La variante del cambio de la Defensa Gruenfeld con 14.d5

 Kovacevic,Antonijo (2359) - Da Costa Júnior,Luiz Roberto (2359) [D89]
IECG-SH-2007-079-corr., 2007
[Da Costa Júnior, L.]

1.d4 Cf6 2.c4 g6 3.Cc3 d5 4.cxd5 Cxd5 5.e4 Cxc3 6.bxc3 Ag7 7.Ac4 0-0 8.Ce2 c5 9.Ae3 Cc6 10.0-0 Ag4 11.f3 Ca5 12.Ad3 cxd4 13.cxd4 Ae6 14.d5 [14.Tc1 Axa2 15.Da4 Ab3 16.Db4 b6 17.Ag5 f6 18.Ad2!? (18.Af4 e5 19.Ae3 exd4 20.Cxd4 Af7 21.Aa6 Te8 22.Cb5!?© (22.Tfd1 De7=/+ Kramnik - Shirov, Cazorla (m/1) 1998) ; 18.Ah4 Dd6 (18...Af7 19.Ag3 e5 20.Aa6 b5 21.Af2 Cb3 22.Tc6 exd4 23.Cxd4 Cxd4 24.Axd4 Ac4 25.Td1 Tb8 26.De1 Dd7!? 27.Txc4 bxc4 28.Axc4+ Rh8 29.Ac5 Dc6 30.Axf8 Axf8= ) 19.Dxd6 exd6=/+ Kramnik - Shirov, Cazorla (m/5) 1998) 18...Dd6 19.Dxd6 exd6 20.Ab4= ]

14...Axa1 15.Dxa1 f6 16.Ah6 [16.Tb1 Ad7 17.Ah6 Tf7 18.e5 Ac6 19.e6 Tg7 20.dxc6 Dxd3 21.cxb7 Cxb7 22.Axg7 (22.Txb7? Dxe2 23.Db1 Dxe6-/+ ; 22.Cd4 Cd6= ) 22...Dxe2 23.Axf6 (23.Ah6 /\ Te1) 23...exf6 24.Txb7 Tc8 25.Rh1!= (25.h4? Tc2-+ ) ]

16...Te8 17.Rh1 Tc8 [17...Ad7?! 18.e5 Tc8 19.Cg3! Cc4 (19...Aa4 20.Ce4 Dxd5 21.exf6 e5 22.Cg5 Tc7 23.Db1+- ) 20.Axc4 Txc4 21.Ce4 Db6 22.Td1 Txe4 23.fxe4 fxe5 24.Dxe5 Df6 25.Dg3+/- Nielsen - McShane, Malmo/Kobenhavn 2003]

18.Cf4 Ad7 19.e5 Cc4 20.e6 Aa4 21.Cxg6! hxg6 22.Axg6 Ce5 23.Ae4! Ac2! [23...Da5 (Christiansen - Korchnoi, Reggio Emilia 1987/88) 24.Db2! Ac2[] 25.Axc2 Dc3 26.Dxc3 Txc3 27.Ae4+/= ^^]

24.Axc2 Txc2 25.Dd1 Rh7 [25...Tc5? 26.f4 Dxd5 (26...Txd5 27.Dh5 Rh7 28.fxe5 Txe5 29.Ag5++- ) 27.Dh5 Tc2 28.Tg1 Dxe6 29.Dxe8+ Rh7 30.Df8+- Van Wely - Kovchan, Moscú 2003; 25...Dc7!? 26.f4 Tc1 27.Dxc1 Dxc1 28.Txc1 Cg4 29.h3 Cxh6 30.g4 Td8 31.Tc7 Rf8= Kobalia - Zakhartsov, San Petersburgo 2001]

26.f4! Dc8 [26...Rxh6 27.fxe5 (C. Hansen - McShane, Malmo/Kobenhavn 2003) 27...Dc7! 28.d6 (28.exf6 Tf8 29.f7 Dc4!= ) 28...Dc4! 29.exf6 De4!= ]

27.fxe5 Rxh6!N [27...Dc4? 28.Ad2!!+- Prusikhin - E. Hermansson, Budapeste 2003]

28.exf6 Dc4!? 29.f7 [29.d6 De4! 30.Tf3 Dc6 31.Th3+ Rg5 32.Th5+ (32.Df1 Tc1 33.Tg3+ Rh6= ) 32...Rxf6 33.Dd4+ Rxe6 34.Th6+ Rf5 35.Th5+ Re6= ]

29...Tf8 30.d6 exd6 31.e7 [31.Tg1 Te2 32.Dxd6 Rg7 33.Dg3+ Rh7 34.Dh3+ Rg7= ]

31...Txf7 32.Dxd6+ Rh7 33.Txf7+ Dxf7 34.Dd3+ Rh6= [Da Costa Júnior] 1/2-1/2

4 de Mayo del 2007
Da Costa Júnior