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Feldman vs Viktor Korchnoi
Leningrad (1953)
Alekhine Defense: Four Pawns Attack. Trifunovic Variation (B03)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Oct-14-18  Saniyat24: 46...c4 was a great move by Korchnoi, Feldman was forced to take the c-pawn with his b-pawn, and thus Korchnoi got a passed b-pawn. The black knight at the rim at a4 prevented the white rook to go to b7, but Feldman could have tried to take the b-pawn via c8-b8...overall a very nice game by Korchnoi, particularly the end-game...
Oct-15-18
Premium Chessgames Member
  Sally Simpson: ***


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It is a nice end, reminiscent of a famous study/combination, even without the Black Knight that is still a win.

Also note if the White King were on e5 instead of e4 then 50.Ke6 or 50 Kf6 would draw.

***

Sep-07-20  Walter Glattke: No third check (Na5xc6), so 48.-Rxe4 49.Kxe4 b2 50.Rc8+ Kf7 51.Rc7+ Kf6 52.c5 b1Q+ 50.c5 b1Q+ 51.Ke5 Qb2+ 52.Ke6 Qe2+ 53.Kf6 Qe8 54.cxb6 Qd8+ 54.Ke6 Nc4 55.Rxc4 Qxb6+ 56.Ke7 Qe3+ black takes the white pawns and move his own pawns forward, or find better queen moves after transforming
Sep-07-20  geeker: Monday, but no Queen to sac...how can we profitably give up material? First candidate: 48...R:e4 and Queen the b-pawn. It works!
Sep-07-20  Cheapo by the Dozen: Endgame puzzles are commonly about unstoppable pawns.

But yeah, I actually solved things in <geeker>'s order.

Last step: Confirm that there are no perpetual checks. That was easy in this case too.

Sep-07-20  jith1207: I was trying <RookSac - Fork - Capture>

That's not the case here, then noticed the passed pawn.

So <RookSac - PassPawn - EscapeChecks - Promote> it is.

Sep-07-20  perfessor: Only the bishop can stop the pawn. Therefore, RxB.
Sep-07-20  saturn2: The game move is obvious But 48...Re1 also wins
Sep-07-20
Premium Chessgames Member
  agb2002: Black has a knight and a pawn for a bishop.

White threatens Bxg6.

The bishop controls the promotion square. Hence, 48... Rxe4 49.Kxe4 (49.Rc8+ Re8) 49... b2 50.Rc8+ Ke7 51.Rc7+ Kd6 wins.

Sep-07-20  Brenin: Easy Monday! After 47 ... b3, Black's only hope of stopping the b pawn was to give up a piece with 48 Rd7 b2 49 Rd1 Nb3 50 Rb1 Nd2 51 Rxb2 Nc4+ and Nxb2. Earlier, Black's hesitation over capturing the a-pawn (41 ... Rd6 then 43 ... Rd2) allowed White's K into the game, but 45 Ke5 was a step too far: 45 Bd5 would have held up Black's Q-side pawns.
Sep-07-20  Damenlaeuferbauer: After long thinking (as always), the immortal Viktor "the terrible" Korchnoi finally found 48.-, Rxe4! 49. Kxe4 (49.Rc8+,Re8 50.Rxe8+,Kxe8 -+) 49.-,b2 50.Rc8+,Ke7 51.Rc7+,Kd6/Kd8 and the black b-pawn queens. Kortchnoi's most famous game with the Alekhine Defense is his win against Efim Geller at the USSR championship 1960 in Leningrad, which secured him the title. He was always a great "agent provocateur" - in real life as in the game of chess.
Sep-07-20  zb2cr: 48. ... Rxe4 removes the only White piece that can stop the Black b-Pawn. Very easy indeed.
Sep-07-20  TheaN: <48....Rxe4 +-> with these kind of sacs it's always checking if the opponent can't forego the piece and create a defensive situation that may be hard to break.

However, in this case White has absolutely no way to get out of the Black camp: the knight blocks the a-file and defends b7, the c- and d-files are blocked by White pieces, the e-file is Black's, the Black King protects f7 and the king side's not open.

After 49.Kxe4 b2 -+ White's too late, and trying to relocate to b8 (Rc8-b8-b6-b1) fails because 49.Rc8+ Re8 -+ and the White King's always a move too late (and a knight down to boot).

Sep-07-20
Premium Chessgames Member
  chrisowen: 66 ways dupe fledman no?
Sep-07-20  Chris Bennington: Why not 41. . . R x a2 immediately?
Sep-07-20
Premium Chessgames Member
  gawain: No fork or any other cutlery is involved.

Only the bishop is stopping Black's pawn from queening. Capture the bishop, then.

Sep-07-20
Premium Chessgames Member
  Breunor: Chris Bennington, Stockfish agrees 41 .. Rxa2 is best by about .5, it scores a little better than -2.
Sep-07-20  Diana Fernanda: <crís> hello, after 41. rook for pawn comes, 42. rook f7 check, to continue rook d7 threatening mate.
Sep-07-20
Premium Chessgames Member
  chrisowen: Amen to that no.
Sep-07-20  TheaN: <Diana Fernanda: <crís> hello, after 41. rook for pawn comes, 42. rook f7 check, to continue rook d7 threatening mate.>

That's probably what Korchnoi feared, but this is fruitless. After 41....Rxa2 42.Rf7+ Kg8 43.Re7 (more practical as the knight can't cover e8) Rf2 with Rf8 and Black retreats in time, leaving Pb3 weak. That's why 41....Rxa2 does work, Korchnoi's 41....Rd6 removes the counterplay but White can hold more sturdy with 42.Bb1! ⩱.

Sep-07-20  Nullifidian: The white bishop is the only thing controlling the queening square on b1 so 48... ♖xe4 49. ♔xe4 ♙b2 and nothing can stop the pawn promoting.
Sep-07-20  Mendrys: With moves like 37...Rg4 and 41...Rd6 it is apparent that Korchnoi didn't want the bishop on g6 though I'm only guessing that he played 42...g6 to give his king a little room by offering up the pawn. It didn't matter as long as he was able to carry out his plan on the queen side of the board. It's interesting how the knight on a5 is well placed for the coming c4!.

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