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Erich Eliskases vs Jaime Emma
Argentine Championship (1958), Buenos Aires ARG, rd 4, Jun-06
Four Knights Game: Scotch Variation. Accepted (C47)  ·  1-0

ANALYSIS [x]

FEN COPIED

Annotations by Stockfish (Computer).      [35437 more games annotated by Stockfish]

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Kibitzer's Corner
Feb-28-23  Brenin: Another easy POITD: 36 Rxd7 and either of 36 ... Qxd7 or Rxb7 allows a back rank mate.
Feb-28-23  Cheapo by the Dozen: I love Tuesdays!

The key is ensuring that the back rank mate threat is for real, in that Black's queen can defend neither by capturing the checking piece nor by interposing safely at f8. The rook capture of the bishop gets that done.

Feb-28-23  King.Arthur.Brazil: Easy indeed: 36.Rxd7 Qxd7 37.Qb8+ and mate next.
Feb-28-23  Mayankk: 36 Rxd7 and the ensuing back rank mate is easy enough to spot once you see that the Black King has no escape squares with the h7 square taken away by the White light-squared Bishop.

Black tried to wreck White's pawn structure by allowing bxa5. In the process it gifted White two passed pawns, although isolated, and none for itself. It may have been better placed to attempt axb5 instead, as that would have given it a passed d pawn of its own and a ray of hope. The position after 28 a6 looked utterly hopeless otherwise with no initiative left.

Feb-28-23  raju17: There appears another line; any comments?

36. Qxa7
Qxe7
37. Bf5
Qe1+
38. Kh2
Qe5+
39. g3
Qxf5

Feb-28-23  raju17: If 37 Q a8/b8 + Q f8 or B e8 prevents mate
Feb-28-23  jrredfield: Easier for me than yesterday. After 36 Rxd7, Black's best stall tactic is 36 ... Ra8. But even then, with 37 Rd8 it's mate in 18 for White.
Feb-28-23  saturn2: 36. Rxd7 threatens backrankmate by queen and rook. 36...Ra8 is senseless.
Feb-28-23  agb2002: Black threatens Rxb7 and Qxe7.

The black queen is overburdened with the defense of the bishop and the back rank. Therefore, 36.Rxd7:

A) 36... Qxd7 37.Qb8+ and mate next.

B) 36... Rxb7 37.Rxd8#.

C) 36... Qa8(e8) 37.Qxa7 wins decisive material.

Feb-28-23  mel gibson: Black had back rank trouble.
It took me longer than it should have to see this one - about 30 seconds to work it out.

Stockfish 15 says:

36. Rxd7

(36. Rxd7 (♖e7xd7 ♖a7-a8 ♖d7xf7 ♕d8-g5 ♖f7xg7+ ♕g5xg7 ♕b7xa8+ ♔g8-f7 ♕a8-a7+ ♔f7-g8 ♕a7xg7+ ♔g8xg7 a4-a5 ♔g7-f6 a5-a6 c6-c5 a6-a7 c5-c4 ♗d3-c2 ♔f6-e5 a7-a8♕ ♔e5-d6 ♕a8-d8+ ♔d6-c6 ♗c2-a4+ ♔c6-b7 ♕d8xd5+ ♔b7-b6 ♕d5-c6+ ♔b6-a7 ♗a4-b5 ♔a7-b8 ♗b5-a6 h6-h5 ♕c6-b7+) +M18/57 524)

White wins _ mate in 18.

Feb-28-23  TheaN: Back rank issues demolish Black entirely. After <36.Rxd7!> both pieces are immune: 36....Rxb7 37.Rxd8# and 36....Qxd7 37.Qb8+ with QxQ#. To make matters worse, White is attacking both the queen and rook, so after <36....Qa8 37.Rxa7 +-> and Black lost rook and bishop in two moves.
Feb-28-23
Premium Chessgames Member
  chrisowen: I mock quibble dr its watch jif v zulu Rxd7 abluff frazzle doh its axiom jug gob Rxd7 etc :)
Feb-28-23  Andrew Chapman: If Black sees the danger and plays 35.. Be6 or Be8, then Bg6 wins.
Feb-28-23
Premium Chessgames Member
  chrisowen: I encounter, 808 Rd7 :)
Feb-28-23  AlicesKnight: Needed two looks to see that Rxd7 is OK after all; if the recaptures then a back-rank Q check mates because the White B covers h7, and even .... Qa8 fails to protect the Black R.

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