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Kenneth S Rogoff vs Steve Spencer
US Jnr Chp (1969)  ·  Caro-Kann Defense: Gurgenidze System (B15)  ·  1-0
To move:
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Given 1 time; par: 41 [what's this?]

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sac: 18.Nxf7 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Feb-07-14
Premium Chessgames Member
  YouRang: Apparently, this game was annotated by Bobby Fischer:

http://chessforallages.blogspot.com...

Apr-14-15  Howard: I recall Fischer's going over this game in Boys Life...it was the first time I'd ever heard of Rogoff.

There was a place where Rogoff makes an impressive move, and Fischer writes, "White explodes his combination."

Oct-02-15  Abdooss: Chessgame.com shows Fischer's analysis of this game here --- < http://en.chessbase.com/post/did-yo... >
Dec-30-16
Premium Chessgames Member
  Gregor Samsa Mendel: I thought I got this one, but then I remembered that my wife got me a book compilation of Fischer's Boys Life columns as a Christmas present, and I had just read his annotations on this game.
Dec-30-16  johngalt5579: I might start with 18 Nf7 and if Kf7 then 19Re6 poses multiple threats.
Dec-30-16  wtpy: 17..Nd5 looks like it holds though white has a little plus with be7 perhaps keeping the bishop on the a3 f8 diagonal.
Dec-30-16  backyard pawn: After 19..., Ne8, White misses mate in 2.
Dec-30-16
Premium Chessgames Member
  TheBish: I got it, but also missed the quicker mate in 2! I think it has everything to do with analyzing Rxf6+ when the knight is still on f6, and so it's easy enough to see the mate in 4 after 19...Ne8 20. Rf6+, and once you see that, there are no bonus points (in a real game anyway) for pausing to find the quicker mate. I use a tactics program that would severely penalize you for missing the quicker mate! It's quite annoying, because you can find 4 brilliant moves in a row but miss solving the problem (and lose big points) for not finding the BEST move to finish the combination, even though the 2nd best move is still easily winning.

I thought this was pretty easy for a Friday, didn't have to spend much time at all on it.

Dec-30-16
Premium Chessgames Member
  agb2002: The material is identical.

White can expose the black king with 18.Nxf7 Kf7 (otherwise Black loses the e-pawn also without compensation) 19.Rxe6:

A) 19... Kf8 20.Bxf6 + - [2P].

B) 19... Kg8 20.Re8#.

C) 19... h6 20.Rxf6+ Ke8 (20... Ke7 21.Rf7+ Kd6 -21... Ke8 22.Re1+ Be5 23.Rxe5#- 22.Bf4+ Be5 23.Bxe5#) 21.Re1+ Kd8 (21... Kd7 22.Rf7+ Kd6 23.Re6#) 22.Rxg6+ hxg5 23.Rxg7 + - [3P].

D) 19... Nd5 20.Rxc6

D.1) 20... Rxc6 21.Bxd5+ Re6 22.Bxa8 + - [3P].

D.2) 20... Rd8 21.Rc5 Ke6 (21... Bb7 22.Rc7+ Kf8 -the knight is pinned- 23.Rxb7 + - [B+3P vs N]) 22.Re1+ wins. For example, 22... Kf5 23.Bxd5 Rac8 24.Be6#.

D.3) 20... Bb7 21.Bxd5+ Kf8 22.Rd6 Bxd5 (22... Rd8 23.Rxd8+ Rxd8 24.Bxb7 + - [B+3P]) 23.Rxd5 + - [3P].

E) 19... Nh5 20.Rf6+ Ke7(8) 21.Re1+ Kd8 (21... Kd7 22.Rf7+ Kd6 23.Re6#) 22.Rf7+ Bf6 (22... Nf6 23.Rxg7 wins) 23.Bxf6+ Nxf6 24.Rxf6 + - [2P].

