(1) Sadorra,Julio (2561) - Iotov,Valentin (2631) [E20]
2011 SouthWest Open , 05.09.2011
[Annotator: Sadorra]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.f3 the Samisch variation of the Nimzo-Indian is known for its combative and imbalanced nature. 4...c5 5.d5 0-0 6.e4 d6 7.Nge2 b5!? undermining White's strong center pawns. 8.Ng3 bxc4 9.Bxc4 Bxc3+ 10.bxc3 Qa5 11.Ne2 Ba6 12.Bxa6 Qxa6 13.dxe6 fxe6 14.Nf4 Re8 I sensed that this was a critical moment. If Black is given the chance to develop normally and place his pieces to good squares such as Nc6/d7-e5, Rad8 Black will have a better position. Therefore, I decided to disturb his equilibrium on the board and on his mind! 15.g4! threatening to harass the f6N and his kingside with g4-g5. 15...d5?! I thought it was interesting to sacrifice a pawn to grab the initiative with [15...Nc6 16.g5 Nd7 17.Qxd6 Nde5 18.Qd1 Rad8 19.Qe2 Nd3+ 20.Nxd3 Qxd3 and Black has more than enough compensation for the pawn.] 16.g5 Nfd7 17.exd5 exd5+ 18.Kf2 Nb6 19.Nxd5 Qb7 20.Nf6+!? opening lines of attack and taking advantage of Black's sleeping pieces on the queenside. 20...gxf6 21.gxf6 Qf7 22.Rg1+ Kh8 23.Bh6 N8d7 24.Bg7+ Kg8 25.Bf8+ Kh8 26.Bg7+ Kg8 unfortunately White doesn't have enough resources to get anything more than a draw. 27.f4 the perpetual check won't go away. 27...Rad8 28.Bf8+ Kh8 [28...Kxf8?? 29.Qd6+ Re7 30.fxe7+ Qxe7 31.Rg8+! Kf7 32.Rg7+ Kxg7 33.Qxe7++- ] 29.Bg7+ [29.Rg7 Rxf8 30.Rxf7 Rxf7 is risky for White.] 29...Kg8= and a draw was agreed due to three-fold repetition. 1/2-1/2