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Yifan Hou vs Marie Sebag
"Yifan Only If" (game of the day Apr-06-2016)
FIDE Women Grand Prix (2010), Ulaanbaatar MGL, rd 5, Aug-04
Sicilian Defense: Najdorf Variation. English Attack (B90)  ·  1-0



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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Aug-11-10  Octal: Dr. Funkenstein: You don't appear to be missing anything as the threat of 24 Bxa6 is pretty difficult to meet. 23 ... Nc5 24 Nb3 Nfe4 25 Rd4 and 26 Rgd1 will just pile up the pressure. Black doesn't seem to have any useful moves (25 ... Nxb3 26 axb3 Bc5 27 Rd8+)
Aug-11-10  Gilmoy: <Dr. Funkenstein: 22..Rb7 23.Bf4> Now White threatens 24.Bxa6, so the Rb7 line seems to still commit Black to 23..Rxc7 24.Bxc7 Rxc7 25.b3. The alternative 22.Ra8 is just toothless.

Also, g5 looms, so Nd7 will-be-hanging.

Black already gave up on the K-side several moves ago. Critically, giving up her b-pawn eliminates her Q-side storm threat, whereas White's K-side pawn storm is still very much alive. So she must keep her Q in play.

Premium Chessgames Member
  Richard Taylor: 15. ... Qxc4 is better and also 13. ... Bxb3 then Nc5 is better - I play both sides of this and it is always leads to spectacular games. Easy for either side to go wrong.

Neither of these players played passively is for sure!

Aug-11-10  screwdriver: Good patience by white. And definately resignable with Qc6+ on the immediate horizon.
Aug-11-10  C4gambit: why not 20...Bxd6?
Aug-11-10  C4gambit: oh... to keep the e4 pawn alive
Aug-11-10  asiduodiego: Nice Sicilian game. The classic pattern of black racing towards the Queenside and white racing towards the Kingside. In this case, it was a great defense by Hou. Around move 20, Black seems to have a great attack on the Queenside, but, White boldly refutes every attempt to breakthrough, and launches his own decisive attack on the Kingside.
Aug-11-10  David2009: <C4gambit: why not 20...Bxd6? oh... to keep the e4 pawn alive> Yes, but the complications may favour Black e.g. 20...Bxd6 21.Nxe4 Nxe4 22.Qxe4 Bxh2 23.Rh1 Nf6 24.Qg2 Qxc4 25.Qxh2 Qxg4

click for larger view

and now if 26.Rdg1 Rxb2+! 0-1, so 26. Bc1 with an interesting endgame in prospect.

Not playing 21. Nxe4 seems worse e.g. 21.Qe2 Bxh2 22.Rh1 Be5 23.Bb3?

click for larger view

...Qxc2+! 0-1

Crafty End Game Trainer free on-line Internet link to the position with White to play 20?: You are white, drag and drop the move you want to make. Enjoy!

Aug-11-10  lzromeu: The sky is green if and only if the ocean is yellow - TRUE
Aug-11-10  Lil Swine: maybe u should barf in a sebag.. pun
Aug-11-10  morphynoman2: I think 32. Qxf8! Kxf8 ans 33. g7 wins too, and beautifully.
Premium Chessgames Member
  HeMateMe: < "if and only if," > all fine and well. But--it has nothing to do with the game that was played.
Premium Chessgames Member
  kevin86: Mate will come soon...
Premium Chessgames Member
  KWRegan: I agree with the FIDE official site and the ChessBomb live transmission and ChessBase Big 2013 that the move 36.Qc6+ was played on the board.
Premium Chessgames Member
  offramp: If you look at the Games Collections below you will see that this is a repeat pun.
Apr-06-16  morfishine: Pack your seabag Marie
Premium Chessgames Member
  AylerKupp: <Once> Is there any truth to the rumor that <chrisowen> wrote that Wikipedia article about "if and only if"?
Premium Chessgames Member
  kevin86: White is about to mate in two; 36 ♕c6+ ♔f7 38 ♕g6#
Apr-06-16  Castleinthesky: Hou-itzer Blasts Through?
Apr-06-16  HowDoesTheHorsieMove: Pun? What pun? I see no pun here.
Premium Chessgames Member
  offramp: The avatar of <Castleinthesky: (Hou-itzer Blasts Through?)> is of Marty Feldman in the <Mel Brooks> film Young Frankenstein.

The <HowDoesTheHorsieMove: Pun? What pun? I see no pun here> comment includes a Gene Wilder quote from the <Mel Brooks> film The Producers.

Premium Chessgames Member
  Richard Taylor: <Once: Here is Wikipedia waxing lyrical about "if and only if" "In logic and related fields such as mathematics and philosophy, if and only if (shortened iff) is a biconditional logical connective between statements. In that it is biconditional, the connective can be likened to the standard material conditional ("if") combined with its reverse ("only if"); hence the name. The result is that the truth of either one of the connected statements requires the truth of the other, i.e., either both statements are true, or both are false. It is controversial whether the connective thus defined is properly rendered by the English "if and only if", with its pre-existing meaning. Of course, there is nothing to stop us stipulating that we may read this connective as "only if and if", although this may lead to confusion.">

This is a bit verbose but lets say they say a --> b c --> b

then a ---> c

The logic might be mathematics or something so in some cases it doesn't work or isn't true if any number is zero (for whatever reason). So they say. this is true 'if and only if' any variable is not = zero...

Why it isn't said in the the logic referred to above I forget, but they are saying that 'if and only if' is (or can be in certain cases) really redundant. In other words all you have to say is 'if'. In most cases it is a language problem. When you say to many people "If we are in another universe where there is no gravity..." and you are trying to make a point: many people ignore the if.

But I suppose, for those of us who are confused, then if we here if and only if it means there is no doubt. (No doubt?)

A play on words, it is all in a book I have on the intodruction to philosophy (of course it's a very large book!) but I have forgotten why it has to be 'if and only if'....the problem is they should give a number of fairly simple examples....So, yes, it is confusing if you don't have examples. Not that any of it matters!

It is the kind of tautology lawyers and satirists love playing with....

Premium Chessgames Member
  Richard Taylor: I suppose it means that if the a ---> c
is proving the truth of c then if is true if a is true and b is true. If both are true we can proceed.

Logic analogous to this can be applied to computer science (or digital electronics) as well as to philosophy or pure logic.

When I met GM Lembit Oll he was studying Logic, he said. I said I had done a paper in it and some philosophy papers (this was about 1993 I think) and he said, but I am studying computer science, or something, whereas I was just learning things...But I suppose he was going into the deeper sides of logic. Some of it was beyond me.

I past the exam, but part three was on this complicated logic. Luckily this part (on 'predicate logic' I think it was called) where I missed lectures had one question buried in all the logic stuff (it was say Q.5 (d)! -- and it was the very last: 'The question of the existence of God has been debated for thousands of years, some claim the truth or not of this can be proved (disproved). Discuss.'

So it was a green light. All I had to do was discuss this and get 50% It was a life saver!

Apr-06-16  Ron: I think today's pun is a pun on a rule of inference in philosophy and mathematics. Its called: If and Only If. Wikipedia article here:
Apr-07-16  Moszkowski012273: 13.Rg1... looks a little slow. I wonder if the immediate g4 was considered.
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