Illustrative Game 1
GM Leonid Yudasin- GM Ilia Smirin
Leningrad 1990

1.e4 c5 2.Nf3 Nc6 3.b3 d6 4.Bb5 Nf6 5.Qe2 e5 6.c3 Be7 7.d4 cxd4 8.cxd4 O-O 9.Bxc6 bxc6 10.dxe5 dxe5 11.O-O
White stands somewhat better because of Black's weak pawns.  Note that 11.Nxe5 is met by 11...Qd4.
11...a5 12.Rd1 Qc7 13.Bb2 Nd7 14.Nc3 Nc5?! 15.Na4! Nxa4 16.Bxe5 Qb6 17.bxa4 c5 18.Rab1 Qg6 19.Bc3 Bg4 20.Qe3 Qa6 21.Rb5
Winning another pawn.  Black's only chance is tactical counterplay.
21...Rfd8 22.Rdb1 Qe6 23.Bxa5 Re8 24.a3 Bf8 25.Nd2 Qa6 26.Nb3?
A time-trouble error.  Better is 26.Nc4.  If then 26...Bd7, White can sacrifice the Exchange as his passed pawns would give him the win.
26...c4 27. Nc5 Qc6 28.f3 Bc8 29.Qd4 Ba6 30.Nxa6 Rxa6 31.Kf1 Rc8
Now there are dangerous tactics on the g1-a7 diagonal.  White must also be wary of Black's c-pawn.  Both sides were in severe time pressure.
32.Qc3 Qd6 33.g3 Qd7 34.Kg2 Rh6 35.h4 Rd6 36.Rb8 Rd3 37. Qe5 c3 38.Rxc8 Rd2+ 39.Kg1 Qxc8 40. Qxc3?
The last move of time control is a serious error.  40.Rb8 would have won:
a) 40...Qh3 41.Rxf8+ Kxf8 42.Bb4+ Kg8 43.Qe8#.
b) 40...Rd1+ 41.Kf2 Qxb8 42.Qxb8 c2 43.Bb4 h6 44.Qxf8+ Kh7 45.Bc3.
Black returns the favor.  40...Qh3 wins as 41.Qxd2 is met by 41...Bc5+ 42.Qf2 Qxg3+.
41.Kf1 Qh3+ 42.Ke1 Rd8 43. Bxd8 1-0

Illustrative Game 2
NM Guenther Nindl - GM John Nunn
Vienna 1986

1.e4 c5 2.b3 d6 3.Bb2 e5 4.Bb5+ Nc6 5.Nf3 Nf6 6.Bxc6+ bxc6 7.d3 g6 8.O-O Bg7 9.Ne1 O-O 10.f4?
Better is 10.Nd2.
10...Bg4 11.Qd2
If 11.Qc1, then 11...Bh6 gives Black a big advantage.
11...exf4 12.Rxf4 Nxe4
Revealing the weakness of White's lack of development on the Queenside.
13.Rxe4 Bxb2 14. Rxg4 Bxa1 15.c3
White's only hope is to trap the Bishop.  However, Black has everything worked out.
15...Re8 16.Nc2 Bb2 17. Ne3 Qe7 18.Rg3 Ba1 19.Rf3
If 19.Nc2, then 19...Qe2 20.Nxa1 Qxd2 21.Nxd2 Re1+.
In order to meet 20.Nc2 with 20...Bb2 21.Ne3 d4.
20.Kf1 d4 21.Ng4 f5 22.Nh6+ Kg7 23.c4 Rf8 24.g3 Rae8 0-1
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