|Aug-25-04|| ||urtley: looks like 20 ... Kxf7 21 Rf1+ Kg7 22. Bf8+ Kh7 Rf7++ |
|Aug-25-04|| ||JohnBoy: An easy call - 20...Kf7 21.Qf4+, so that if 21...Ke6 then 22.Qc4+, while if 21...Kg7 then 22.Bf8+. Cute puzzle.|
BTW, urtley, your rook check allows B to survive a bit longer with 21...Ke6
|Aug-25-04|| ||Nickisimo: Yep. This is similar to a lot of drills in CT-Art 3.0 actually. The king does have the option of coming to the e6 square after 21. f1+, but then a move like 22. e3 or 22. f4 would completely destroy him. I have no idea what the theme of this week is, or if there is one, but this is a nice, neat example of attacking a king in the center of the board. |
|Aug-25-04|| ||ConLaMismaMano: If 20...Kxf7 21.Qf4+ Kg7 22.Bf8+ Kh7 23.Qf7#
If 20...Kxf7 21.Qf4+ Ke6 22.Qg4+ Kf7 23.Rf1+ Kg7 24.Bf8+ Kh7 25.Rf7#
|Aug-25-04|| ||erikcu: Pinky: Gee, Brain, what is chessgames.com theme tonight?|
Brain: The same theme they have every night, Pinky. Try to take over the world!
(or maybe its to get the king into the open by sacrificing a piece?)
|Aug-25-04|| ||Karlo Santos: While working out the position, I was looking at 20...Nf6, which seems to put up a bit of a fight, but turns out to be just as hopeless. 20.Rxf7 Nf6 21.Rxf6 bxa2 22.Qg5 Qb1+ 23.Rf1! |
|Aug-25-04|| ||cu8sfan: After several days of tactic blindness (heck, I couldn't even find Monday's and Tuesday's solution!) I am glad to be back on the track.|
I saw this instantly but it took me some time to figure out the details and cover all the squares the king might move to. Black is terribly underdeveloped.
|Aug-25-04|| ||DexterGordon: I guess if Black refuses the rook with 20...Nh6, then 21.Qxh6. Does that seem right??|
I'm with you on the tactical blindness, <cu8sfan>! I've found this week's puzzles pretty hard.
|Aug-25-04|| ||Insightful: The king can try to escape via 20...Kxf7 21.Qf4+ Ke6 22.Qg4+ Kd5 23.Rd1+ Kc6 24.Qe4+ Kb5 25.Rd5+ Kc6 26.Rc5# but to no avail. |
|Aug-25-04|| ||carioli: 20...Kxf7 21.Qf4+ Ke6 22.Qg4+ Kd5
23.c4 Kc6 24.Qe4#
|Aug-25-04|| ||Tigranvp: Black is in zugzwang. 20. ...Nh6; 21. Qh6,Rh6; 22. Re8 ends the game. |
|Aug-25-04|| ||PawnBlock: on 20. . . Nf6 I like 21. Qh6! for W
21. . . Kxf7 (forced since 21. . . Rxh6 22. Rf8#) 22. Qxh8.
Now if 22. . . Ke6 then 23. Rd1 where B cannot stop both mate threats (Qxf6 and Qg8).
if 22. . . Ng5 then 23. Rd1+ Ke6 24. Qg8#
|Aug-25-04|| ||klausewitz: Sorry, but what's zugzwang? |
|Aug-25-04|| ||paulgrow: Zugzwang is a German word. It means "complusion to move" or something like that. What Tigranvp is saying is that if Black didn't have to move at all, Black would be ok. But because Black has to move, any choice he makes creates a fatal weakness that loses the game for him. |
|Aug-25-04|| ||ConLaMismaMano: <Insightful> If 20...Kxf7 21.Qf4+ Ke6 22.Qg4+ Kd5, then 23.c4+ (this looks better than Rd1+) Kc6 24.Qe4# |
|Aug-25-04|| ||sanferrera: <pawnblock> on 20...Nf6 21. Qh6 I think black has Rg8 too. Of course it is still won for white, but Kxf7 is not forced. Maybe you have to take the free piece with 21. Rxf6 |
|Aug-25-04|| ||kevin86: Sorry <Tigronvp> no zugzwang-as black is threatened with mate on f8. |
|Aug-25-04|| ||AlexKearns: If black plays 20...Nf6 instead of Kxf7, I think white's best reply is simply 21 Pxf6.|
Then, if 21...Kxf7, 22 Qd5+ Kxf6 (22...Ke8 23 Qe5+ Kd8 24 Qe7++) 23 Rf1+ Kg7 24 Bf8+ Kh7 24 Rf7++
Black might be able to extend the torture after 20 ...Nf6 21 Qh6 by ...Qxd6
|Aug-25-04|| ||patzer2: Today's puzzle (20. ?) solution is a "sacrifice on f7" with 20. Rxf7! It is an offer Black "can't refuse." Capture the "poison" Rook and get mated, or decline it and also get mated. |
If Black takes the Rook, play continues 20...Kxf7 21. Qf4+!, with White having to figure out four ways to mate (depending on Black's reply
to 21. Qf4+!).
