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| Oct-07-04 | | freshstart: Quite sneaky by Larsen.
61...Bxa7 62.Kc8 zugzwang.
Black must move the king away from the bishop.
Larsen always showed fighting qualities - he never gave up on a position. |
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| Feb-17-10 | | dzechiel: White to move (60?). White has rook and pawn for a bishop. "Medium/Easy." I have to rate this one as very easy, as I saw the solution immediately. White finishes up with
60 a7
Threatening 61 a8=Q
60...Bxa7 61 Kc8
Zugzwang! Black must move, but any move he makes will leave his bishop en prise, extinguishing any small flame of hope he may have had. Too bad for Miles. Time to check. |
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| Feb-17-10 | | prbprb2: It seems like Miles might have found a way to avoid losing 3 pawns from move 37 onward. Any chess computers want to play black from move 37 on? What is the evaluation of the position at that point? |
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Feb-17-10
 | | Phony Benoni: It will be an interesting question whether 61.Kc8 also works, one possibility being 61...Ba7 62.Ra1 Kc6 63.Rb1 followed by Rb7 and a7. But in any event, 61.a7 is the simplest way. |
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| Feb-17-10 | | lost in space: 60.a7! Bxa7 (or the pawn will promote)
61. Kc8.
Zugzwang. Was immer Schwarz auch ziehen mag, er verliert den Läufer erstazlos. |
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| Feb-17-10 | | ruzon: <Phony Benoni: It will be an interesting question whether <60>.Kc8 also works, one possibility being 60...Ba7 61.Ra1 Kc6 62.Rb1 followed by Rb7 and a7.> I think after 60.Kc8 Ka7 White can't make much progress, can he? Fine puzzle. |
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| Feb-17-10 | | RandomVisitor: According to firebird, 60.a7, 60.Rb3+, 60.Ra1, 60.Ra4, and 60.Ra2 all work. |
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| Feb-17-10 | | mrsaturdaypants: 60 a7 Bxa7 (on any other move, 61 a8=Q) 61 Kc8
Any move loses black his bishop, and the game. Way to zwang that zug, Bent Larsen. (I first tried 60 Kc8, which is almost surely what I would have played in a game. When I saw black's defense to that, I realized that the a pawn might need to go, and that black's bishop could be made woefully short of moves.) Time to check. |
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| Feb-17-10 | | BlackWaive: I spent a good deal of time trying to make
60. Rb3+ Ka7 61. Rb7+ Ka8
work for White, to no avail. Then I considered pushing the pawn, and saw the zugzwang. Funny how I didn't immediately consider pushing the pawn... |
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| Feb-17-10 | | zooter: Well, this is a good endgame puzzle...
I tried to make 60.Rb3+ for a long time, but failed after a line like 60.Rb3+ Ka7 (60...Kxa6 61.Rxb8 wins) 61.Kc6 B-moves.... So, let's go back to the drawing board
How about
60.a7 Bxa7 (only move) 61.Kc8 and the poor bishop is lost with a winning game for white Great puzzle in fact... |
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| Feb-17-10 | | patzer2: Larson sets up a winning endgame zugzwang with 60. a7! which solves today's Wednesday puzzle. |
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| Feb-17-10 | | remolino: 60.a7 Bxa7 61.Kc8 is pretty obvious, easier than yesterday. |
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| Feb-17-10 | | SamAtoms1980: Dear Lord, I let this one get away.
Started out by looking at 60 a7 ---- for about two seconds ---- then switched to 60 Rb3+ because I thought it was winning after 60 ... Ka7 61 Rb7+. Then I spent the rest of the time looking for a win after 61 ... Ka8, like 62 Kc8 and a later possible zugzwang. I might as well have spared myself the bother because the win was already gone. Naturally, I didn't see that 60 a7 Bxa7 61 Kc8 produced the desired zugzwang. Booted a Nalimov! |
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| Feb-17-10 | | rhedrich: I didn't see 60. a7. Instead, I tried Kc8, which still works. It just takes a lot longer to get the King to b5 if 61...Ka7. |
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Feb-17-10
 | | LoveThatJoker: Got it!
This is a great game!
Should be GOTD at some point.