F) 19... Ne8 20.Rf6+ Ke7 21.Rf7+ Kd6 22.Bf4+ Be5 23.Bxe5#.

Dec-30-16  leRevenant: I think the days of the week have been mixed up.
Dec-30-16
Premium Chessgames Member
  cocker: I agree with <leRevenant>. There has been no graduation in difficulty this week.
Dec-30-16  morfishine: Standard sac on <f7>
Dec-30-16  stacase: All of White's pieces are positioned just right. How come that never happens in my games? I suppose it does, I just never see it (-:
Dec-30-16  ChessHigherCat: <stacase: All of White's pieces are positioned just right. How come that never happens in my games?>

Bobby answers from beyond the grave:
12. Ng5 Notice [stacase], how Ken slowly builds up his position. Before he takes any decisive action, he moves all his pieces out to their most active posts http://en.chessbase.com/post/did-yo...

Dec-30-16  mel gibson: It's not a quick mate.
The computer DR4 64 bit - agrees with move 18 but says:

18. Nxf7 (18. Nxf7 (♘e5xf7
♘f6-d5 ♖e1xe6 a5-a4 ♗b3-a2 ♔g8xf7 ♖e6xc6 ♖c8xc6 ♗a2xd5+ ♖c6-e6 ♗d5xa8 ♗g7-f6 ♗g5-e3 ♖e6-e7 ♖a1-e1 ♗a6-c8 ♔g1-h2 ♗c8-b7 ♗a8xb7 ♖e7xb7 ♔h2-g3 ♖b7-e7 ♔g3-f3 ♖e7-e8 d4-d5 ♖e8-d8 ♖e1-d1 ♖d8-e8 ♔f3-f4) +3.32/20 114)

score +3.32 depth 20

Dec-30-16  The Kings Domain: Tough, deep puzzle and great game.
Dec-30-16  varishnakov: First thing that suggests itself is a knight sac at f7. And the natural move is a recapture of the pawn with the rook, and the threat of a discovered check. But black has a defensive move that seems to hold the position.

18.NxKBP KxN 19.RxP N-Q4 blocking the bishop's attack

20.RxBP removing the defender ----

20...RxR 21.BxN+ wins back a rook --21...R-K3 22.BxR

Dec-30-16
Premium Chessgames Member
  YouRang: Friday 18.?


click for larger view

I spotted pretty quickly that white's LSB and Re1 both converge on Pe6, which is supported only by Pf7, which in turn is supported only by black's king. Furthermore, my Ne5 is blocking my rook and attacking that Pf7. Naturally, the move that jumps out is <18.Nxf7>, undermining the now doubly attacked Pe6.


click for larger view

Starting with the (unclear) assumption that black takes the knight via <18...Kxf7>, we are now in position to take Pe6. But with which piece?

My first inclination (based just on experience) that its often stronger to take with the piece that doesn't give check (the rook in this case). This opens the door for further tactics like discovered check (e.g. windmill) or double check. So, trying <19.Rxe6>:


click for larger view

And this does indeed produce some juicy threats:

- If the K remains on f7 and the N remains on f6, then Rxf6++ (double-check) wins back the piece to go with the 2 pawns, with further attack to come.

- If the 19...Kf8 (unpinning), then the Nf6 loses a defender, thus Bxf6 wins.

So black needs to consider knight moves:

- If <19...Ne5> blocking my LSB,


click for larger view

This took a moment, but white can undermine the N with <20.Rxc6! Rxc6 21.Bxe5+> winning back both the N and R (plus another pawn).

- If <19...Nd7> then Re7+ and Rxd7 next.

- If <19...Ne8> then 20.Re5+ Kf8 21.Be7#

- If <19...Ng8> This is another "thinker", but the forcing moves aren't too hard to find: <20.Re7+ Kf8 21.Rf7+ Ke8>


click for larger view

I was stuck here for a moment until I remembered that I had another rook! <22.Re1+!> with just some futile blocks until mate.