(1) 21. Qf4+ Ke8 22. Qf8#
(2) 21. Qf4+ Kg7 22. Bf8+ Kh7 23. Qf7#
(3) 21. Qf4+ Nf6 22. Qxf6+ Kg8 (22...Ke8 23. Qe7#) 23. Qxg6#
(4) 21. Qf4+ Ke6 22. Qc4+! (also winning and equally good is 22. Rf1!) 22...Kf5 23. Rf1+ Kg5 24. Qf4+ Kh5 25. g4+! 25. Rf3! (also winning nicely is 25. h4! Qd8 26. g4+ Kxh4 27. Kg2 Qg5 28. Rh1#) 25...g5 26. Qf7+! Kh4 27. Rh3+ Kg4 28. Qf3#
If Black declines the 20. Rxf7! offer he also gets mated:
(1) 20. Rxf7! Nh3 21. Qxh3! Qxd6 (21...RxQ?? 22. Rf8#; 21...Rg8 22. Qf8+ ) 22. Qxh8+ Kxf7 23. Rf1+ (23. exd6 wins easier but takes longer) 23...Ke6 24. Qf6+ Kd5 25. Qxd6+ Kc4 26. Qd4+ Kb5 27. a4+ Ka5 28. Qb4#
(2) 20. Rxf7! Qxd6 21. Qxd6 Kxf7 22. Rf1+ (22...Kg7 23. Qf8+ Kh7 24. Rh7#
;22...Ke8 23. Rf8#) 22...Nf6 23. Qxf6+ Ke8 (23...Kg8 24. Qxg6#) 24. Qxh8+ and mate quickly follows.
(3) 20. Rxf7! Nf6 21. Rxf6 bxa2
[21..b2 22. Rb1 g5 (22...Qd8 23. Qd5! ) 23. Qxg5 ; 21...bxc2 22. Raf1 Qb1 23. Qh6! Qxf1+ (other Black moves yield mate in one or two) 24. Rxf1 Rg8 (24...Rxh6 25. Rf8# 24...c1Q 25. Qxh8#) 25. Qf8+ Rxf8 26. Qxf8#]
22. Qg5 (following 20. Rxf7! Nf6 21. Rxf6 bxa2 above) 22...Qb1+ 23. Rf1! Qxf1+ 24. Rxf1 Rxh2+ (24...a1Q 25. Qe7#) 25. Kxh2 a1Q 26. Rf8#
(4) 20. Rxf7 Ne7 21. Rxe7+ Kd8 (21...Kf8 22. Qf4+ Kg8 23. Qf7#) 22. Qg5 leads quickly to mate.
The only theme I can see this week is "pseudo-sacrifices" or "make them an offer they can't refuse." I'll include this one in my "Demolition of Pawn Structure" collections (sacrifice on f2/f7).
|Aug-25-04|| ||PawnBlock: <sanferrera>: on 20...Nf6 21. Qh6 Rg8? 22. Qg8+ Rxg8 23. Rxg8#.|
Rook could take first too, but Q-sac's are always so exciting . . .
|Aug-25-04|| ||Andrew Chapman: Pawnblock, you mean 22.Qf8+ |
|Aug-25-04|| ||cydmd: Several lines have been discussed but I didn't see the complete solution of the puzzle. So, thatīs my understanding:
21.... Kxf7 22.Qf4+ Ke6
(22.... Kg7 23.Bf8+ Kh7 24.Qf7#)
(23.... Kf7 24.Rf1+ Kg7 25.Bf8+ Kh7 26.Rf7#)
24.Rd1+ Kc6 25.Qc4+ Qc5 26.Qxc5#
In this line, 23.Qc4+ also wins.
21.... Nf6 22.Qh6 Kxf7 23.Qxh8 Ke6
(23.... Ng4 24.Rf1+ Nf2+
[24.... Ke6 25.Qg8+ Nf7 26.Qxf7#]
25.Rxf2+ Qxf2 26.Qf8+ and 27.Qxf2)
24.Qxf6+ Kd5 25.Qf7+ Ke4
(25.... Kc6 26.Qc4+ Qc5 27.Qxc5#)
|Aug-25-04|| ||Titicamara: This one is too easy. :p Anything harder? |
|Aug-25-04|| ||VStrider: Looking at the position of the puzzle, i saw two options: 1) the obvious 20.Rxf7 followed by 21.Qf4 or|
2) 20.Qg5 followed by 21.Qxg6 threatening mate either with 22.Qxf7 and 23.Qf8# or if black takes the queen, 22.Rf8#. There is no defence. If black tries to defend g6 with Rh6, then Rxf7 followed by Kxf7 and Rf1+ finishes him off.
I decided i'd play the 2nd variation and asked fritz what he thinks of it.
The funny thing is that fritz8 considers 20.Qg5 as a bad move! he gives the advantage to black by -0.50 and then slowly giving white the advantage. 4 moves later he gives white something like +15.00 and finds mate in many variations. I was surprised that fritz thought that with 20.Qg5 black survives. It just shows the limitations of computer programs. They just cann't judge positions like humans do.
|Aug-25-04|| ||patzer2: <VStrider> You might try letting Fritz 8 run a little longer and/or deeper. My Fritz 8 shows 20. Qg4! (+4.66) and 20. Qf4! (+3.00) at 13/43 depth as White wins in about five minutes. Of course Fritz 8 found a forced mate in twelve with the stronger 20. Rxf7! almost immediately. |