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Jan Hein Donner vs Carel van den Berg
Hoogovens (1959), Beverwijk NED, rd 4, Jan-11
King's Indian Defense: Fianchetto Variation. Double Fianchetto Attack (E64)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Sep-22-22
Premium Chessgames Member
  al wazir: I wanted to play 50. a6 instead of the key move 50. a3, which I overlooked. Black can stop the ♙ from promoting by playing 50...Kc7, but white can still win by playing f3 now: 51. f3 Re3 52. Bxe3 fxe3 53. b4 Kb6 54. b5, etc.
Sep-22-22
Premium Chessgames Member
  al wazir: If white doesn't play either 50. f3 or 51. f3, black wins, e.g., 50. a6 Kc7 51. a7 Kb7 52. f3 (52. Kd2 f3!) Rd4+! 53. Bxd4 exd4 54. c5 (54. Kd2 c5 55. Kd3 Kxa7 56. b4 Ka6) Kxa7 55. b4 Ka6 56. Kc2 Kb5 57. Kb3 .
Sep-22-22  jrredfield: Very obvious to me with the Black rook essentially trapped. I saw 48 Rxe7+ in a few seconds. As others have stated, there is considerable work for White to reach the finish line, but eventually the left side pawns prevail.

White has to prevent 48 ... fxe3 49 fxe3 Rxe3 giving Black the material advantage and an army of passed pawns. So moves like 48 Rc7, 48 Ra6, 48 a6 won't work. By taking advantage of Black's useless rook and keeping the King in check with the Bishop if the King captures the rook, or being able to free the Bishop if Black declines the capture keeps White in command.

Sep-22-22  nalinw: I got the first two moves - but jumped to the conclusion that the a pawn would Queen - never saw the Rook being trapped
Sep-22-22
Premium Chessgames Member
  agb2002: Black threatens fxe3.

The black rook lacks mobility. This suggests 48.Rxe7+ Kxe7 49.Bc5+ Kd7 50.f3:

A) 50... Rd4+ 51.Bxd4 exd4 52.b4

A.1) 52... c5 53.bxc5 Kc6 54.a6 g5 (54... Kxc5 55.a7 wins) 55.Ke2 Kc7 56.Kd3 Kc6 (56... g4 57.fxg4 f3 58.g5 f2 59.Ke2 d3+ 60.Kxf2 wins) 57.Kxd4 wins.

A.2) 52... Kd6 53.Ke2

A.2.a) 53... c5 54.bxc5+ Kxc5 55.Kd3 g5 56.Ke4 wins (56... Kc6 57.Kxd4; 56... g4 57.fxg4).

A.2.b) 53... g5 54.Kd3 g4 (54... c5 55.bxc5+ transposes to A.2.a) 55.fxg4 and one of the passed pawns will promote.

A.3) 52... g5 53.Ke2 as above.

B) 50... Re3 51.Bxe3 fxe3 52.b4 looks even easier for White than A.

Sep-22-22
Premium Chessgames Member
  agb2002: I forgot to mention 48... Kd6 (instead of 48... Kxe7) 49.Bb6 Kxe7 50.a6, winning.
Sep-22-22
Premium Chessgames Member
  RadioBoy: I prefer 52. c5. b4-b5 allows c5 which seems to give black a protected passed pawn and a draw.
Sep-22-22  saturn2: 48.Rxe7

48...Rxe7 Black threatens fxe3 or f3 and there are various ways for the rook to reach a8 before the pawn.

Therefore 49 Bc5 Kd7 50.a6 I play f3 one move later as others.

If 48...Kd6 49. Bc5 does not work but 49.Bb6

Sep-22-22  Brenin: <RadioBoy: I prefer 52. c5. b4-b5 allows c5 which seems to give black a protected passed pawn and a draw.>

52 b4 c5 53 a6 Kc6 (or Kc7) 54 bxc5 is an easy win for White. However, 53 b5 Kc7 leads to a draw

Sep-22-22
Premium Chessgames Member
  scormus: The key feature of this position is the constricted BR. After 48 Rxe7+ Kxe7 49 Bc5+ Kd7 (I think) W can imprison the BR with 50 f3, and force ... Rxc5, with a winning endgame. I don't think it wins if W doesn't play 50 f3, when B can free the R by 50 ... f3 and 51 ... Re2.

I usually have trouble with endgame puzzles, but today is clear cut and it's nice to get it.

Sep-22-22
Premium Chessgames Member
  Dionysius1: <alshatranji: Not very difficult, but novel and quite entertaining. It brought a smile to my face.> Mine too
Sep-22-22  saturn2: <48. Rxe7 Kd6 49. Bc5 does not work>

Well the machine says it does work but white has to find <50.Rd7> and <53.Kd2> while 53 Kc2 is only a draw.

48.Rxe7+ Kd6 49.Bc5+ Kxc5 50.Rd7 f3 51.a6 Rh4 52.a7 Rh1+ 53.Kd2 and white gains the Pf3 etc

Sep-22-22  TheaN: <EasilyConfused: 50 a6 is also very good, the pawn will queen even though the rook escapes>

I think you misunderstand that line. It just delays the rook trap. After 50.a6, Kc7 or Kc8 stops the pawn after which only 51.f3 wins. It misplaces the a-pawn, so 50.f3 is simply better.

Sep-22-22
Premium Chessgames Member
  scormus: Not quite a clear cut as I first thought ...

