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Mihai Suba vs Ibanez
Badalona Open (1993), Badalona ESP, rd 4, Aug-05
English Opening: Symmetrical Variation. Hedgehog Defense (A30)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Dec-22-21  landshark: That was fast.
As usual, easy now means indecipherably difficult soon (:
Dec-22-21  Brenin: 21 Bxh7+ Kxh7 22 Qf7+ Kh6 (otherwise 23 Rh4 mate) 23 Rh4+ Kg5 24 Rh5+ Kg4 25 h3 mate, or 21 ... Kh8 22 Qf8+ Kxh7 23 Rh4+ Kg6 24 Rh6+ Kg5 25 h4+ Kg4 26 Qf3 mate, or 21 ... Kg7 22 Qg5+ Kf7 23 Bg6+ with mate in a few moves.
Dec-22-21  mel gibson: I saw that straight away and thought it was a quick mate.

However Stockfish 14 shows that the Black King can escape

and it's mate in 23 moves.

21. Bxh7+

(21. Bxh7+ (♗e4xh7+ ♔g8-g7 ♕f4xe5+ ♔g7-f7 ♗h7-g6+ ♔f7-e7 ♖d4-f4 ♖d8-d7 ♖a1-d1 ♔e7-d8 ♖f4-f8 ♔d8-e7 ♖f8-f7+ ♔e7-d8 c4xd5 ♕c8-c5 ♖f7xd7+ ♔d8xd7 d5xe6+ ♔d7-c8 ♕e5-e4 ♖a8-b8 b2-b4 ♘e8-d6 ♕e4-f4 ♕c5-c4 ♕f4xd6 ♔c8-b7 ♕d6-d7+ ♔b7-a8 e6-e7 a7-a5 e7-e8♕ ♖b8xe8 ♕d7xe8+ ♔a8-b7 ♗g6-e4+ ♕c4xe4 ♕e8xe4+ ♔b7-a7 ♖d1-d7+ ♔a7-a6 ♕e4-d3+ b6-b5 ♕d3-d6+) +M23/54 1091)

Dec-22-21  saturn2: 22.Bxh7 opens the h file for the rook after the queen haa stepped aside with tempo.
Dec-22-21
Premium Chessgames Member
  raymondhow: After the first two moves, my instinct was to play 23.Rh4+ which takes just a bit longer to mate.
Dec-22-21
Premium Chessgames Member
  agb2002: White has a bishop for a knight.

Black threatens exf4, exd4 and dxe4.

The black king is completely exposed and the white pieces have almost complete freedom of movement on the king side. Therefore, 21.Bxh7+:

A) 21... Kxh7 22.Qf7+ Kh6 (else 23.Rh4#) 23.Rh4+ Kg5 24.Rh5+ Kg4 25.Qf3# (or 25.f3# or 25.h3#).

B) 21... Kh8 22.Qf8+ Kxh7 23.Qf7+ transposes to A.

C) 21... Kg7 22.Qxe5+

C.1) 22... Kxh7 23.Rg4 Nf6 (due to Qh5#) 24.Qxf6 and mate in two.

C.2) 22... Nf6 23.Rg4+ Kf7 (23... Kxh7 24.Qxf6 transposes to C.1, else 24.Qxf6+ wins) 24.Rf4 wins decisive material (24... Kg7 25.Qxf6+ Kxh7 26.Rh4+ Kg8 27.Rh8#).

C.3) 22... Kh6 23.Rh4#.

C.4) 22... Kf8 23.Rf4+ Ke7 24.Bg6 Nd6 (24... Kd7 25.cxd5 exd5 26.Bf5+ wins) 25.cxd5 wins three pawns at least.

C.5) 22... Kf7 23.cxd5 (or 23.Rf4+ as in C.4) 23... Rxd5 (23... exd5 24.Rf4+ and mate soon) 24.Rxd5 exd5 25.Qxd5+ wins three pawns at least (25... Kg7 26.Be4 Rb8 27.Kh1 followed by Rg1).

