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Ni Hua vs Mikhael Mchedlishvili
World Team Championship (2005), Beer Sheva ISR, rd 5, Nov-05
Nimzo-Indian Defense: Saemisch. Capablanca Variation (E29)  ·  1-0


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Kibitzer's Corner
Nov-06-05  notyetagm: 36 ♖e7+! should go into the tactics books as a straightforward example to explain what an in-between check (<zwischenschach>) can do. The point of the <zwischenschach> 36 ♖e7+ ♔f8 is to leave the Black d8-rook undefended to create a skewer threat along the 8th rank. Then when White plays 37 ♖xh7 there is now the <double threat> of 38 ♖x♘ and also the backrank skewer 38 ♖h8+ ♔f7 39 ♖x♖. If White had just taken the h-pawn immediately with 36 ♖xh7 then only the undefended Black h5-knight would have been threatened so that single threat could have been met.

The <zwischenschach> 36 ♖e7+ thus allows White to create a <double attack> which regains his sacrificed knight, leaving him two pawns ahead. A very instructive example.

Nov-06-05  Petrocephalon: That really is a nice example, notyetagm. 37..Ke8 is forced, so white recovers the knight with a passed pawn to the good.

Wheras if 36.Rxh7 immediately, then there's the desparado 36..Ng3+ 37.hxg3 (or the amusing silliness of 37.K~) fg, which may be even, or at any rate a much smaller advantage.

Nov-07-05  notyetagm: Glad you like it, <Petrocephalon>. I was struck by the simplicity of the move. The difference between 36 ♖e7+! ♔f8 37 ♖xh7 and 36 ♖xh7 is profound but easily understood. Like I said above, I hope this example makes it into future tactics books on the subject of <inbetween moves>.
Mar-26-06  dakgootje: <notyetagm> Thanks for that explanation as i hardly ever understand the ideas behind <zwischenschach>'s (which is probably mainly because never ever anyone explained them to me ;-)
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