Pawn and Two: An historic game. The annotation states this was the first tournament game won by a computer over a master.
<jerseybob> At move 28, Fritz indicates White has a choice of several winning continuations.
Here are Fritz's top three choices: (10.29) (21 ply) 28.c4 Bd7 29.cxd5 exd5 30.Bxd5; (8.03) (20 ply) 28.Rf1 Kc7 29.Qe5+ Kd7 30.Qg5 Kc6 31.e4; (7.22) (20 ply) 28.Qg5 Kc7 29.Rf1 Qd8 30.Rf7.
Sentef's choice 28.Bf3 was also winning: (5.63) (20 ply) 28.Bf3 Kc7 29.c4 Bd7 30.cxd5+.
At move 30, the game score appears to be incorrect. Sentef's 30.Bg2?? allows 30...Nxf6. It seems unlikely that Sentef would have missed this, and certainly Cray Blitz would not have missed taking the queen.
I think it is probable that instead of 30.Bg2??, Sentef actual played 30.Qg5, then the game continuation of 30...Qe7 31.Qg6 is logical.
At move 34, Sentef had clear winning continuations with: (3.15) (18 ply) 34.Bg2 Bd7 35.Qb1 Re8 36.Qb4+ Kc7 37.Qxb7+, or (2.83) (18 ply) 34.c4 Bd7 35.c5+ Kc7 36.d5 Rdd8 37.d6+.
Instead of these winning continuations, Sentef played for simplification, and gave up most of his advantage: 34.Qg3? Qxg3 35.hxg3 Bd7 36.Rf8 Rc8, (.46) (23 ply) 37.Bh7 Rxc3 38.Rxg8 Rxg3+ 39.Kf2
At move 37, an alternative move 37.Rxc8 leads to a draw after: (.96) (23 ply) 37.Rxc8 Bxc8 38.Bh7 Ne7 39.Kf2 e5 40.g8Q Nxg8 41.Bxg8, (.81) (24 ply) 41...exd4! 42.cxd4 b5 43.Kf3 a5 44.g4 a4 45.g5 b4 46.Ke4 b3 47.Bxb3 axb3.
Cray Blitz could have made a draw clear with: (.06) (21 ply) 40...e5 41.Bxb7 Be6 42.Rd8+ Ke7 43.Ra8 exd4 44.Rxa7 Kf6.
Instead, after 40...b6, White has a little advantage in the following interesting line: 41.Ke3 e5, (.48) (20 ply) 42.Bf5! Rxf5 43.Rd8 exd4+ 44.Kxd4 Rd5+ 45.Kc3 Rc5+ 46.Kb2 Rb5 47.Ka1 Rg5 48.g8Q Rxg8 49.Rxg8, and this ending should be a draw.
Instead of 42.Bf5!, Sentef played 42.Ra8, giving Black a slight advantage. At move 43, Sentef could have played to trade off Black's last pawn, with a likely draw by: 43.Bf3! exd4+ 44.Kxd4 Be6 45.Rxa7 Rxf3 46.a4, (-.25) (22 ply) 46...Rf4+ 47.Ke3 Rg4 48.Ra6 Rxg7 49.Rxb6+.
Instead of 43.Bf3!, Sentef erred with 43.Kf2?. After 43.Kf2? Rxg7 44.dxe5+ Kxe5 45.Bf3 Be6, White still had drawing chances with 46.Re8! (-1.29) (23 ply) 19...Kf6 20.Rf8+, or (-1.22) (23 ply) 19...Kd6 20.a3. Additional analysis is needed to determine if White can draw after 46.Re8!.
After 46.a4? Rf7! 47.Ke3?, Sentef was clearly lost. At move 47, White's best try is 47.Re8 Kd6 48.Ke3 Bd7 49.Rg8 Bxa4, but Black is winning in this position.