Salomon Flohr vs Tigran Petrosian (1950)

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Salomon Flohr vs Tigran Petrosian
USSR Championship (1950), Moscow URS, rd 9, Nov-24
King's Indian Defense: Orthodox Variation. Positional Defense Closed Line (E94) · 1/2-1/2

ANALYSIS [x]

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Apr-20-14		Sourav: By playing 11.Nb3, white gives up his good bishop on c1 for black's bad bishop on h6. But, was it possible to not move the Knight? I think that white would have had to move the Knight sooner than later because there is no way of breaking the pin that the black bishop on h6 imposes on the white Knight on d2 against the white bishop on c1. Is the above analysis correct? If yes, then 10... Bh6 was a very good move.

Apr-21-14		SimonWebbsTiger: @<sourav> not necessarily because the dark squared bishop can be a useful defensive piece for Black in the King's Indian. Its exchange can leave Black in trouble. This line, though, it is OK. Petrosian himself played it with White the year before v. Geller!

Apr-21-14		SChesshevsky: <Sourav: By playing 11.Nb3, white gives up his good bishop on c1 for black's bad bishop on h6.> A lot of what was going on has to do with a typical KID battle of the c5 square. If Black can plant a N safely there its a good advantage, as seen in this game. Petrosian takes the first chance he gets with 8...Nc5. White chooses to protect the e-pawn under double Knight attack with 9. Nb2 which gives Black time to protect the lead N with 9...a5. So White plays 10.Qc2 to protect the e-pawn and free the N to challenge c5 square. 10...Bh6 wasn't taken lightly but it does get rid of a c5 threat either way N or B. It does weaken Black's Kside but it appears White's on the defense so it's probably worth it. After 11...Bxc1, 12. Raxc1 lets Black defend c5 with 12...Nfd7. Then Black eliminates the other threat to c5 and ends up posting a N there with tempo against the Queen anyway. This allows Black the usual KID Kside attack with a lot of pressure on e4 square and f-file which in this game wins pretty quickly.

Feb-01-22		Ziryab: Ludek Pachman, "Modern Chess Strategy", trans. Alan S. Russell gives the continuation as 12.Nxc5 Bh6 (18). Does anyone have reference to a tournament book or other authoritative source concerning this game score?

Feb-01-22		Z truth 000000001: <Ziryab> the score given here (with 12.Raxc1) matches the tb: <XVIII первенство ссср по шахматам - <С. Флор--Т. Петросян> (R9) G-81 p163> A fuller ref to Pachman would have saved me a little time - given I was flipping through, page by page, trying to find the Flohr game. (It wasn't in the game index.) A bit tedious, so I soondecided to do a google search - which yielded the source directly! https://books.google.com/books?id=B... Oh the irony! (aka OCR wins again) <ziryab>'s ref comes from a note in <Sakellarpoulos--Boleslavski (Helsinki 1952) p18> for 10...B-R3!! (a bit exuberant) concerning good vs bad bishops. And yes, Pachman seems to suggest Flohr played 12.Nxc5. Perhaps in a different game with Petrosian (given no particulars of the sidenote game is given other than the players)? Let's do a tree search with SCID to see... OK, it seems Pachman got it wrong. The earliest KID with this position: click for larger view is <Petrosian--Geller (Moscow 1949)>, according to <Millbase>. Petrosian was the one to play 12.Nxc5, next year, Flohr played 12.Raxc1 for the first time. Side note: 12.Raxc1 seems more natural to me, and is far and away the dominant continuation in <Millbase>. But analysis seems to suggest (in agreement with Pachman(?)), that White has full flexibility to take with either rook, or to even play as Petrosian did in 1949. .

Feb-01-22		Ziryab: <Z truth 000000001> I gave the page number and the edition. How much more full of a reference do you need? I also found the Petrosian -- Geller game after posting. It seems that Pachman's notes mixed up two Petrosian games.

Feb-01-22		Z truth 000000001: <. How much more full of a reference do you need?> I'm not used to your conventions (the unadorned 18 - I just missed as I went searching), and it would certainly be helpful to know it was a side note and not quoting the main game.

Feb-01-22		Z truth 000000001: Oh yeah, and you're welcome for the Russian ref.

Feb-01-22		Ziryab: When you see a two digit number after a title, do you assume it is a typo? See <Chicago Manual of Style>.

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