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| Feb-23-10 | | Caissas Clown: I bet white's 31.b3 was a slip of the finger - my guess is he wanted to play 31.Qb1 , but picked up / touched the pawn by accident. |
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| Feb-23-10 | | JeanGiskan: It could have been a very good game but 31.b3 spoils it all, nevertheless Bd1 is very nice. |
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| Feb-23-10 | | zb2cr: 32. ... Bd1 acts as a shut-off, making ... Qf1+ possible. It also discovers an attack on White's Queen. While White is taking care of one problem, the other destroys him. |
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| Feb-23-10 | | David2009: Tuesday puzzle 23/02/2010 S Horrocks vs G Mancini, 2010 Black 32...? White's Queen is short of squares but I can see no knck-out blow. In a game I would probably play
32...Bd1 expecting 33 Qa2 Bf3+ 34 Kg1 Rbd7 threatens Rd2 and I cannot see a defence.
Can this be it? - time to check.
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Right first move, wrong follow-up! So simple when the first move is played over the board. |
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| Feb-23-10 | | randomsac: I got the idea today. I was to busy looking for a queen trap that I overlooked the bishop's mate. close but no cigar. |
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| Feb-23-10 | | TheaN: Tuesday 23 February
<32....?>
Target: 1:25;000
Taken: 0:54;457
Material: Black up, doubled ♙
Candidates: <[Bd1]>... -ML-
For some reason, I spotted this one immediately, and defenitely not because I saw the entire idea in a second, just intuition. What's clear is that the puzzle is based on the discovered attack on the White Queen by the Bishop on b3. However, what can the Bishop attack to gain time on the White Queen? Actually nothing, if for example Bf7, White can just retreat his Queen, and nothing worth noting can be harassed by the clergy.... not directly... no. However, the White King is open wide, and that same Bishop can issue a bank rank attack by: <32....Bd1!> the same applies to Bf7, just move the Queen out of harassment, it seems. However, it's not that simple now: with Bd1 Black blocks the White Rook's defense of f1, so on for example Qa2: /A\
<33.Qa2 Qf1† 34.Rg1 Bf3‡ 0-1> that same Bishop without any significant points of attack, mates White! In fact, it's so bad for White that he has to concede with: /A\
<33.Nxd1 Rxd1†! 34.Rxd1 Rxb2  > losing. Time to check. |
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| Feb-23-10 | | TheaN: 2/2
The Nxd1 variation is obviously variation B, and I forgot to mention that 32.Qxb7 ends in the exact same way as in A, and 33.Rxd1 finds 33....Rxb2 at once. Saw all this, didn't mention it. |
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| Feb-23-10 | | sshhhh: 14. Rf3 - 16. Rh3 - 19. Rg3 - 21. Rh3 - 24. Rg3. Sequences like that don't really smack of having a plan, do they? |
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| Feb-23-10 | | Patriot: <<Once> This puzzle is one of those rare events - a combination that doesn't involve a sacrifice. And this could get us into one of our definition arguments. Some authors (eg Botvinnik) argue that a combination has to involve a sacrifice. Others say that a combination usually involves a sacrifice. The latter argument sounds right to me, but it is dangerous territory to dispute Botvinnik...> I would go with "usually", even though I would rather agree with Botvinnik AND play like him! |
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| Feb-23-10 | | avidfan: 32...Bd1! discovers an attack on the White Q/b2 while interfering with the Rook's defence of f1. The Black queen can infiltrate at f1 if the White queen moves away. This causes a deflection of the R/g3, which must intercept the attack on the king leaving f3 unguarded. The bishop at d1 now goes to f3 and delivers mate.
click for larger viewWould the bishop be described as a <desperado> ? |
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| Feb-23-10 | | Patriot: <<avidfan> Would the bishop be described as a <desperado> ?> The bishop "makes out like a bandit" but isn't a desperado. Hopefully this won't cause a semantics war, but I think most would agree a desperado is usually a trapped piece that has nothing better to do than to take out as much material and inflict as much damage as possible before being captured. |
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| Feb-23-10 | | kevin86: A sharp tactic:attack the queen and block the back row. Either the queen will be won or white will be (as in the text) mated. |
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Feb-23-10
 | | chrisowen: For white dire straits hes in. He eyes the rock e4 yet the mercury's rising and queen is under attack. Rook x-rays it so I see why Bd1 clops the knight over. 33.Qa2 telegraphs road for the killer queen Qf1+. Rook g1, a sore step he now rearranges the f3 flashing. |
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Feb-23-10
 | | Jimfromprovidence: <agb2002>
<B) 33.Nxd1 Rxb2 (33... Qf1+ 34.Rg1 Qf3+ 35.Qg2 + - [N vs P]) 34.Nxb2 Rd2 35.Rg2 (35.Nd1 Qe2 - +) Rxg2 36.Kxg2 Qe2+ and 37... Qxb2 - + [Q+P vs R].>This a deeper, very interesting line. After all, 33...Rxb2, below, seems inferior to the immediate 33...Rxd1. 
