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1. Rb3! Qa5(1… Qa4? 2.Qd6+ Kf7 ( 2…Ke8 Nxf6+ gxf6 Rxa4+-) 3. Ng5+ Kg8 4.Rxa4 bxa4 5.Rb8 +-) 2.Qd6+ Kf7(2…Ke8 3.Qc6+ Bd7 4.Qxa8+ Qd8 5.Nd6+ Ke7 6.Qxd8+ Kxd8 7.Nf7+! Ke7 8.Nxh8 +-)3.Ng5+! Kg8(3…Ke8 4.Qc6+! Bd7 5.Qxa8+ Qd8 6.Qxd8+ Kxd8 7.Nf7+ Ke7 8.Nxh8 +-)4.Qe7! Qe1+5.Rf1! Qxe26.Qf7#Marcelo
1. Rb3 Pretty obvious. After this the Black queen will no longer guard d6-square.1. .. Qa5 Black queen now protects c7 and d8, and also threatens Qe1+ in some variations. 2. Qd6+ Now Black has either 2. .. Ke8 or 2. .. Kf7 2. .. Ke8 3. Qc6+ Ke7 4. Qxa8 Qe1+ 5. Rf1 Qxe2 6. Ng3 (a nice resource) Qd2 7. Qxc8 Ng68. Qxa6 Rd8 9. Rxb5 White is almost a full rook ahead, has good king safety, and a passed b-pawn.2. .. Kf7 3. Rc3 Probably stronger than 3. Ng5+, although 3. Ng5+ looks real tempting and interesting. With 3. Rc3, the rook bears down on the c-file, particulaly onto c7. It also looks possibly to go to g3 in some variations. And on c3 it prevents Black's Qe1+.3. .. Bd7 4. Bh5+ g6 5. Nxf6 Qa1+ (5. .. gxh5 6. Ng8+ Kxg8 7. Qxf8+ Rxf8 8. Rg3#) 6. Bd1 b4 7. Nd5+ Kg8 8. Ne7+ Kg7 9. Qe5+ Kh6 10. Rh4#
Rb3 followed by Qd6+ improves the position a lot, but I don't see anything particularly devastating after that.
Oh, this is based on Khalifman - Ehlvest '88, difference being that black has no bishop in the actual game.
First move is easy to find:1.Rb3 Qa52.Qd6+ Ke8 Or Kf7Not sure how to finish from here.
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