Dec-22-21
Premium Chessgames Member
  parch: Strip away the pawn 21.B:h7+
21...Kg7
(21...Kh8 22.Qf8+ )
(21...K:h7 22.Qf7+ )

22.Q:e5+ Kf7 23.Rf4+ Ke7 24.Bg8 Rd6
25.Rf7+ Kd8 26.Qg5+ Nf6 27.Q:f6 Ke8 28.Qe7#

Dec-22-21  AlicesKnight: Found the basic ideas; it is fascinating that Black cannot easily intervene to rescue the K after Bxh7+ despite the space available.
Dec-22-21  TheaN: This Wednesday has quite a few variations, but I let this one come down to a principled <gain of advantage> rather than a forced line in Black's best defense.

Mainly, after <21.Bxh7+>, White strips down the Black king side even more (there's not much to begin with). The key is that Black cannot take on h7 nor go to h8 due to the same variation: 21....Kh8 (Kxh7 transposes) 22.Qf8+ Kxh7 23.Qf7+:


click for larger view

Though the Black pieces are yelling from the queen side they'll come back, they don't: 23....Kh6 (else Rh4#) 24.Rh4+ Kg5 25.Rh5+ Kg4 26.h3#.

This leaves <21....Kxg7>. I started calculating a lot of ways to gain a crushing advantage. It exists, but then it occurred to me; White's only gaining material and space after <22.Qxe5+ +->:


click for larger view

If Black takes on h7 now (22....Kxh7), 23.Rg4! #3 is the best move, but what doesn't win? Black has no defenders around his king: Rh4+ is #6, Kh1?! is also #6 threatening to get the second rook in the fray.

The alternatives, for example 22....Nf6, exactly bring Black nothing: White's taken on h7 and e5 for free and the king's still out in the open.

Personally, I'd say understanding all lines after <21.Bxh7+ Kg7 22.Qxe5+ +-> isn't necessary. It works and it's rather obvious.

Dec-22-21
Premium Chessgames Member
  Teyss: Feel better after reading <agb2002>'s and <TheaN>'s posts, couldn't find a quick win after 21...Kg7 22.Qxe5+ Kf7 or Kf8.
Dec-22-21  saturn2: 21 Bxh7 Kh8 22.Qf8+ Kxh7 23. Qf7+ Kh6
Now instead of <TheaN's 24.Rh4> 24 Rg4 mates quicker
Dec-22-21  Stanco: <AlicesKnight> queen and rook are extremely strong in open space, bishop sacrifice is there only to unleash them with tempo. One has to have in mind Qf7(+) to solve it, a brutal move.
Dec-22-21
Premium Chessgames Member
  chrisowen: Jah c v its ie out i Bxh7+ hand ago v it quosher block o wobble gave its i out gear rages vis its bird vis mooted its cj v chez its loop plink know its quiff fun its v art elocution its zany guv u vis fuschia its pink how its wig muddle z its back vis miser hand harangue egg huh shagpile v black its do v duck dug hi its awooga jam eg v its eg ha be vis its wall c god deaf fade its heights vis dull manner u cue its dynamo vis chuffer vein adagio nah a doff no vis fit add benny bucked its wood rose bud exorbitant fox moon dt vis its butch flow its woof its ben c z v abe its befriend veil c vis request ref engage vis baba buds batchy chemistry dime its champ vis chad ie c bad v cabs croquet gee q cabby bit z beef von bad touch no bubble vis hag ham n rice its no to aid mach its braid hoof bugs had it skull on nab men it bashful v i no you mind chubb him anno oz trail french but figure von goner i key quiz rien ah 999 its zane low bishop no que got ham ear its kablaam inner que its nebula liz v rid c queen now marvel Bxh7+ eg no?
Dec-22-21  johnnydeep: I saw the move and the theme.
Dec-22-21  AlicesKnight: <Stanco; <AlicesKnight> queen and rook are extremely strong in open space, bishop sacrifice is there only to unleash them with tempo. One has to have in mind Qf7(+) to solve it, a brutal move.> Exactly - well put.
Dec-22-21  King.Arthur.Brazil: I did find the game continuation, however, I preferred to give check mate this time, with: 23. ♖h4+ ♔g6 24. ♖h6+ ♔g5 25. h4+ ♔g4 26. ♕f3#.
Dec-22-21  stacase: <King.Arthur.Brazil ... I preferred to give check mate this time, with: 23. ♖h4+ ♔g6 24. ♖h6+ ♔g5 25. h4+ ♔g4 26. ♕f3#.>

I agree, forced all the way:
Check, Check, Check, Mate

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