- If <19...Nh5> then 20.g4 and the N has nowhere to go.

- If <19...Ng4> (stupid) then 20.hxg4.

- If <19...Nd4> (also stupid) 20.Rxe4+.

Now, if black doesn't take the N, I don't think he actually avoids trouble because I still have Rxe6!. Guarding e6 (18...Re8) is pointless since it's double attacked. I think I should be happy.

Dec-30-16  JASAHA: There is a discrepancy in the move order compared to Fischer's analysis "That alone makes Fischer's notes worthy of study. Already after the initial moves 1.e4 g6 2.d4 Bg7, I learned something new.

Fischer: The Pirc defense, also called the 'Rubbish' or 'Rat' defense because of the cramped but fighting game it gives Black. The game continued 3.Nc3 c6 4.Nf3. Here Fischer gave a relatively detailed analysis of the alternative 4.Bc4. Why spend this effort on the fourth move? Due to Black's having avoided ...Nf6, the game has already branched off into less charted territory, which Fischer obviously thought was important. After the further 4...d5 5.h3, White's fifth is the sort of move that sometimes gets a '?'. Fischer gave it a '!'."

Dec-30-16  SpamIAm: Faster than 20.Rf6+ as in the game was 20.Re5+(or Re4/Re3/Re2/Re1)Kf8 21.Be7++. But I think everyone already realizes this, though no one has actually posted the moves.
Dec-30-16
Premium Chessgames Member
  Capacorn: <Abdooss: Chessgame.com shows Fischer's analysis of this game here --- < http://en.chessbase.com/post/did-yo... >>

Thank you for posting this link, Abdooss. I'd read about Bobby's "Boy's Life" columns, but never actually saw one myself. It was great to read Fischer's notes. He had a real knack for shedding light on the game. Such a pity he wrote so little on chess. Directly after enjoying your link, I checked to see if an English language version of Gardar Sverrisson's "Bobby Fischer's Final Years" had been printed. It has not. But as luck would have it, I stumbled upon "Checkmate: Bobby Fischer's Boys' Life Columns," which I immediately ordered. The book was only published last month, so it's rather serendipitous that I happened upon this puzzle, and your link, when I did.