LTJ |
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| Feb-17-10 | | dzechiel: <rhedrich: I didn't see 60 a7. Instead, I tried Kc8, which still works.> After 60 Kc8 Ka7 allows black to draw. |
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| Feb-17-10 | | nuwanda:
of course, once you see the zugzwang after 61.Kc8, 60.a7 is easy to spot. but whats more interesting is the win after a "more natural" move like e.g. 60.Rb3+ Ka7.
playing a bit around, maybe with the help of tablebases, it becomes clear, that once black manages to get his bishop to the a7-g1-diagonal, the position is drawn. but with some accurate moves white can prevent this. try a bit, its instructive
... |
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| Feb-17-10 | | agb2002: White has a rook and a pawn for a bishop.
White can't afford to lose his pawn because the black king is near the right corner (light square and dark square bishop). However, the black king is on a dark square, blocking his own bishop, which suggests 60.a7 Bxa7 61.Kc8, trapping the bishop. I also considered a direct attack against the black king with 60.Rb3+ Ka7 61.Rb7+ Ka8 62.Kc8 (62.Kc6 Ba7) Bg3 63.a7 but 63... Bf2 wins the pawn and draws. |
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| Feb-17-10 | | rhedrich: <dzechiel: After 60 Kc8 Ka7 allows black to draw.> Not if white plays correctly, it doesn't. |
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| Feb-17-10 | | nuwanda: hi <rhedrich>,
and what will be the correct play?
Will be a hard job, as you have to beat tablebases
... |
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| Feb-17-10 | | turiya: I thought Ke6 with the plan of putting the King eventually on b5. a7 is obviously much more faster. |
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| Feb-17-10 | | whiteshark: That's simple chess. Beautiful. |
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Feb-17-10
 | | Honza Cervenka: <I spent a good deal of time trying to make 60. Rb3+ Ka7 61. Rb7+ Ka8
work for White, to no avail.>
That's right because it's already tablebase draw. But 60.Rb3+ Ka7 61.Kc6! wins. The Pawn can't be taken for mate and so black must play 61...Ka8 or Bishop somewhere on b8-h2 diagonal. If he plays 61...Ka8, then 62.Re3 Bh2 (62...Ka7 63.Kb5 Ka8 64.Re8 Ka7 65.Re7+ Ka8 67.Kb6 reaching a key position where black must move with Bishop which leads to quick loss, for example 67...Bh2 68.a7 Bg1+ 69.Ka6 Bxa7 70.Rxa7+ etc.) 63.Re1! (covering g1 and so threatening Kb6) 63...Bg3 (63...Ka7 64.Kb5 doesn't help) 64.Re2 (once again denying black Bishop possibility to give check after Kb6) 64...Bb8 65.Re8 Ka7 66.Kb5 Ka8 67.Ka5 Ka7 68.Re7+ Ka8 69.Kb6 etc. After any reasonable Bishop move instead of 61...Ka8 white can play 62.Rb7+ and black cannot take Pa6 because of mating threat would cost him a piece, even after 61...Be5 62.Rb7+ Kxa6 63.Rf7 Bc3 (63...Bb8? 61.Rf2  ) 64.Re3 Bb2 65.Rf2 Bc3 66.Ra2+ Ba5 67.Ra1 etc. After 62...Ka8 white by manoeuvres of his Rook on the seventh rank combining threats Kb6 and a6-a7 will force similar finish as in above mentioned lines. Of course, Larsen's solution is much more simple and cute. |
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| Feb-17-10 | | TheaN: Wednesday 17 February
<60.?>
Target: 2:10;000
Taken: 0:28;158
Material: White up, ♖+♙ / ♗
Candidates: <[a7]>
-ML-
For some reason the first and only move I looked at was a7. I guess it's some experience that when I start hunting for the Bishop with a Rook move, the Black will always be always to defend against the a-pawn, whilst after a King move Black has the blocking Ba7. In fact, a7 is probably the only winning move and quite nice. <60.a7!> threatening a8=Q and Bxa7 is necessary. <60....Bxa7 61.Kc8! > zugzwang. When the King moves, Rxa7, when the bishop moves, Kxb8 and a win. Time to check. |
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| Feb-17-10 | | TheaN: 3/3
Had the idea more moves win but this is by far the easiest and the fastest to mate, so two in one. There is actually a name for either (fastest to mate, and easiest win, there are rates for that) but I can't remember them. Anyways nice end by Larsen. |
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Kibitzing
sac: 28.Nc6+