<Thean> Yes!
50 a6 Kc7 51 a3 still wins, but W has effectively lost a tempo, so there is a bit more work to do

Sep-22-22
Premium Chessgames Member
  steinitzfan: This must be an easy Thursday. I was able to get it.
Sep-22-22
Premium Chessgames Member
  chrisowen: I sames paced its botch Rxe7+ alive gog its a ducky nocky bob tab anaconda koine act jag o quo Rxe7+ go;
Sep-22-22  TheaN: Wouldn't you frikkin' know, <52.b4 c5 53.b5?!> is <actually winning> for White. Absolutely bonkers, but it is.

I got to it by researching the lines with an early a6, it came on the board and pressed analysis and suddenly saw +6.

48.Rxe7+ Kxe7 49.Bc5+ Kd7 50.f3 Rd4 51.Bxd4 exd4 52.b4 c5 53.b5?!


click for larger view

At first glance, the double passers look very dangerous. However, because Black has a passer and a breakthrough threat, it <seems> this is drawn.

No. It isn't. <53....Kc7 54.Kd2 Kb8 55.a6 Ka7 56.Kd3 Kb6 57.Ke4 g5 58.Kd3 Ka7> so far, Black has done what they intended. Block the passers.


click for larger view

Most of us will probably have looked at this result and considered neither color can make progress.

<59.?> White to play and win.

Sep-22-22
Premium Chessgames Member
  chrisowen: Quick Kc2
Sep-22-22  Brenin: <TheaN>: In your line White can triangulate (Kc2-d2-d3), while Black cannot (otherwise b6), so White can reach a position with Ks on b6 and e4 with Black to move. Then 62 ... Ka7 63 Kd5 Kb6 (63 ... d3 64 Kc6 wins) 64 Kd6 d3 65 a7 d2 (65 ... Kxa7 66 Kc7 wins) 66 a8=Q d1=Q+ 67 Ke7 leaves White a P up in the Q & P endgame, but is that enough to win?
Sep-22-22  AlicesKnight: Found this fairly quickly with the Black R limited in scope. The Black Ps are weaker than the White ones after the pieces come off.
Sep-22-22  Refused: Not that dificult once you see, that the black rook is short of squares.

My first brief attempt was the idea 48.Ke2.49.(K)f3 that obviously doesn't work, as 48...fxe3 gives the rook an escape route.

Second try was the game line.

48.Rxe7+ Kxe7 49.Bc5+ Kd7 (or anywhere else) 50.f3 Rd4 51.Bxd4 exd4 and the white pawns on the queen side mean, this is easily 1-0 Altho I went 52.a6 instead of b4 which shouldn't make much of a difference

Sep-22-22  King.Arthur.Brazil: The King (me) saw the line: 48. ♖xe7+ ♔xe7 49. ♗c5+ ♔d7 50. a6 ♔c7 51. f3 ♖d4+ 52. ♗xd4 exd4 53. ♔d2 ♔b6 54. ♔d3 ♔xa6 55. ♔xd4. I guess the white win this position without much work. For example: ♔a5 56. ♔c5 g5 57. b4+ ♔a6 58. ♔d4 g4 59. fxg4 f3 60. ♔e3. Time to check out.
Sep-22-22
Premium Chessgames Member
  RadioBoy: <Brenin>
RadioBoy: I prefer 52. c5. b4-b5 allows c5 which seems to give black a protected passed pawn and a draw.> <Brenin> 52 b4 c5 53 a6 Kc6 (or Kc7) 54 bxc5 is an easy win for White. However, 53 b5 Kc7 leads to a draw

I meant 52. b4 Kc7 53. b5 c5, not 52. b4 c5.

Sep-22-22  Brenin: <RadioBoy: ... I meant 52. b4 Kc7 53. b5 c5, not 52. b4 c5.>

Thank you, that wasn't clear from your posting. After 52 b4 Kc7, instead of 53 b5, which gives Black drawing chances with 53 ... c5, White should simply march his K forward and capture the d-pawn. If Black tries to protect it with c5 then bxc5 wins.

Sep-22-22  TheaN: <Brenin: <TheaN>: In your line White can triangulate (Kc2-d2-d3), while Black cannot (otherwise b6), so White can reach a position with Ks on b6 and e4 with Black to move. Then 62 ... Ka7 63 Kd5 Kb6 (63 ... d3 64 Kc6 wins) 64 Kd6 d3 65 a7 d2 (65 ... Kxa7 66 Kc7 wins) 66 a8=Q d1=Q+ 67 Ke7 leaves White a P up in the Q & P endgame, but is that enough to win?>

Given we're a bit further, yes, triangulation is the only thing White can try. 59.Kc2! Kb6 60.Kd2 Ka7 61.Kd3 Kb6 62.Ke4 Ka7:


click for larger view

63.Kd5!! (you got to dare this, to be honest) Kb6, allowing Kc6 is indeed lost as the cornered king will be mated before the Black queen can do anything, 64.Kd6!


click for larger view

Black has to make a decision. 64....Ka7 65.Kc7 is just as lost as before. 64....g4 isn't fast enough, 65.a7! Kxa7 66.Kc7 with b6+ etc. So that leaves 64....d3 65.a7 d2! 66.a8Q d1Q+ 67.Ke6:


click for larger view

Black will have to check as else White can win c5 and then configure the queen as such that they are traded and White can clean up the king side and win on the queen side. However, this gives away Pg6, so I think at this point SF is just prolonging the game: 67....Qe2+ 68.Kf5 Qc2+ 69.Kxg6 Qg2+ 70.Kf6 +-:


click for larger view

Black is out of checks, White's a solid passer up and c5 is lost also. SF gives this as +60, so it sees a way to mate already.

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