Dec-30-16
Premium Chessgames Member
  chrisowen: Map bat f7s flockhug von guv mag luv f7s floodbug o dunkvons 18...Nd5 gobs dnkus 3 oust o rookhung 18...R8 gobs it's evemores von guv thous 3 ousts o e6s it's i eveoffs von guv thou hud e8s it's i evemores von guv thous o lunkvows 19...N8 buds doorus hunk hud mates 2 it's i evermores von guv thous o dunkvowus 19...Nd4 bunk doorus 3 oust veto nip boot 20.Rf6+ hoofs fluffus von guv thous bud mate ave 3 oust pms bat hat v blush f7 flockhug gos work rungs flungs cent c nuke it's i eve von nguv thou joy duz it's i vam luv thou date vows whippy it's i wait vam luv von guv vow dippy it's i vam luv von guvs wade ploy weft yip von add few pity poof luv you f7s flockhug prom hub bat v ons guv pms vow mouth hub blush bat ats tvs gov god oink veto nip boot 20.Rf6+ hoofs fluffus von guv thous bud mate ave 3 oust pms bat hat v blush f7 flockhug vims wind work row vigil tag v rugs flunk flows luck cent vent nuke it's eve von guv ukelele e8s it's i evermores von guv thous o clungof 17...Rfc8 you honk v churchmop oks von guvs thou 3 ousts o ukelele 17...Rf8 you honk it's i evermores von guvs thou 1 oust yum bud joy duz it's i vam luv thou date vows whippy it's i wait vam luv von guv vow dippy it's i vam luv von guvs wade ploy weft yip von add few pity poof luv you f7s flockhug hove for won bet proof couths bud dunk doors lug cup gutoff bud fly gunghos o hug it's i eves von guv thous bud hug it's i eves von guv thou c8s churchmop oks von guvs thou 3 ousts o ukelele 17...Rf8 you honk it's i evermores von guvs thou 1 ousts o dunkoff huff von guv cup f6s fluffus von guv thous bud mate ave 3 ousts f6s finishy bud crud bug grub uvs i oomph job bug clungus o it's i eve von guv thous buffon lunk vet nip boot grubs uvs von guv thou bungs bud it's i avows von guv thou bug it's i ave avowly lug it's i eve von guv thous o clungof 17...Rfc8 you honk churchmop oks von guvs thou 3 ousts o ukelele 17...Rf8 you honk it's i evermores von guvs thou 1 oust yum bud joy duz it's i vam luv thou date vows whippy it's i wait vam luv von guv vow dippy it's i vam luv von guvs wade ploy weft yip von add few pity poof luv you f7s flockhug lunks e6s it's i eveoffs von guv thous o it's i eggof it's i ebbly it's i eveof c8s you honk churchmop oks von guvs thou 3 ousts o ukelele 17...Rf8 you honk it's i evermores von guvs thou 1 oust yum bud joy duz it's i vam luv thou date vows whippy it's i wait vam luv von guv vow dippy it's i vam luv von guvs wade ploy weft yip von add few pity poof luv you f7s flockhug o floodbug.
Dec-30-16
Premium Chessgames Member
  chrisowen: 18.Nxf7 Kxf7 gob bug grub uvs god bung goof bug hog but von guv hug bunk c8s you honk churchmop oks von guvs thou 3 ousts o ukelele 17...Rf8 you honk it's i evermores von guvs thou 1 oust jog but glock bum gungho but ghost bug gut bung gowrot bus guy oblongs won guv f7s flockhug floodbug forsungs fogbunks founthug foodhung flophoot v hogs ums v iffys o fog gave hogs o e6s it's i eveoffs von guv thous o f7s fordhung flosshut v hogs hoods o foothuvs fowlbung fog goof guff huff it's i eve von guv thous o clungof 17...Rfc8 you honk churchmop oks von guvs thou 3 ousts o ukelele 17...Rf8 you honk it's i evermores von guvs thou 1 oust ghost ghoul flung gog hung hong kong phooy flush hoof gungho f7s flockhug fogs mocks mucks goof flung muff vows hmmm ghosts com mug cog glock forms gust goofly vows o dunkvons 18...Nd5 gobs dunkus 3 oust o rookhung 18...R8 gobs it's evemores von guv thous 3 ousts o fluffhung 19.Rx6 N8 buds doorus hunk ave lob hud mates 2 it's i evermores von guv thous o dunkvowus 19...Nd5 bunk doorus 3 oust veto nip boot 20.Rf6+ hoofs fluffus von guv thous ave bud mate ave 3 oust pms bat hat v blush f7 flockhug gos work rungs o flung cent c nuke it's eve von guv thou joy duz it's i vam luv thou date vows whippy it's i wait vam luv von guv vow dippy it's i vam luv von guvs wade ploy weft yip von add few pity poof luv you f7s flockhug rugs uvs uss hud rook e8s it's i evemores von guv thou c8s churchmop oks von guvs thous 3 ousts o rucks runks hmmm gourds focus hunt conc hurry cocks cob clomp it's i eveoff von guv thou plotty choo fob fog coo cod innovate e8s it's i evemores von guv thous f6s fluffus bud mate 3 oust veto nip boot von guv thous hurry round cross god rump flogs foods funs fogs guff flung buff fob bug grub uvs o g5s ghosts ghoul fog grog von flush f6s fluffus cub cob fob flock buck buff v iffys o e8s it's i evermores von guv thou fog gave hogs ums floors f7s flockhug.
Dec-30-16  Sularus: <chrisowen>
exacty.
Dec-30-16  Sularus: another example of exploiting a weak f7 square.
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