click for larger viewBut, after 34 Nxb2, black has 34...Rd2 below. (threatening 35...Qe2 with forced mate).
click for larger viewNow, if 35 Rcg1, black wins the knight with 35...Rxb2. If 35 Rg2, then 35...Rxg2 36 Kxg2 Qe2+ 37 Kg3 Qxe3+!, wins the rook instead. 
click for larger view |
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| Feb-23-10 | | agb2002: <Jimfromprovidence: <agb2002>
...
This a deeper, very interesting line.
...
If 35 Rg2, then 35...Rxg2 36 Kxg2 Qe2+ 37 Kg3 Qxe3+!, wins the rook instead.>If one day we co-author a book on tactics I'll contribute the deeply dubious lines :) |
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| Feb-23-10 | | Once: <Patriot: I think most would agree a desperado is usually a trapped piece that has nothing better to do than to take out as much material and inflict as much damage as possible before being captured.> Nicely put. It always makes me think of Butch Cassidy and Sundance Kid ... if you are cornered by an enemy army, you might as well go out all guns blazing. |
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| Feb-23-10 | | avidfan: Isn't checkmate the most extreme form of damage that can be inflicted upon an adversary? |
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| Feb-23-10 | | elohah: I am much more interested in the positional aspects of this game.His position is solid after move 25, yet the decision on the very next move is
suddenly absolutely crucial, indeed this is the CRUCIAL moment. White goes wrong with 26 dc? and later with 29 a3, after which, apparently, his
position collapses. |
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| Feb-23-10 | | elohah: Yes, it must be 26 de! and then 27 f5!
But he would then have to not fight on the d-file (the battle there has
already been lost) but shift all major pieces to the f and g-files for a full-out Kingside assault.
And this is what a CRUCIAL moment is all about. It imposes RESPONSIBILITY. |
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| Feb-23-10 | | Patriot: <<avidfan>: Isn't checkmate the most extreme form of damage that can be inflicted upon an adversary?> Yes, but 32...Bd1 is not a desperado. A desperado is a piece that is surrounded by enemy forces with no hope for escape and is in a desperate situation. 32...Bd1 is more like a discovered attack and interference tactic. Before that, the bishop is not threatened in any way so it's not a desperado. The bishop here does seem like an outlaw in some ways because it seems to do what it wants. It moves to a square where it would normally be taken but the fact that the queen is now hanging makes it a discovered attack. And the fact that it now interferes with the defense of f1, makes it an interference move. |
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| Feb-23-10 | | eric the Baptist: This was harder than a tuesday puzzle should be. |
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| Feb-23-10 | | wals: After several self-defeating moves, White imploded with 29.a3 (-5.20).
Better was g5 (-1.06).
courtesy of Rybka 3 1-cpu: 3071mb hash: depth 19:
and a neat checkmate! |
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| Feb-23-10 | | YoungEd: Somewhat surprisingly, the correct answer just leapt out to me, all the way to the finish! Why can't that happen over the board? |
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| Feb-23-10 | | YouRang: Jeez, I almost forgot about the daily puzzle! Thankfully, my friends here stepped up to answer it so that those who normally await my answer could at least stop holding their breath. Anyway, I'm happy to report that I got it. I first saw the idea of ...Qf1+ (it would be mate except that black can interpose with Rg1, or worse, take my queen with Rxf1). Then I noticed that black has a lovely discovered attack on white's queen by moving the bishop. All I need is a good place to move the bishop to. Only a moment of contemplating the above problems lead me to the solution: 32...Bd1! -- it answers both problems: If white moves his queen out of take, then 33...Qf1+ works because (1) ot blocks Rxf1 and (2) it's ready to answer 34.Rg1 with Bf3#. Not hard, but pretty because of the resourcefulness of the bishop. :-) |
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| Feb-23-10 | | MaczynskiPratten: <Caissas Clown: I bet white's 31.b3 was a slip of the finger>. I don't think so. If 31 Qb1 as suggested, Qe2 (and Rd2 if necessary) are horrible for White. White wants to keep his Queen guarding e2, so sac's the b pawn to give it an "escape" square at b2. Which allows the beautiful finish! |
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