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Svetlana Matveeva vs Nadezhda Kosintseva
Russian Championship Superfinal (Women) (2007), Moscow RUS, rd 3, Dec-20
Nimzo-Indian Defense: Classical Variation (E32)  ·  1-0



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Kibitzer's Corner
Premium Chessgames Member
  whiteshark: Couldn't spot a blunder. Supior ♗♗ over ♘♘. It just went from bad to worse.
Premium Chessgames Member
  Gilmoy: 15..Be4 looks a little too speculative -- what's the benefit? White has a delightful riposte: 16.Bf1! to preserve her own bishop pair. My half-baked observation of <whomever sacs first, wins> usually applies to material, but 20.e3!? 22.bxc5!? also qualifies -- White "sacs" pawn structure instead, accepting two isolated pawns on c and e (not counting the a-pawn, since Black's a-pawn is equally isolated). White gets tactical compensation: her other c-pawn is mobile enough to cramp Black's position first, forcing a favorable trade, and Black never has time to exploit her e-pawn weakness.

Another proto-idea I have is <plus-minus evaluation>: each chess move really has a plus for all of its strengths, and a minus for all of its weaknesses. To merely sum them into a composite score perhaps discards useful information. By observation, it's sometimes the case that a sequence of moves gives the opponent no time to exploit any of your minuses -- so all your minuses essentially vanish, and you just have a bunch of plusses. That's the basis of nearly every sacrificial combination. It could also justify White's thinking for those two pawn thrusts -- she can see mild plusses (eliminates counterplay, fixes Black's pawn, battering ram) and "deductible" minuses (trade away, never have time).

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