the world of CG.com), so time to turn in my "homework". Sorry Nick, must have been a tough loss. |
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| Feb-17-15 | | The Last Straw: Wow. It turns out that 30. ♗xg7!! wins for white. |
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